1-minute Mesoscale Domain Sector GOES-16 (GOES-East) “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.35 µm) images (above) showed Tropical Storm Bertha as it moved inland across South Carolina on 27 May 2020. The clusters of deep convection rapidly dissipated after landfall, revealing the low-level circulation. Bertha did produce heavy rainfall and high winds.

A GMI Microwave (85 GHz) image at 1416 UTC from the CIMSS Tropical Cyclones site (below) displayed an arc of moderate to heavy precipitation less than an hour following landfall.

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1-minute Mesoscale Domain Sector GOES-16 (GOES-East) “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.35 µm) images (above) showed training and back-building thunderstorms that produced very heavy rainfall and flash flooding across parts of South Florida — particularly in the Miami (KMIA) area — on 26 May 2020. Pulsing overshooting tops were evident, with cloud-top infrared brightness temperatures as cold as -77ºC.

The GOES-16 Total Precipitable Water product (below) revealed clear-sky TPW values as high as 2.2 inches (lighter shades of magenta).

Hourly images of the MIMIC Total Precipitable Water product (below) showed the rich tropical moisture associated with a tropical disturbance that had resided over the region for several days.

AMAZING #Miami rainfall!
6.61″ in just over the past 2 hours
7.22″ so far today = 3rd wettest May calendar day
18.70″ so far in May = WETTEST May on record since 1896.
And the training continues across Miami-Dade County. Flash Flood Warning until 9:30 PM. pic.twitter.com/PjTv0V5u1U

— Mike Seidel (@mikeseidel) May 26, 2020

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The visible and infrared bands from GOES-6 observed the historic (31 May 1985) tornado outbreak over Pennsylvania and other parts of the Northeast. For the IR band, the coldest cloud-top temperatures are highlighted with colors. Here’s is a visible animation a bit more zoomed in.

A GOES-6 visible loop, starting at 11:00 UTC on May 31, 1985 (and ends at 01:00 UTC on June 1, 1985):

A similar  GOES-6 visible loop, but a bit more zoomed in. Loop starting at 11:00 UTC on May 31, 1985 (and ends at 01:00 UTC on June 1, 1985):

A GOES-6 infrared loop, starting at 11:00 UTC on May 31, 1985 (and ends at 00:30 UTC on June 1, 1985):

 

Fade between a GOES-6 Visible and Infrared band:

https://cimss.ssec.wisc.edu/satellite-blog/images/2020/05/goes6_PA_1985_fader.html

“Swipe” between a GOES-6 Visible and Infrared band:

https://cimss.ssec.wisc.edu/satellite-blog/images/2020/05/goes6_PA_1985_swiper.html

 

NOAA GOES-6 data are via the University of Wisconsin-Madison SSEC Satellite Data Services.

More on this case, from Wikipedia and NOAA’s NWS.

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The NOAA Storm Prediction Center’s Convective Outlook (graphic) from 1630 UTC 23 May 2020 shows an enhanced risk of Severe Thunderstorms in northern Illinois with a sharp cutoff in probabilities to the north in southern Wisconsin. The imagery above shows the GOES-16 ABI Band 2 (0.64 µm) visible imagery (click here for Band 13 (10.3 µm) Infrared Imagery), and it shows convection over northern Illinois/southern Wisconsin ahead of an obvious vorticity center in Iowa. How far north will the convection build?

This question can be answered by considering lower-tropospheric (900-700) and mid-tropospheric (850-500) lapse rates diagnosed from the NUCAPS Profiles produced from the NOAA-20 pass over the Upper Midwest at ~1818 UTC (NOAA-20 orbit for this day shown here); these data were available within AWIPS by 1915 UTC! 

The toggle below shows ABI Bands 2 and 13 (0.64 µm and 10.3 µm, respectively) as well as the lapse rates. The Lower Tropospheric lapse rates show a north-south gradient in stability, with air that is more stable over Wisconsin; convection over Illinois should weaken as it moves north. Mid-tropospheric lapse rates show a similar gradient in stability albeit less pronounced. (Click here to view the lower-tropospheric lapse rates overlain with NUCAPS sounding availability points from AWIPS, color-coded to show whether or not Infrared and/or microwave retrievals converged. Over southwest Wisconsin/northwest Illinois, perhaps you can argue that the gradient is influenced by soundings that did not converge; that argument would be harder to make over northcentral/northeast Illinois and southcentral/southeast Wisconsin).

This post is to remind you that satellite-derived retrieval data (independent of model data) is available in AWIPS in a timely manner to help you diagnose the thermodynamic state of the atmosphere. (Added: Storm reports for this event are here. Severe weather did cross into Wisconsin but was very close to the Illinois border).

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