The combination of near-record heat, very high humidity, and a vigorous cold front is already triggering strong thunderstorms in Pennsylvania.
This is just the first area that will be affecting the state today. More storms will be developing this afternoon. As a result, a Severe T’storm Watch has been issued for much of the Philadelphia area until 7 p.m. (in the pink color).
Storms will intensify quickly, and move even faster, at about 50 mph. There are very strong winds high up in the atmosphere that are steering the storms. Sometimes those winds can make it down to the surface in a strong thunderstorm. That is the setup for potential wind damage, which is the greatest threat today.
Courtesy of philly.com
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