National Weather Service United States Department of Commerce

Major Heat Wave Out West; Flash Flooding in the Mid-Atlantic

A major heat wave will consume much of the Western U.S. over the next week with dangerously hot temperatures. Widespread excessive heat warnings and heat advisories are currently in effect. Also, low humidity and dry thunderstorm potential are adding to the fire danger across the Great Basin and Northwest. Meanwhile, a system is producing heavy rain and flash flood concerns in the Mid-Atlantic. Read More >

Satellite
Imagery
 

Visible Satellite Imagery

 
The above image shows three discrete anvil shields associated with supercell thunderstorms. The northern-most storm was the one that spawned the Newcastle-Moore EF-5 tornado. The second likely produced the tornadoes near Marlow and Bray.
 
The satellite loop above shows how rapidly supercells formed during the afternoon of May 20th.
 
Satellite Loop from the NOAA Visualizations YouTube Channel