Strong northerly winds in the wake of a cold frontal passsage caused widespread blowing dust across parts of west Texas during the afternoon hours on 26 November 2011. The hazy plumes of blowing dust could be seen on GOES-13 0.63 µm visible channel images (above). At Midland, Texas (located near the center of the images) the winds gusted to 51 mph, and surface visibility was reduced to 0.5 mile at times.

After sunset, when visible imagery was no longer available, the southward progress of the airborne dust could still be tracked using a GOES-11 IR difference product (below), created by subtracting the 12.0 µm IR brightness temperature from the 10.7 µm IR brightness temperature. The larger IR difference values (around 2-3 degrees Kelvin, yellow color enhancement) represented the portions of the airborne dust cloud that were the most concentrated.

It is important to note that GOES-11 (GOES-West) is the only remaining operational GOES satellite that still has the 4-km resolution 12.0 µm IR channel on the Imager instrument (a 10-km resolution 12.0 µm channel is still on the Sounder instrument on all GOES satellites) — and GOES-11 will soon be replaced by GOES-15 on 06 December 2011. After that time, using such an IR difference product to track areas of blowing dust will have to be done using polar orbiting satellites (such as POES, MODIS, or NPP) or the GOES Sounder that still have the 12.0 µm IR channel.

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The VIIRS instrument on NASA’s recently-launched NPP satellite began to acquire imagery on 21 November 2011 (NASA news release). True Color Red-Green-Blue (RGB) images from two of the early satellite passes are shown, which cover a swath from Brazil to eastern Canada from 16:10 to 16:35 UTC (above) and another swath covering much of eastern North America from 18:00 to 18:15 UTC (below).

A VIIRS RGB image covering parts of western Australia from 05:35 to 05:45 UTC on 22 November can be seen below.

Images created at the Space Science and Engineering Center (SSEC), University of Wisconsin-Madison by the NASA NPP Atmosphere PEATE Team.

Technical notes:
– Produced by Liam Gumley and Willem Marais (SSEC)
– SDR products ingested from the NPP SD3E by Bruce Flynn, Steve Dutcher, and Greg Quinn (SSEC)
– VIIRS M-bands SVM05, SVM04, SVM03 (red, green, blue)
– 1000 meter resolution, Cylindrical Equidistant projection
– Atmospheric correction algorithm by Jacques Descloitres (Formerly GSFC)
– Reprojection algorithm by Terry Haran (NSIDC)

Additional NPP VIIRS images can be found on the VIIRS Imagery and Visualization Team site at CIRA/RAMMB.

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1-km resolution GOES-13 0.63 µm visible channel images (above; click image to play animation) revealed a mesoscale vortex (or “mesolow”) propagating slowly westward across the western end of Lake Ontario on 21 November 2011. The GOES-13 satellite had been placed into Rapid Scan Operations (RSO) mode, providing images as frequently as every 5-10 minutes. With high pressure located to the north over western Quebec, the surface winds were generally light from the east across the region — and with a stable air mass in place, no precipitation was reported at any of the observing stations as the mesolow approached the coast and moved inland.

The structure of the mesoscale vortex could also be seen using 250-meter resolution Terra and Aqua MODIS true color images from the SSEC MODIS Today site (below).

In addition, the mesolow could also be seen on a true color image from one of the early overpasses of the VIIRS instrument on the NPP satellite (below).

Thanks to David Zaff and Robert Hamilton of the NWS Buffalo forecast office for bringing this feature to our attention!

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According to the National Hurricane Center, on 20 November 2011 Tropical Storm Kenneth became the latest-forming named tropical storm in the eastern North Pacific basin since Hurricane Winnie formed on 04 December 1983. GOES-11 0.65 µm visible channel images from the CIMSS Tropical Cyclones site (above) showed a well-defined circulation, with a ship report of tropical storm force winds north of the storm center.

The corresponding GOES-11 10.7 µm IR images (below) showed a trend of increasing convection withing the northern semicircle of the storm.

AWIPS images of the MIMIC Total Precipitable Water (TPW) product (below; click image to play animation) indicated that TPW values associated with Tropical Storm Kenneth were in the 50-60 mm range (darker orange colors), as rich moisture was sill in place along the Inter-Tropical Convergence Zone (ITCZ) / Monsoon Trough.

======== 21 November Update ========

Kenneth was upgraded to a Hurricane on 21 November. GOES-15 0.63 µm visible channel images (above; click image to play animation) showed a ragged eye forming as curved convective bands wrapped around the center of the tropical cyclone. Kenneth was able to intensify in part because it was in an environment that possessed uncharacteristically low values of deep layer wind shear (below).

======== 22 November Update ========

Hurricane Kenneth strengthened to a Category 4 storm on 22 November, becoming the most intense major hurricane to form so late in the season in the satellite era. GOES-15 0.63 µm visible channel images (above; click image to play animation) showed the well-defined eye of Kenneth.

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