Ok so we are tweaking the forecast and if anything after looking at the Gulf of Mexico I'm seeing a bigger storm right now. The models came back up with a .35" on the GFS and .46" on the NAM. This means we are in 3-5" range for Philly Metro. The Euro is out soon and on the last run it actually went down a bot so we'll see if it can serve up more snow.
We are on the edge of a WINTER STORM WATCH for Philadelphia and the Delaware Valley so we'll see if the National Weather Service decides to leave it at the WINTER WEATHER ADVISORY or take it up a notch.
HERE IS THE CRITERIA FOR A WINTER STORM WATCH...
Winter Storm Watch
Issued 36 hours in anticipation of a significant winter weather event (Watch), area specific as to the criteria for issuing such an advisory, and a warning within 12 hours of a storm if the threat becomes imminent.
Criteria for most of the Mount Holly forecast area (PHL SNJ DE LEHIGH POCONOS) is for 4 or more inches of snow expected and/or significant icing that could impact travel and property.
However the Northern counties of the Lehigh Valley and Poconos, the criteria is for over 6" expected to warrant such issuance.
As you can see my change this morning from last night was a "maybe 3-5" to now a forecast of 3-5" in SEPA for tomorrow.
TOTAL PRECIP FROM THE NAM MODEL JUST IN,,,,.51" Delaware with the jackpot over Bucks, Upper Montco, Lehigh Valley
If the NAM verifies it would be an awful bust along I-95... dry slot I mentioned earlier sets up perfectly over I-95. Someone will likely get shafted in the region between the overrunning and the coastal low, the question is where.
Explain to us the last map you posted....Total precip. 61, 50, 45 ect... You also wrote 51" Delaware with the jackpot over Bucks, Upper Montco, Lehigh Valley. I dont quite understand what the numbers mean.....