As we talked about earlier, a couple of nice days are in the forecast tomorrow and Friday, with tomorrow arguably the nicer of the two days. High pressure builds to our north on Friday and will help develop an onshore flow on Friday afternoon, meaning that cooler air off of the Atlantic will nudge in for the Shore Points and for South Jersey although it will still be a pretty decent day overall.
Saturday, however, will not be a decent day. A storm system will organize in the Plains over the next couple of days and slowly lift northeast into the Great Lakes. That system will drag a cold front south through the US and will spread rain on into the region for Saturday. A wave of low pressure may organize on the front and, combined with that onshore flow from the high to our northeast, will help develop some significant rain and thunder for the region for Saturday afternoon and evening.
Computer guidance between the GFS and Euro has been showing the threat for heavy rain lifting northeast from the Appalachians through Pennsylvania on Saturday afternoon and evening, spreading over an inch of rain through the region, perhaps two inches of rain where the axis of heaviest rain tracks along the wave of low pressure within the surface front (depicted by the blue shade on the GFS above). In addition to the rain, gusty winds from the east and southeast will add insult to injury. Wind gusts on Saturday afternoon and evening could gust to over 40 mph, especially at the coast.
This system will pull out of here early Sunday morning, with sunshine returning in the afternoon and providing us a nice ending to a weekend that starts out rather wet.
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