Restore Page
  • 1700UTC 28Sep2016: As of 1400Z 27Sep2016 (2016271), the GOES-14 Imager and Sounder instruments were deactivated. GOES-14 is now in on-orbit storage.. (jim.nelson@ssec.wisc.edu)

  • 0234UTC 03Aug2016: As of 2000Z 02Aug2016 (2016215), select GOES-14 Sounder imagery and products are again available here. GOES-14 Sounder Total Precipitable Water, Lifted Index and Cloud Top Pressure Derived Product Imagery (DPI) should be available by the end of this week. (jim.nelson@ssec.wisc.edu)

  • 2316UTC 30Jan2016: GOES-14 Sounder products are now available on the GOES Sounder Page. See also CIMSS ADDE G14 products for availability of CIMSS GOES-14 Sounder Derived Product Image (DPI) areafiles and (SRET-schema) retrieval MD file data. (jim.nelson@ssec.wisc.edu)

  • 1731UTC 20Nov2015: At approximately 0922UTC 20Nov2015, the GOES-13 Sounder experienced an anomaly. All GOES-13 Sounder imagery and related products are affected. For further details, please see CIMSS Satellite Blog entry. (jim.nelson@ssec.wisc.edu)

  • 1800UTC 26Jun2015: Removed CIMSSP1 ADDE group from all_cimss_adde_datasets (jim.nelson@ssec.wisc.edu)

  • 0331UTC 17Jun2015: Software updates re-enabled remaining looping capabilities that had been broken (jim.nelson@ssec.wisc.edu)

  • 1906UTC 28May2015: Software updates re-enabled most of the looping capabilities that had been broken (jim.nelson@ssec.wisc.edu)

  • 1742UTC 28Apr2014: Added listing of storm report totals by state to the GOES Sounder Precipitable Water and Lifted Index Derived Product Imagery. (jim.nelson@ssec.wisc.edu)

  • 2014UTC 09Apr2014: Update: At CIMSS, a new computer for GOES research and production continues to be brought on-line. Over time, most of the GOES Sounder and Imager products seen at http://cimss.ssec.wisc.edu/goes/rt will get produced on the new system, and turned off on various older systems. Another change that will be seen is a migration of products from the CIMSSP1, CIMSSP2, CIMSSP3 and CIMSSP7 ADDE datasets to a new CIMSSP ADDE dataset all_cimss_adde_datasets. We again apologize for any inconvience encountered during this time of transition. (jim.nelson@ssec.wisc.edu)

  • 1825UTC 16Oct2013: At CIMSS, a new computer for GOES research and production is being brought on-line. Over time, all of the GOES Sounder and Imager products seen at http://cimss.ssec.wisc.edu/goes/rt will get produced on the new system, and turned off on various older systems. Another change that will be seen is a migration of products from the CIMSSP1, CIMSSP2, CIMSSP3 and CIMSSP7 ADDE datasets to a new CIMSSP ADDE dataset all_cimss_adde_datasets. We apologize for any inconvience encountered during this time of transition. (jim.nelson@ssec.wisc.edu)

  • 2052UTC 05Sep2013: On the Sounder DPI Page (http://cimss.ssec.wisc.edu/goes/rt/sounder-dpi.php), as of 05Sep2013, severe wind gust locations are also being plotted, in addition to wind damage locations. This affects the plots of severe weather over Precipitable Water and Lifted Index. (jim.nelson@ssec.wisc.edu)

  • 1820UTC 24Oct2012: On the Sounder DPI Page (http://cimss.ssec.wisc.edu/goes/rt/sounder-dpi.php), as of the 16UTC processing on 24Oct2012, GOES-E (13) Sounder bands 13(4.57um) and 14(4.52um) have been disabled within the temperature/moisture retrieval processing, due to excessive noise. The affected products (e.g., Total Precipitable Water (TPW)) should now appear smoother. (jim.nelson@ssec.wisc.edu)

  • 1825UTC 15Oct2012: On the Sounder DPI Page (http://cimss.ssec.wisc.edu/goes/rt/sounder-dpi.php), products denoted as "GOES-14" were replaced with "GOES-13" on or about 11Oct2012, in support of (2) 24-hour tests of the GOES-13 Imager and Sounder (http://www.ssd.noaa.gov/PS/SATS/messages.html). As of 1546UTC 15Oct2012, the GOES-13 Sounder products are again being produced in support of the 2nd 24-hour test, and will continue until 1546UTC 16Oct2012. (jim.nelson@ssec.wisc.edu)

  • 1536UTC 24Sep2012: As many of you already know, the GOES-13 (East) satellite experienced an anomaly this past weekend, causing an interruption in both the Imager and Sounder data NESDIS GOES Operations Special Bulletins. Fortunately, the GOES-14 satellite (at 105W), that had been operating in experimental 1-minute scanning mode, was able to be switched to mimic the GOES-13 schedule. As of the 15Z imagery on 24Sep2012, SSEC began routing GOES-14 Imager and Sounder data through the (idle) GOES-13 ADDE datasets. There may yet be a few software "hiccups," but users should soon start seeing improved coverage over the eastern U.S. (jim.nelson@ssec.wisc.edu)

  • 2150UTC 06Sep2012: Starting with the 18UTC processing on 05Sep2012 (249), the program used to generate GOES Sounder retrievals was updated, and GOES-East (13) Sounder bands 13 (4.57um), 14 (4.52um) and 15 (4.45um) were removed from the retrieval processing, due to excessive noise issues. This resulted in better Derived Product Imagery (DPI). However, a bug still remained, which ruined the GOES Sounder DPI imagery from sunset on 05Sep2012 to sunrise on 06Sep2012. The bug has now been repaired. We apologize for any inconvenience this has caused. So as of 2150UTC, 06Sep2012: NORMAL processing. (jim.nelson@ssec.wisc.edu)

  • 2122UTC, 04Sep2012: JPN updated the locations of several GOES Sounder retrieval-related ASCII data files (see: http://cimss.ssec.wisc.edu/goes/rt/sounder-dpi.php). The "...Precipitable water and stability indices" link now points to ASCII files generated by the Li et al.(2008) retrieval algorithm, as opposed to ASCII files generated by the Ma et al.(1999) algorithm. The "...retrieval vertical temperature and moisture profiles" link now also points to ASCII files generated by the same Li et al.(2008) algorithm. Thank you. Please contact: jim.nelson@ssec.wisc.edu for any questions.

  • 2033UTC, 27Aug2012: Starting approximately 20Aug2012, select GOES-14 Sounder products were inserted into the Realtime GOES Sounder Web page. These Sounder products are available as a side-benefit of experimental 1-minute GOES-14 Imager data, that is expected to continue until 31Oct2012 (GOES-14 Experimental 1-minute Imager data).

  • 2302UTC, 12Apr2012: Starting about 04Apr2012, all GOES Sounder temperature and moisture products were updated within a 2-3 day period to be those products generated by a physical retrieval algorithm described in Li et al(2008). Previously, the same products were produced by an algorithm described in Ma et al(1999). The GOES Sounder cloud products were not affected by these changes. Please contact: jim.nelson@ssec.wisc.edu for any questions. References: Li, Zhenglong; Li, Jun; Menzel, W. Paul; Schmit, Timothy J.; Nelson, James P. III; Daniels, Jaime and Ackerman, Steven A. GOES sounding improvement and applications to severe storm nowcasting. Geophysical Research Letters, Volume 35, Issue 3, 2008, doi:10.1029/2007GL032797. Reprint #5677. Ma, Xia L.; Schmit, Timothy J. and Smith, William L. A nonlinear physical retrieval algorithm - Its application to the GOES-8/9 sounder. Journal of Applied Meteorology, Volume 38, Issue 5, 1999, pp.501-513. Reprint #2580.

  • 1855UTC, 06Dec2011: Earlier today, GOES-15 replaced GOES-11 as the operational NOAA west geostationary satellite (http://www.noaanews.noaa.gov/stories2011/20111206_goessatellite.html). At CIMSS, the transition from GOES-11 to GOES-15 was essentially completed as of the 18Z products. Please contact: jim.nelson@ssec.wisc.edu for any questions.

  • 0353UTC, 23Nov2011: On 22Nov2011, GOES-12 Sounder South America processing at CIMSS was modified. The following ADDE imagery datasets are no longer available: CIMSSP3/1X1_MCE_SALI, 1X1_MCE_SATP, 1X1_MCE_SAPW, 1X1_MCE_SACE and 1X1_MCE_SAEC. Please use the alternate datasets containing S1, S2, S3 and S4 in their names. If there is any confusion, please contact: jim.nelson@ssec.wisc.edu We apologize for any inconvenience caused by these changes.

  • 0049UTC, 09Sep2011: At approximately 20UTC on 07Sep2011, GOES-15 processing was completely restored, and select imagery was available at http://cimss.ssec.wisc.edu/goes/rt/sounder-dpi.php. (jim.nelson@ssec.wisc.edu)

  • 1650UTC, 27Oct2010: As of approximately 16UTC on 25Oct2010, GOES-15 stopped sending both Imager and Sounder data, and will be placed into on-orbit storage mode. (jim.nelson@ssec.wisc.edu)

  • 0600UTC, 23Oct2010: As of the 05UTC processing on 23Oct2010, it is hoped that the main problem affecting GOES Sounder retrieval TPW, LI and CAPE products for the last several days has been fixed. These 3 products should now be useable, but the corrective actions performed will result in these 3 products not being optimal for several more days, as a database must be rebuilt. We apologize for any inconvenience this may have caused to our users, and we thank you for your patience. (jim.nelson@ssec.wisc.edu)

  • 19-Oct-2010, 0420UTC: As of the 04UTC processing on 19Oct2010, the GOES retrieval program that generates most of the GOES Sounder products was updated to a new version (rev 10p2). There was some trouble prior to the 04UTC processing, unfortunately. Products at both the "Sounder DPI" and "GOES-12@60W(S. America)" links were affected. (jim.nelson@ssec.wisc.edu)

  • 19-Jul-2010, 1617UTC: As of approximately 1545UTC on 19Jul2010, a number of GOES-15 Sounder products were activated at: http://cimss.ssec.wisc.edu/goes/rt/sounder-dpi.php For further information on the upcoming GOES-15 Science Test, please see: http://rammb.cira.colostate.edu/projects/goes-p/ (jim.nelson@ssec.wisc.edu)

  • 24-May-2010: GOES-12 @ 60W (South America) page with products added

  • 14-Apr-2010, 1900UTC: As of approximately 1900UTC on 14Apr2010, the GOES-12 Imager and Sounder instruments were replaced operationally with their counterparts on GOES-13. For further information, please see: http://www.ssd.noaa.gov/PS/SATS/MESS/MSG0901618.01.txt (jim.nelson@ssec.wisc.edu)

  • 19-Jan-2010, 1900UTC: As of approximately 0000UTC on 19Jan2010, the GOES-14 Imager and Sounder instruments were deactivated. The GOES-14 Science Test was conducted from 30Nov2009 -> 04Jan2010, but the Imager and Sounder instruments were left on-line until very early today (http://www.ssd.noaa.gov/PS/SATS/) (jim.nelson@ssec.wisc.edu)

  • 04-Dec-2009, 2000UTC: Added the following 3 GOES-14 Sounder displays: 1.) GOES-14 All band display, 2.) GOES-14 band-8 Conterminous US Single Band Composite Image, 3.) same as #2, but for GOES-14 band-19. (jim.nelson@ssec.wisc.edu)

  • 25-Nov-2009, 0050UTC: Changed GOES Sounder ozone imagery to cover the same "Full" region as the other Full region products, and now also display ozone imagery from a much more recent (Li et al. 2007) algorithm than previously; updated the former GOES-13 ("central" region) Sounder imagery to now contain GOES-14 Sounder imagery, in preparation for the upcoming 30Nov09 - 04Jan10 GOES-14 Science Test. (jim.nelson@ssec.wisc.edu)

  • 23-Jul-2009, 1731UTC: Updated all GOES Sounder Single Band Composite Imagery to cover a region *identical* to the other Conterminous U.S. Sounder DPI imagery, to aid comparisons; repaired access to the corresponding CIMSSP2/GCxx composite imagery ADDE datsets, and added calibration to this data. (jim.nelson@ssec.wisc.edu)

  • 22-Jun-2009, 1655UTC: Now display GOES Sounder retrieval DPI imagery of low-layer (approximately 1000-900mb), mid-layer (900-700) and upper-layer (700-300) precipitable water as separate radio buttons. Removed obsolete button that formerly dealt with this imagery. (jim.nelson@ssec.wisc.edu)

  • 05-May-2009, 1600UTC: Updated GOES Sounder retrieval software to be a more current version. This should have a limited effect on Sounder DPI Imagery of Precipitable Water, Lifted Index and CAPE (all regions), seen especially by the elimination of occasional line hits. The corresponding GOES Sounder retrieval ASCII data files will also be affected in a limited sense. (jim.nelson@ssec.wisc.edu)

  • 06-Feb-2009, 1630UTC: Changed GOES Sounder cloudtop data available via the CIMSSP1 ADDE group to now be DPI imagery and point data derived from a 101-level atmosphere (the old imagery was derived using a 40-level atmosphere). This involves image descriptors GACTP, GAECA, GECTP, GEECA, GPCTP, GPECA, GWCTP, GWECA, GCCTP and GCECA, as well as point descriptor GCLD. (jim.nelson@ssec.wisc.edu, tony.schreiner@ssec.wisc.edu)

  • 22-Dec-2008, 20UTC: Disabled all access to the (now obsolete) ADDE group CIMSSPE. (jim.nelson@ssec.wisc.edu)

  • 30-Oct-2008, 18UTC: Changed the Radiative Transfer Model (RTM) coefficient files being used by all clouds and retrieval processing, to use more current files. Any changes noticed should not be major. (jim.nelson@ssec.wisc.edu)

  • 24-Sept-2008: Changed the domain coverage of the Sounder DPI "Precipitable Water: Combined GOES-East/West Coverage" -- see: http://cimss.ssec.wisc.edu/goes/rt/viewdata.php?product=pwa_sn

  • 16-Sept-2008: Disabled the computer containing the CIMSSP ADDE group -- for substitute datasets to use, please see http://cimss.ssec.wisc.edu/goes/rt/substitute_cimssp_adde_datasets

  • 9-July-2008: Added Band 19 GOES E/W Single Band Composite imagery

  • 23-June-2008: Added several CAPE and LI Derived Product Imagery (DPI) datasets (produced using Ma et al. (1999) algorithm) to ADDE group CIMSSP2; added GOES-E CONUS CAPE and LI DPI datasets (produced using Li et al. (2008) algorithm) to CIMSSP3 http://cimss.ssec.wisc.edu/goes/rt/all_cimss_adde_datasets

  • 18-June-2008: Moved Effective Cloud Amount (ECA) and Cloudtop Pressure (CTP) Derived Product Imagery (DPI) datasets from ADDE group CIMSSP to group CIMSSP1 http://cimss.ssec.wisc.edu/goes/rt/all_cimss_adde_datasets

  • 5-March-2008: Animated GIFs for select GOES-10 products added (as designated on the GOES-10 page)

  • 6-July-2007: Links to GOES-10 sounder ASCII data files added

  • 20-June-2007: GOES-10 Total Precipitable Water - Combined Sectors added

  • 29-May-2007: GOES-10 Band 19 and Precipitable Water added

  • 26-Feb-2007: GOES-10 combined sector imagery added

  • 31-Jan-2007: GOES-10 page with new imagery and products added

  • 31-Jan-2007: Website reorganized / improved.

  • 12 Jan 2007: GOES-10 South America imagery added

  • 18 Dec 2006: GOES-13 products (Precipitable Water, Lifted Index, Cloud Top Pressure) added for GOES-13 Science Test

  • 14 Dec 2006: Website has been completely redesigned and has moved to a new URL: http://cimss.ssec.wisc.edu/goes/rt/

  • 23 Dec 2005: Display of the Effective Cloud Amount (ECA) DPI, over the US, has been added to the cloud portion of the page, complementing the Cloud Top Pressure (CTP) DPI.

  • 18 Nov 2005: No longer will any current GOES-9 Sounder DPI (PW or CTP) be shown on this page, as the new Japanese satellite MTSAT-1R is now on station over the far Pacific, at longitude 140 East, and the services of GOES-9 are no longer required. MTSAT-1R has an imager, but no sounding instrument.

  • 01 Nov 2005: Success in convergence to one NOAA/NESDIS software package for GOES Sounder retrievals was evident by: (1) provision of the GOES (new) SFOV DPI, by OSDPD, to the NWS AWIPS (Advanced Weather Interactive Processing System), in place of the previous 5x5 FOV DPI and (2) the beginning of the transition of the DPI shown on the CIMSS page to be from the "merged package" rather than the CIMSS "legacy" code. The DPI transition on the CIMSS web page started with the Wisconsin region display . The transition at CIMSS was also confounded by the simultaneous effort to cease processing on the machine "vern" (an IBM RISC box running AIX) and transfer all generation to a suite of fast Dell PowerEdges running linux (and named: "edward" and "rets1" to "rets3").

  • 12 May 2005: Progress to convergence to one NOAA/NESDIS software package for the physical GOES sounder retrieval algorithm continued, as all 3 sites ("ops", FPDT, and CIMSS) were well on the way in attempting to run the one "merged package" system in each of their facilities. So called, due to the generation of both profile and cloud retrievals in the same code, the "merged package" was tuned and modified following discussion and interaction amongst the groups, as they verified and compared their SFOV DPI as shown in real-time animations on this web page. [Comparison scripts were of the naming: makdpicomn??.scr.]

  • 08 Nov 2004: The process to convergence to one NOAA/NESDIS software package for the physical GOES sounder retrieval algorithm can be monitored on the CIMSS Realtime GOES Page. Links at the end of the page provide 4-panel comparison displays of GOES Sounder SFOV DPI of precipitable water, lifted index (stability), and cloud top pressure from 4 sources:
        upper left - latest SFOV version from "ops" (OSDPD)
        upper right - current "operational" 5x5 FOV DPI (as on AWIPS)
        lower left - latest SFOV version from ORA/FPDT
        lower right - latest SFOV version from CIMSS (ORA/ASPT)
    Standard radiance imagery from the Imager is also included for comparison. [Comparison scripts were of the naming: makdpicomp??.scr.]

  • 09 Mar 2004: The retrieval processing machine named "suomi", used primarily for the standard 3x3 field-of-view (FOV) GOES Sounder retrievals and DPI, failed on 8 Mar 2004. The previous suite of GOES products shown on this page was a mix of 3x3 data as well as single FOV (SFOV) data (generated on the machine "vern"). The conversion to display of solely the newer SFOV GOES Sounder products has begun.

  • 30 Jan 2004: The SSEC/CIMSS web server (aka cimss.ssec.wisc.edu) was replaced on 30 Jan 2004 by a faster and more secure machine. Links were kept the same as before.

  • 22 May 2003: Beyond the hourly displays of all spectral bands from the GOES-9 Sounder (see note for 12 May 2003), a "3 GOES wide" display, across mid lattitudes, from Japan to Maine, has been added for the total precipitable water DPI. In addition, Sounder band 11 (H2O at 7.0 um) and band 4 (C02 at 13.7 um) are also shown across that region, with matching color enhancements, to comparatively illustrate the moisture and thermal patterns evident in the clear-air mid troposhere.

  • 12 May 2003: Following GOES-9 replacement of GMS as the operational geostationary satellite over the far Pacific (at 155 E) during the spring of 2003, hourly displays of all spectral bands from the GOES-9 Sounder are now routinely available. Note that GOES-9 Sounder coverage consists of three sectors: north, including central Japan; central, or equatorial, including Papua New Guinea; and south, including eastern Australia. The central and south sectors occur once every six hours (nominally at 04, 10, 16, and 22 UT; and at 02, 08, 14, and 20 UT, respectively) with all the remaining 16 hours being for the north sector.

  • 24 Apr 2003: Hemispheric Cloud Top Pressure (CTP) and Effective Cloud Amount (ECA) DPI from the GOES-12 Imager have been added to the suite of GOES Imager based products displayed on this page. These cloud products utilize the unique 13.3 C02 absorption channel (Imager band 6) available on GOES-12. Other Imager products already shown here are the Clear Sky Brightness Temperature ( CSBT ) DPI from GOES-10 (west) and -12 (east).

  • 18 Apr 2003: The GOES Sounder retrieved profiles and Derived Product Imagery (DPI) generated here at CIMSS, at 3x3 field-of-view (FOV) horizontal resolution, are now using forecast fields from the NCEP AVN model as the first-guess. Previously, the NCEP Eta model had been used. The CIMSS single FOV (SFOV) retrievals and DPI, started last spring (2002) for the IHOP experiment, were originally, and continue to be, made with an AVN first-guess. At 18 UT on 17 April 2003, the switch over occurred for the 3x3 DPI. The effect of the changing first-guess was evident at that time in the total precipitable water (PW) DPI, from very dry conditions in SE Canada to more tropical moisture settings across the Gulf of Mexico and around the West Indies, and reaching into the SE US. Now, use of a common first-guess (AVN) permits more readily straightforward comparison of the difference between the 3x3 FOV and single FOV DPI.

    Tests were performed by G. Gray and J. Daniels at NOAA/NESDIS/ORA/ARAD/FPDT that showed statistically improved GOES retrievals were made using the AVN model, versus the Eta model. It appears that the temperature forecast from the AVN model is slightly better (the moisture forecast, slightly poorer) than that from the Eta model. Thus, as the physical GOES retrieval algorithm allows much larger changes [also read as "improvements"] to the moisture profile (versus the temperature profile), the better first-guess temperature data (i.e. from the AVN) are preferred. Operational GOES retrieval processing at NOAA/NESDIS/OSDPD/SSD also uses the AVN model as the first-guess.

    [N.B. The AVN model is currently undergoing a name change to the GFS (Global Forecast System).]

  • 01 Apr 2003: GOES-12 replaced GOES-8 as the operational GOES-East satellite, beginning with the 18:20 UT (Atl) and 1846 (EUS) Sounder sectors. As initially demonstrated during the GOES-12 Science Test , GOES-12 remains noticeably much cleaner than GOES-8 and more consistent with GOES-10 (in the west), particularly in non-window channels.

  • 01 Apr 2003: Regression based Sea Surface Temperature (SST) images, derived from GOES-8 Imager radiances, were generated routinely at CIMSS for many years and shown on the web since 1997. However, this research demonstration ended on 1 April 2003, when GOES-12 replaced GOES-8 as the operational GOES-East satellite. The regression relationship for GOES-8 was based on use of the 11.5-12.5 micrometer "split window" channel (band 5). GOES-12 does not have such a channel, but rather one at 13.3 micrometer, invalidating continued demonstration of the "split window" application. The operational production of SST imagery from current GOES satellites is now provided by NOAA/NESDIS/ORA/ORAD within the CoastWatch program.

  • 26 Feb 2003: From both GOES-East and -West Imager observations, a cloud detection algorithm is used hourly to generate the Clear Sky Brightness Temperatures (CSBT) for all the Imager spectral bands. These cloud-free "clear sky" values, at about 50 km horizontal resolution, are provided to NCEP and ECMWF for assimilation into global numerical prediction models. A subset of this CSBT data is presented on the web in an image format, specifically showing the hemispheric coverage every three hours for the upper tropospheric moisture channel (#3) on the GOES Imager (at 6.7 um).

  • 12 Aug 2002: Following the completion of support for two recent field campaigns (over the Southern US Plains during late spring 2002 for IHOP and over Florida during early summer 2002 for CRYSTAL), the focus for a more detailed, more mesoscale oriented display of GOES SFOV DPI was shifted to the "local" Wisconsin region. Java applets provide for easy animation and toggling of the DPI as well as overlays of first-guess fields and radiosonde values.

  • 25 Apr 2002: In support of the IHOP 2002 spring field campaign in the south central US, CIMSS has implemented and continues to assess the generation of GOES Sounder retrievals and DPI at full spatial, or, also known as single field-of-view (SFOV), resolution. On the CIMSS Realtime GOES IHOP Page , SFOV DPI are shown over the last six hours, focussing on the Oklamoma, Kansas, and Texas Panhandle region. In addition, simultaneous animation loops of the SFOV DPI are presented for larger scale views in the routine portion of the GOES DPI displays. The new SFOV retrievals are generated on the "vern" computer, using an AVN model first-guess; the 3x3 FOV retrievals are generated on the "suomi" computer, using an Eta model first-guess. (Currently, gif file displays of the SFOV DPI include an "A", for the guess type, as a distinguishing marker). In late March 2002, some of the SFOV DPI were beginning to be first posted on these web pages.

  • 04 Dec 2001: A technique to identify snow during the daytime has been developed which uses the visible band and radiance information from the Geostationary Operational Environmental Satellite (GOES) Sounder shortwave bands. It was tested over the 2000/2001 winter and 2001 summer and, as of the nominal 19:00 UTC Cloud Product data set on 03 December 2001, has been incorporated into the current GOES Sounder cloud mask at the Cooperative Institute for Meteorological Satellite Studies (CIMSS). An example of the cloud product using the routine (RTN) cloud masking algorithm versus the new (SNW) algorithm is shown for a late 2000/2001 winter case (at 19:46 UTC on 23 April 2001). The skies were indeed clear over the band extending from northwestern Nebraska through the eastern two-thirds of South Dakota and the extreme southeastern portion of North Dakota into western Minnesota. The improperly assigned cloud heights found in the RTN version of the Cloud Top Pressure (CTP) are in fact clear, snow-covered ground areas resulting from passage of the 22 April 2001 storm.

  • 28 Aug 2001: Plots of recent severe weather reports over GOES Sounder Lifted Index (LI) or Precipitable Water (PW) DPI from the previous afternoon or evening have been added to provide a simple, quick look at the correlation that exists between the GOES derived atmospheric stability or moisture fields and later ensuing severe weather. [The initial work on this display was done by NASA SHARP student C. Nosal (Pensacola, FL) who was sponsored by CIMSS staff (G.M. Bayler; G.S. Wade) during the summer of 2001.]

  • 15 May 2001: Plotted differences between the GOES Sounder retrievals and their first-guess values have been expanded to include the 850 mb dewpoint, 850 mb temperature, and the 500 mb temperature values. These sample parameters and levels were selected due to their being primary ingredients of traditional thermodynamic atmospheric instability (that is, warm, moist air at low levels with cooler air aloft provides unstable atmospheric profiles). Note that the GOES temperature adjustments are generally rather minimal, especially over the US land mass where the forecast models do reasonably well with temperature; larger GOES temperature adjustments (1-2 C) are more frequent over oceanic regions. The relatively more robust moisture signal measured with the GOES Sounder is evident by the considerably larger dewpoint adjustments.

  • 12 Apr 2001: The real-time display of cloud top pressures (CTP) from the GOES Sounder has been expanded to include added definition to the lowest layers, between 950 and 700 mb, as well as a second loop with more emphasis of the 48 conterminous US states. Confidence in the distinction of three layers of CTP in the lower portions of the troposphere is justified by the previous implementation, listed below, for handling maritime inversion situations.

  • 19 Dec 2000: A new version of the cloud height subroutine (gopco2__plod.for) compensates for clouds in maritime inversion regimes. The height calculation requires a series of tests to determine if the cloud is high or low. This procedure compares the 11.0, 12.0, and 4.0 micrometer windows at night and the 11.0 and 12.0 micrometer windows during the day. Surface elevation and type are also considered. This modified subroutine further requires the AVN model as a first guess (versus the Eta model). This new product is by no means perfect, but it certainly provides more realistic heights over the Eastern Pacific than in the past (950-850 hPa rather than 750-650 hPa). This new technique was successfully implemented on an experimental basis, starting back in late September 2000, running in parallel to the old version (using the Eta as a first guess with no additional logic to determine cloud type). This new version was installed in the CIMSS routine processing on 19 December 2000 (and has been running smoothly ever since).

  • 20 Nov 2000: Access to the text file (ascii) listings for the precipitable water and cloud top values from the last available hour has been added within the real-time PW and CTP sections.

  • 02 Nov 2000: The display of three layers of, plus the total of, precipitable water (PW) from the GOES Sounder at the last available hour has now been included in the section on PW coverage of the US. Determination of the vertical distribution of moisture in otherwise similar areas of equal total PW amounts is now possible.

  • 24 Oct 2000: The displays and animation of all 19 spectral bands of the GOES Sounder have now been expanded to include an option for GOES-10, covering the western US. Due to the geometric aspect ratio of the western US ("conus") sector for GOES-10 (being "tall" in latitude but "narrow" in longitude), the GOES-10 display shows imagery at 10 km horizontal resolution (versus 20 km for the more extensive coverage from GOES-8 in the east).

  • 06 Oct 2000: Band 5 (13.4 um) has been added to the selections available as individual Sounder band composites of GOES-8 and -10. The capability to interactively toggle between any pair or more of the individual composites from the latest hour was also added.

  • 05 Sep 2000: Animated image loops on the CIMSS Realtime GOES Page are now solely available as "java" animations. No longer are "fli" files being made. (Most of the products had already been provided in the more universal "java" format for over a year.)

  • 30 Jun - 14 Aug 2000: During the NOAA Science Test period of the GOES-11 (L) check-out, Sounder imagery (all bands in 20 panel format) and products (PW, LI, CTP) from GOES-11 were displayed in near real-time. Besides typical animation loops of the last 24 hours, the GOES-11 data from the last hour were also shown compared to the same from the GOES-8 and -10 composite. GOES-11 was stationed at 104 West longitude. The last day remains as a sample of the CIMSS Realtime GOES-11 Page.

  • 28 Jun 2000: Difference plots of the GOES Sounder retrieved values for PW and LI compared to their first-guess values are available for the last six hours,framed within the background of the appropriate DPI. Three sectors are available (North Central, SouthEast, and SouthWest). Java controls provide animation and overlay capability.

  • 25 Apr 2000: The Total Column Ozone DPI is now displayed in a Mercator projection and uses ozone estimates from all four Sounder sectors. The format of the ozone "psuedo" DPI has been altered such that it is now identical to a true DPI produced with a retrieval program.

  • 19 Apr 2000: The color enhancement table (GDCE505) now used for the CAPE DPI employs a smaller number of major distinctive colors (brown/beige>blue>yellow>red>magenta/purple), primarily switching at each 1000 J/kg level. Within each major color, shading on the order of about five levels is readily apparent. The previous enhancement table (GDCE500) had a few too many different colors, some of which seemed to "repeat", or were too similar, especially considering the typically large variations often seen in the CAPE DPI pixels.

  • 7 Apr 2000: The localized "Wisconsin Cloud Product" display is no longer being produced. Large views of the cloud top pressure DPI remain.

  • 25 Jan 2000: An interactive tool is now available for selecting a location where one wishes to see a plotted graph of the time series trend for the last 24 hours worth of GOES Sounder DPI values of total precipitable water (PW [mm]), lifted index (LI [degC]), and convectively available potential energy (CAPE [J/kg]). The locations are chosen within a display of the most recent DPI imagery. Thin lines in the plot indicate periods of unavailable retrievals. This "java" capability was developed by T. Whittaker at CIMSS as part of the VISIT program.

  • 7 Oct 1999: As of 17UTC on October 7th Total Column Ozone (TCO) retrievals are using a new set of regression coefficients. Quality seems to have improved (with respect to TOMS TCO data).

  • 31 Aug 1999: Total Column Ozone images are now "pseudo" DPIs instead of numbers plotted in color. "Java" animation loops have also been added for ozone.

  • 27 Aug 1999: "Java" animation loops are now available for the DPI. (This should be helpful to those who have difficulty displaying the "fli" loop files.)

  • 13 Aug 1999: As of 14 UTC, the cloud product enhancement has been changed. The low cloud category now includes 900-800-700 mb cloud top pressures as one color. The former version included three color levels for this range, the new version now consists of one. The reason for the change is due to the limited vertical resolution of the first guess and the inability of the Window technique of the cloud top pressure algorithm to provide accurate information. An example of this shows that our cloud masking step confidently identifies whether a fov is cloudy or clear based on the visible imagery (upper left) and the SST analysis. The 11 micron window image (upper right) shows that the clouds are all very low (i.e. between the surface and 750mb). The temperature/moisture profile (lower right) from the Vandenburg Air Force base at 12UTC shows that the cloud top is near 950mb. This is verified by PIREP observations for the same time and location. The cloud derived image (lower left) shows the cloud top pressure to be about 750mb.

  • 08 Jul 1999: Following the 28 June 1999 loss of the machine ("oldthunder") responsible for much of the generation of displays for the realtime GOES product stream, transfer of all functions to another machine ("suomi") was completed. No longer are any "mpeg" animations being made (as overhead on their production is too costly); animations remain available in "fli" format.

  • 10 Feb 1999: An initial display of CAPE (Convective Available Potential Energy) as a psuedo DPI has been added to the page, following the Lifted Index stability section. This CAPE DPI is generated, after the fact, from the 3x3 retrieval values. A preliminary enhancement table is being used.
    Note that no "mpeg" animation of CAPE is being provided, as the overhead on mpeg generation is substantial and the phasing out of such files is being considered. Looping remains available in "fli" format, and more "java" animations will be implemented in the future.

  • 28 Jan 1999: The precipitable water DPI enhancement table has been modified to the new proposed "consensus default" table. This table (GDPW1.ET) shows each 10mm block distinctly, with finer resolution to near 2mm by more subtle shading, while avoiding use of conflicting colors (as perceived by color-challenged users). For more information, comparisons, and details, see the GOES DPI ET Page. The change is effective as of 12 UTC.

  • 05 Nov 1998: A Great Lakes Sector 12-hour animation of Sounder Bands 10/11 has been added; this product was requested by the NWS forecast office at Grand Rapids, MI, for evaluation during the 1998-1999 Lake Effect Snow season.

  • 28 Oct 1998: The previous central/east US views of PW and LI DPI (solely from GOES-8) have been replaced by a view of the "entire" conterminous US (from composites of all GOES-8 and -10 sectors).

  • 27 Oct 1998: For current status of the GOES satellites, a link was added to the NOAASIS page.

  • 17 Sep 1998: Some text was added in the page (disclaimer, more GOES links, support acknowledgement).

  • 04 Sep 1998: Band 15 (4.45um shortwave CO2) was added to suite of single band composites, for purpose of helping to monitor the radiometric quality of GOES-8 and GOES-10 Sounder data.

  • 21 Jul 1998: Western coverage for GOES Sounder products was switched from GOES-9 to GOES-10. GOES-10 continues to drift westward towards its final destination of 135 W.

  • 24 Jun 1998: The GOES Sounder Total Ozone Product was added; animations will soon follow...

  • 18 May 1998: As of 18 UTC, the cloud product is available in two full resolution independent formats. The first is cloud top pressure and the second is effective cloud amount. In addition, an error in calculating effective cloud amount was corrected. The old way (OW) versus new way (NW) computed too much overcast as opposed to broken or scattered. The result for effective cloud amount showed a significant increase in broken and scatter conditions. As expected, the cloud top pressure product was not affected.

  • 24 Apr 1998: Hourly displays of all 19 spectral channels from the GOES-8 Sounder (over the central and eastern US) have been added.

  • 20 Mar 1998: The CIMSS Realtime GOES Page resumed nominal operations, following the switching earlier in the week of the web serving machine (from "oldthunder" to "maple", with the alias remaining as "cimss"). Upon resumption of realtime displays, spatial composites from GOES-8 and GOES-9 of individual Sounder bands were added. The select bands were 3, 8, 11, 12, and 17.

  • 08 Feb 1998: As of 03 UTC, the AVHRR SST which is used for the skin temperature value over the ocean is back to its daily updating. Previously an old (97353) area was used. The derived total precipitable water image shows that with the new SST has slightly less cloud than the old SST. Both versions correlate qualitatively well with the corresponding observed sounder IR window and visible image. Overall, the TPW difference was less than a RMSE of 0.2 mm.

  • 30 Jan 1998: As of 15 UTC, the GOES-8/9 derived cloud top pressure algorithm for the Sounder replaced the RTTOVS transmittance model with the PLOD model. The changes between the new version (PLOD) and the old version (RTTOVS) are small. On average the PLOD version is lower in pressure (higher in altitude) by about 15mb and 2% lower in effective cloud amount than the old version for all levels of clouds. Examples of the old version (RTTOVS) and the new version (PLOD) are shown.

  • 13 Jan 1998: As of 21 UTC, the GOES-9 instrument noise is used for the GOES-9 soundings (not the GOES-8 noise). Only very slight changes were noted. The error was only in the CIMSS experimental version 1.75 retrievals.

  • 05 Jan 1998: A script was enhanced to create the 23 UTC combined sounder water vapor channel-11 gif as well as the other 23 hours. (Basically, one needed to be subtracted from the day-of-year count, if the processing time was after 00 UTC.)

  • 16 Dec 1997: One of the cloud-clearing tests was relaxed. The test uses the 13.3 micron band.

  • 11 Dec 1997: As of 15 UTC, the size of the processing box was reduced from a 5x5 field of view (fov) array to a 3x3 fov array. This increases the product resolution from approximately 50km spacing to 30km spacing. Examples from GOES-8 for total precipitable water and cloud top pressures are given. Radiosonde co-location stats for GOES-8 show the 3x3 retrievals are slightly improved compared to the 5x5 retrievals.

  • 21 Nov 1997: Additional checks were incorporated to limit any possible cloud contamination. These include using the SST in the retrieval, rejecting the retrieval if the cloud-cleared observed channel 8 (IR window) value is 1.5C colder than the calculated value from the first guess, and flagging retrievals if the SST background is not available. These changes affect less than 2% of the total number of retrievals. For more information on these changes.

  • 03 Nov 1997: The cloud clearing subroutine has been enhanced. Ignoring the visible check over elevated mountainous terrain in the cloud detection algorithm has alleviated the problem of spurious clouds. The cause is a relatively high surface albedo observed by the GOES sounder visible band. For an example from GOES-9 before and after this correction.

  • 18 Sep 1997: Switched to a full retrieval (version 1.75) for both the GOES-8 and -9 sounder products of Total Precipitable Water and Lifted Index. The image resolution is processed at a 5x5 field-of-view spacing. Version 1.75 is the PLOD transmittance model, plus: the zenith angle cut-off is increased from 60 to 62.5 degrees; we have turned off one of the cloud-clearing test to increase night-time coverage; and there's now a 2 degree guess temperature change limit due to the skin temperature. For more information.

  • 23 Jul 1997: Changed ocean emissivity to 0.99 for cloud derived image to be consistent with temperature/moisture retrieval algorithm.

  • 27 Jun 1997: PW and LI enhancements adjusted for moist unstable summer conditions (GDPW15.ET, GDLI8.ET).

  • 26 Jun 1997: ETA model replaced NGM model for use as first-guess.

  • 09 Jun 1997: Adjust PW enhancement for summer (GDPW106.ET).

  • 26 May - 03 Jun 1997: Sounder calibration was not fully correct.

  • 19May 1997: Add displays of GOES Imgr Regression SST DPI.

  • 15 May 1997: Add plot of radiosonde values to LI DPI.

  • 05 May 1997: Add plot of radiosonde values to PW DPI at 00 and 12 UTC.

  • 17 Apr 1997: Lake Effect coverage replaced by central US look.

  • 09 Jan 1997: Adjust PW enhancement for dry winter (GDPW332.ET).