After a prolonged period of rather subdued weather, there is once again a threat of strong thunderstorms this evening across the region. As of 5:45pm, a few showers have invaded Southeastern PA, but stronger activity associated with a cold front will threaten later. Some thunderstorms have already produced wind damage across Central and Western PA and that threat will continue as the storms march east across the Keystone state. The one caveat that may prevent us from receiving similar damaging weather is a slightly more stable atmosphere across the Delaware Valley, with temperatures and dew points (two important ingredients to fuel thunderstorms) lower around here than they were earlier out west.Nonetheless, we invite you to follow our Twitter account, @TheWeatherWord, for updates this evening as the storms move further east. We also invite you to send us any observations of severe weather.
Update (6:00pm):
A backdoor cold front feature is pushing south from New Jersey into portions of SE PA, mainly Bucks county at this point. The air mass behind this front is considerably more stable, with temperatures falling into the lower 60s and dew points dropping well below what is normally needed for thunderstorms. It will be interesting to see how the storms, as they move east, interact with the cooler air mass, however it is looking more and more like the severe weather will elude us to our west. Highest threat remains across far western suburbs (i.e., toward Berks/Lancaster counties). Continue to follow us on Twitter for updates!.

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