It was interesting to see the evolution of severe weather to the northwest of Washington, D.C. A line of thunderstorms in southern Pennsylvania and northern West Virginia was moving to the southeast, while isolated cells developed and became severe ahead of the main line near Madison, VA. It was interesting to see how the lightning from the GLM data ramped up quickly shortly before the storm became severe (it produced quarter sized hail).
I was able to note the 1 minute average flash area spread will out ahead of the precipitation area in front on the storm and also extend in the anvil behind the storm as well. As a broadcast meteorologist, it was a great way to explain to viewers the lightning threat away from the precipitation.
Gary Cannalte
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