SJT SVR #1

GLM minimum flash area (bottom left) rapidly fell from ~1600 km^2 to 72 km^2 over a period of 5 minutes in the storm in the NE portions of these images.





5 minutes later, this storm began displaying classic hail signatures in all-tilts base radar data, prompting a severe thunderstorm warning. I will note that several other storms displayed similar minimum flash area decreases without so quickly turning severe, but the rapid decrease was the first thing that brought attention to this storm.



Sandor Clegane