Back to the weather. Wind chill advisories are up for the region for -10 to -20F wind chills Sat night and Sunday, with air temps Sunday morning likely falling to close to 0F, even in the big cities (and -5 to -10F in the colder suburbs). Could also see a dusting to 1/2" in spots in snow showers tonight. The pussies (@mildone) that run our Sunday morning soccer matches cancelled due to the cold. :>)
For the Mon/Tues storm, it's likely a mostly rain event for the region, but could start out as snow for several hours Monday afternoon/evening, leaving an inch or two of snow, especially the further west one goes, given a likely track just inland of the coast; areas well N/W could get several inches on the front end, but should change to plain rain there, too; freezing rain is looking unlikely, given the vertical thermal profiles. Even if the track is off the coast, it's likely there's not enough cold air in place to keep this from being mostly rain (the cold high will be too far east to lock cold air in here, as it'll be off the Canadian coast), although a track like that would likely bring a few more inches of snow. A more inland track and all rain is also a low probability.
There is also the chance of some pretty high winds with the Mon/Tues storm (could see high wind advisories, even inland), as well as minor to moderate urban and small stream flooding, as reservoirs and rivers are pretty full, especially if we get more than 2" of rain which is a decent possibility.
http://www.weather.gov/phi/
Looks like record breaking cold overnight for some locations, with wind chill advisories for most and warnings north of about I-80 (also a wind advisory for gusts up to 45 mph). Here are some predicted lows vs. records:
STATION......RECORD/FORECAST MIN FOR 2/14
CENTRAL PARK.....2 (1916) / 0
LAGUARDIA........1 (1979) / 1
KENNEDY..........4 (1979) / 2
ISLIP............7 (2015) / 1
NEWARK...........0 (1979) / 0
BRIDGEPORT.......3 (2015*) / -2
TRENTON............0 (1979) / 0
PHILADELPHIA....2 (1979) / 2
With regard to the storm, the main energy should be on shore in the Pacific NW tonight, so hopefully we'll get a better handle on the track of the storm tonight and tomorrow. Right now the NWS in Philly is calling for a track just east of the Apps/Poconos, while the NWS in NYC is calling for a track just inland of the coast.
That's why the NWS in NYC is predicting more front end snow on Monday (you can see it on the maps at the boundary counties) with 1-2" along/near I-95 for NYC/NENJ/LI and 2-4" for Bergen/Passaic and the Hudson Valley/CT, before a changeover to heavy rain for all by Monday night (early Tuesday well N/W), with 1-2" of rain likely.
NWS-Philly is calling for an inch or less of snow from I-95 to the coast (from Philly to Woodbridge and points S/E of that line), 1-2" about 10-20 miles NW of I-95, then 2-4" for the Lehigh Valley, Poconos and NW NJ (Morris, Sussex, Warren and NW Hunterdon), again with a changeover to 1-2" of rain for all by Monday night or early Tuesday well inland.
There could be a period of freezing rain well to the NW of I-95 (the areas possibly getting 2-4" of snow), but freezing rain is very unlikely anywhere near I-95 to the coast, although freezing rain is difficult to predict and if the air temp warms up much faster than the ground temp (not currently forecast), there could be some surface icing almost anywhere. In addition if we get 2" or more of rain, which is possible, we could see some minor to even moderate stream/river flooding, especially with the frozen ground not allowing infiltration.
http://www.weather.gov/phi/