A little surprised NWS kept the advisories for a general 2-4" for almost all of NJ (except Warren/Morris with 1-2" and far SE NJ/DE near ocean, where they'll see more rain), all of eastern PA, and NYC/LI. They're hedging their bets as I thought they might be - can tell from the write-up in the NWS-NYC AFD, as per below (same logic applies for the Philly office). They know some places will get 2-5", but don't know where, and that most places will get 1-2", but don't know where, and that a few places will get nearly nothing...but don't know where. So, you go with 1-4" region-wide, effectively. Nowcasting time. I'll be happy with an inch or two after all this...
.NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/...
LOW PRES DEVELOPS EAST OF THE DELMARVA THIS EVENING...AND THEN
PASSES SOUTH OF LONG ISLAND AND TOWARDS THE 40/70 BENCHMARK LATE
TONIGHT AND INTO DAYBREAK WEDNESDAY.
SOME LIGHT SNOW WILL DEVELOP THIS EVENING...AND THEN AS BANDS OF
MODERATE SNOW WILL DEVELOP AROUND THE LOW...THOSE BANDS WILL MOVE
INTO THE LOCAL AREA. LATEST NAM KEEPS THE HEAVIER BANDS
OFFSHORE...WHILE THE LATEST GFS BRINGS THEM ACROSS NYC AND LONG
ISLAND. LATEST ECMWF DOES NOT REALLY INDICATE MUCH BANDING...AND
HAS MINIMAL LIQUID QPF OVERALL. IF THOSE SNOW BANDS MATERIALIZE
AND MOVE ONSHORE...THOSE AREAS COULD PICK UP 2-4 INCHES OF
SNOW...WITH SOME AREAS...ESPECIALLY ON EASTERN LONG
ISLAND...PICKING UP 3-5 INCHES. THE SNOW AMOUNTS WILL BE WIDELY
VARIABLE...WITH SOME AREAS UNDER THE ADVISORY NOT GETTING MUCH
MORE THAN A DUSTING TO AN INCH OF SNOW. IT ALL DEPENDS ON WHERE
THE BANDS SET UP.
Just looking at the radar, having a hard time believing anyone is going to get more than 1-2", which is part of the reason the NWS has started what could be a long slow reduction in forecast snowfall amounts, although they kept most of the advisories, for continuity sake, even though advisory criterion is 3" or more for counties north of 276/195 in PA/NJ (and all the NYC metro counties). Have seen this rodeo before, lol. Have seen maybe 1/4" tonight after our 1/2" this morning - will see if we can get to 2" total, so at least the 2-4" advisory can verify.