Monday, January 16, 2012

Updating Tonight's Rain (& N/W Sleet/Ice)

We don't think icy rain will be an issue tonight in the city itself although a few sleet pellets can't be ruled out in the hills on the northwestern fringe of the city itself.   Radar up above as of 5:30 shows the precipitation working into Central Pennsylvania, with clouds increasing quickly across the Delaware Valley this evening.  Showers will first reach into the Lehigh Valley after 8 PM, probably into the Philly area around 10 or 11 PM this evening.   These showers could be mixed with sleet as they move in later on.

Temperatures are in the 30's across the region, with dew points in the teens locally.  They do increase...albeit slowly as one moves to the west.  This is important over the next few hours as precipitation moves in.  Temperatures might nudge down a few degrees in response to the light rain moving in.  In the colder locations like Quakertown, Perkasie, and Upper Montco above 422 the chance of some slick travel will increase...and will be higher as one works north into the Lehigh Valley and then into the Poconos later on.

Conditions will improve late tonight as temperatures moderate above freezing in the Lehigh Valley, with slick travel mitigated by temperatures rising into the middle 30's.   Roads could remain slick into the morning hours in the Poconos, however, as colder air lingers there longest.

This isn't going to be a significant storm by any stretch -- rainfall totals should be modest and generally on the order of a half inch or less...however, with temperatures marginal at the surface there will be some localized slick travel in the outer suburbs and some sleet mixing in down into the suburbs closer to Philadelphia.

More:  Current Weather Page