June 19th, 2021 | Scott Bachmeier
1-minute Mesoscale Domain Sector GOES-16 (GOES-East) “Red” Visible (0.64 µm) images (above) include time-matched plots of SPC Storm Reports — and showed severe thunderstorms associated with the landfall of Tropical Storm Claudette (surface analyses) early in the day on 19 June 2021. Numerous pulsing overshooting tops were evident with some of these storms.
The corresponding 1-minute GOES-16 “Clean” Infrared Window (10.35 µm) images (below) displayed cloud-top infrared brightness temperatures as cold as -80ºC (violet pixels) with some of the more robust overshooting tops. On both the Visible and Infrared images, Butler County, Alabama is outlined in blue — with Interstate Highways plotted in violet. A multi-vehicle accident with 10 fatalities occurred along Interstate 65 in far northeastern Butler County around 1830 UTC (2:30 PM local time); although no severe weather was reported in Butler County, the Infrared images showed cold cloud-top brightness temperatures moving northeastward over that area during much of the morning hours, so heavy rainfall and wet roads (with some residual areas of ponding water) may have been a contributing factor to this accident. Greenville in Butler County received 1.71 inches of rainfall — but not far to the southwest, Evergreen in Conecuh County received 3.16 inches of rainfall during the landfall of Claudette.