My morning update. I may need to lower southern New Jersey amounts pending 18Z and 00Z runs and observations/radar. Yes it's going to move to 100 miles e-se of Cape Cod per latest Euro. Moving into nowcasting mode.
WX/PT
For the NYC Metro Region, the National Weather Service has upgraded our Winter Storm Watch to a Winter Storm Warning valid through Saturday. It will snow off and on all day today leaving a dusting to an inch of snow in spots as an arctic front passes southeastward across the region squeezing out the moisture in the atmosphere. Behind that front brutally cold north northeasterly winds will increase driving temperatures downward into the upper teens and lower 20s tonight. Meanwhile our storm is taking shape off the Florida coast as I write. It will move northward to offshore of the Carolinas tonight and from there northeastward to near Cape Cod by tomorrow afternoon. The main event gets underway tonight between 7-10PM as snow will overspread our area from south to north. It will be light at first but heavier snow bands will move into the region during the early morning hours Saturday dropping 1-2"/hour over the city and western LI and 2-4"/hour over Suffolk County where a Blizzard Warning is in effect. Winds will gust to near 60MPH during the storm causing white-outs and near blizzard conditions with blowing and drifting of snow and near zero visibilities especially over eastern LI and southeastern Ct. Thundersnow possible. Snow should taper off and end around 3-5PM Saturday. Amounts expected--NW New Jersey 3-6", Just NW of NYC and interior southern NJ including Rockland and Westchester oounties 4-8", NYC five boroughs 7-11", Western LI/Nassau western coastal CT 8-14", Southern Coastal New Jersey and western Suffolk Cty 12-18", The Twin Forks/East End of LI and Southeastern Ct 16-22". If you're thinking of escaping to Boston 18-24" there. Stay Safe!!