Metop-C and NOAA-20 are now both supplying NUCAPS profiles to National Weather Service AWIPS machines. Both the vertical profiles and gridded fields are available. The toggle above shows all the MetopC overpasses early on 4 April, and it includes horizontal maps of 850-mb Temperatures derived from the Metop-C NUCAPS profiles. Large swaths of satellite-derived fields are available at times (0220 UTC, 0356 UTC) when radiosondes typically are not being launched. These fields are ideal to compare to model fields as a method of model evaluation.

The toggle below compares the three overpasses of MetopC Sounding Availability points to one overpass from NOAA-20. The two satellites have very different orbital paths. NOAA-20 overlaps different MetopC orbits; the time difference if you’re comparing data varies depending on where you are in the NOAA-20 orbit.

What kind of gridded fields were available on this day? The toggle below compares the 850-mb Temperature fields from Metop-C (0220 UTC) and NOAA-20 (0832 UTC). Over the western Great Lakes and parts of Canada, this is giving information on how the 850-mb fields are evolving during those 6 hours between radiosonde releases.

You can also derive a notion on how temperatures are changing over the southern part of the NOAA-20 pass, but that requires using a later MetopC pass, as shown below in the toggle that compares 850-mb temperatures from Metop-C NUCAPS (0356 UTC) and the NOAA-20 field at 0832 UTC.

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This is a lot of excellent data that can be used, day or night. Starting in May, data from NOAA-21 will be added as well! If you’re using AWIPS, the most efficient way to view these fields is by creating Procedures.

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While the view of the Sun from the ground may, or may not be, affected by clouds during the eclipse on April 8th, the view of the Moon’s shadow on the Earth will be viewed from NOAA‘s GOES ABI. There will be imagery every 10 min from the Full Disk sectors, and 5 min from the Contiguous U.S. (CONUS) sector. There will be two Mesoscale sectors from GOES-16 ABI, although it’s not yet certain where they will be located on the Earth that day. Most likely “M1” will “follow” the shadow, while “M2” will move around to monitor any possible severe weather. There are many sites with imagery from the Mesoscale sectors, including NOAA/NESDIS/STAR (M1) and UW/SSEC geosphere (M1) and CIRA’s slider (M1).

Research Request

There has been a research request to have the Mesoscale sectors generally ‘follow’ the shadow. The idea is that the center point of the sector would change every 5 min. This would be similar to the Mesoscale scan strategy used during August 2017 eclipse (see this animation from UW/CIMSS), where the centers changed every 10 min. The second meso (M2) will be moved to monitor possible severe weather. More on the recent/planned meso locations. Of course any operational request will preempt this research request.

These ‘simulated’ mesos (M1) are cookie-cut from the Full Disk sector. It’s possible that M1 center will be updated every 5 minutes. There is a google form for researchers to request special sectors (for events such as rocket launches, etc.). The request link is also on this page of many GOES related links.

H/T

Thanks to those investigating if these meso’s can be generated on April 8th, including the NOAA NESDIS User Services team. Fun fact, this research request was initially submitted on May 3, 2023. Thanks also for the Eclipse Predictions by Fred Espenak, NASA’s GSFC. McIDAS-X was used for image generation. Thanks to the satellite operators, SDM, PRO, SAB and the NWS.

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The 3-4 April 1974 Super Outbreak (NWS Wilmington OH | Wikipedia | StoryMap | Interacive WebMap | Monthly Weather Review) was one of the largest and most deadly tornado outbreaks on record in the United States.

The University of Wisconsin-Madison Space Science and Engineering Center (UW/SSEC) recently digitized over 66,000 Applications Technology Satellite (ATS)-1 and -3 images from the late 1960s to early 1970s. ATS-1 and -3 were experimental NASA geostationary satellites that carried Verner Suomi’s Spin-Scan Cloud Camera (SSCC). The camera, developed at UW/SSEC, allowed for nearly continuous viewing (usually every 30 minutes) of weather systems (the SSCC on ATS-1 and -3 had only visible spectral bands, hence only provided imagery during the daylight hours). Some of these images have been added to the UW Digital Collections (The “Super Outbreak“). Much work remains to prepare the larger dataset for use, including adding day/time stamps, quality control and navigation correction of the images.

Several ATS-3 images from April 3 are shown below (thanks to the work of SSEC Satellite Data Services and Atmospheric, Oceanic and Space Sciences Library staff!).

15-minute Imagery

Normally, the ATS-3 acquired a Full Disk scan approximately every 30 minutes — but during this event two Northern Hemisphere sectors were scanned, providing 15-minute imagery for part of April 3, 1974. Individual images from 1941 UTC to 2307 UTC are displayed below. Large clusters of thunderstorms that produced many of the tornadoes were very apparent, along with a hazy plume of blowing dust that moved across much of North Texas in the wake of a strong cold front (surface analysis).

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5-minute CONUS Sector GOES-16 (GOES-East) “Clean” Infrared Window (10.3 µm) images that included an overlay of GLM Flash Extent Density (above) revealed 2 brief flashes of lightning activity in southern Wisconsin during the afternoon hours on 02 April 2024. Heavy thundersnow (+TSSN) was reported at Madison (station identifier KMSN) at 2047 UTC and 2053 UTC, with the thunderstorm ending at 2104 UTC. Increasing snowfall rates accompanied the onset of this thundersnow.

A cursor sample of the GOES-16 cloud-top infrared (10.3 µm) brightness temperature along with the associated Cloud Top Height and Cloud Top Phase derived products at 2041 UTC (below) showed that the Height was 27884.88 ft and the Phase was Ice (as would be expected with a 10.3 µm infrared brightness temperature of -41.57ºC).

With cloud top heights less than 30000 ft, the parallax offset was fairly minimal — likely around 10 km or 6.2 miles (below).

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