Thursday, August 09, 2012

Spotty Thunder Possible Later Today


Some localized fog in parts of the region this morning -- not everyone is getting fogged in but a few spots in New Jersey have lower visibility levels to deal with this morning in the quarter to three-quarters of a mile department.  The region is a couple of degrees warmer than yesterday -- upper 60's to mid 70's depending on location to start the day -- and will end up a couple of degrees warmer than yesterday by day's end.  Assuming that takes place, we should get to the lower 90's this afternoon for highs around the Delaware Valley...day 35 of 90 and above in Philadelphia.

While the region is generally precip-free this morning, the combination of humidity and daytime heating will aid in the development of scattered afternoon thunderstorms around portions of the region.  Odds favor north and west of the city as the locations that could see a scattered storm or two later on -- we're not talking about anything widespread but a 30% chance that anyone, especially northwest of town, could get in on some pop up thunderstorms after 2 or 3 PM.  A more solid line of thunderstorms could fire up in Western PA later on today -- there's a slight risk for severe weather out to about Williamsport in North Central PA but as of this morning there is not one locally.  Any storm that does develop could be locally strong and produce gusty winds and heavy rains.

A better chance of storms exists in the forecast for tomorrow as a frontal boundary pushes into the region from the west.  We're still under a slight risk for severe weather for Friday (at least as of this morning), with the potential for gusty winds in any of those heavier thunderstorms that fire up.  Heavy rainfall may ultimately be the bigger threat tomorrow for most of us but there's enough instability around that gusty winds will be an issue as well.