1-minute Mesoscale Domain Sector GOES-16 (GOES-East) Visible/Infrared Sandwich RGB images from 1257-1950 UTC on 04 April 2023  (above) showed thunderstorms that produced hail up to 4.0 inches in diameter in Iowa and a wind gust to 90 mph in Illinois (along with a brief tornado) (SPC Storm Reports).1-minute GOES-16 Visible/Infrared Sandwich RGB images with an overlay of GLM Flash Extent Density... Read More

With a strong midlatitude cyclone centered over Iowa on 31 March 2023, the Storm Prediction Center (SPC) outlined 2 areas of relatively rare High Risk for severe weather — and GOES-16 (GOES-East) Total Precipitable Water along with the Lifted Index (LI) and Convective Available Potential Energy (CAPE) Derived Stability Indices (above) showed that a corridor of moisture and instability... Read More

Much of the mid-Mississippi River valley was placed under a Moderate Risk of severe weather by the Storm Prediction Center on 31 March 2023. Day Night Band imagery from NOAA-20 (mislabeled as Suomi NPP), above, shows two bore-like features with very different orientations (there is also a notable lightning feature over eastern South Dakota!). The feature over Iowa is... Read More

1-minute Mesoscale Domain Sector GOES-16 (GOES-East) “Clean” Infrared Window (10.3 µm) images (above) include plots of time-matched (+/- 3 minutes) SPC Storm Reports during an outbreak of deadly tornadoes across parts of Mississippi, Alabama and Tennessee late in the day on 24 March 2023. The coldest thunderstorm tops exhibited infrared brightness temperatures around -70ºC (darker black enhancement).A... Read More