Another round of severe weather in the Deep South

April 19th, 2020 |

GOES-16

GOES-16 “Red” Visible (0.64 µm, top) and “Clean” Infrared Window (10.35 µm, bottom), with plots of SPC Storm Reports [click to play animation | MP4]

Just one week after a deadly tornado outbreak across the Deep South, 1-minute Mesoscale Domain Sector GOES-16 (GOES-East) “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.35 µm) with time-matched plots of SPC Storm Reports (above) showed the development of thunderstorms over Louisiana that crossed the Mississippi border and went on to produce a long-track tornado that produced EF-4 damage on 19 April 2020. Pulsing updraft behavior and the appearance of an Above-Anvil Cirrus Plume was observed with 2 of the thunderstorms as they moved across far southern Mississippi.

Focusing on the 10-minute period 2340-2350 UTC, a sequence of GOES-16 Visible, Infrared and GLM Flash Extent Density (below) revealed a well-defined overshooting top turret which exhibited a minimum infrared brightness temperature of -87.2ºC at 2349 UTC — and a lightning jump where the FED increased to 44 flashes per minute at 2348 UTC. The long-track tornado began about 20 minutes later, at 0010 UTC on 20 April.

GOES-16 "Red" Visible (0.64 µm), "Clean" Infrared Window (10.35 µm) and GLM Flash Extent Density [click to play animation | MP4]

GOES-16 “Red” Visible (0.64 µm), “Clean” Infrared Window (10.35 µm) and GLM Flash Extent Density [click to play animation | MP4]