Winter Storm Watch cancelled for much of the area previously posted, replaced with Winter Weather Advisory for 1-3".
This shouldn't impact anyone's plans.
Where are you seeing this? NWS has cut back maybe 1/2-1" across the board, but didn't change the advisories/warnings anywhere (still warnings for about all of South Jersey for 5" of snow), although the warnings will be harder to reach as they noted in their discussion. Now looking more like a 2-5" event for most instead of 3-6", with 1-2" well N/W (Sussex/Warren and the Lehigh Valley/Poconos) and up to 6" towards the coast, especially south of 195 (except at the immediate coast, where there could be mixing with rain). Snow onset will also be delayed by a few hours.
http://forecast.weather.gov/product...&format=CI&version=1&glossary=1&highlight=off
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
630 am update: The dry air near the surface continues to be a
hindrance for snow making the move northward, but it looks like
the process is beginning now thanks to substantial large-scale
lift approaching the area. As a potent
vort max approaches the
Mid-Atlantic today,
jet dynamics combined with considerable
differential cyclonic
vorticity advection will permit widespread
precipitation to develop north into the area. Timing of the vort
max appears to have slowed by 3-6 hours...another reason for the
slower onset of precipitation across the area. However, the dry
air near the surface will continue to pose problems early on in
the event for much if any snow to accumulate north of the
Mason-Dixon Line. The trend of the HRRR and HRRR-X has been
downward with
QPF today, though not substantially so. The 06Z
NAM
Nest continues rather bullish in comparison but has shifted the
snow banding somewhat eastward. The dry look of the
GFS is
worrisome, particularly with considerable precipitation ongoing
in the western Atlantic (which may prevent as much northward
advection of more substantial
moisture).
Using an updated consensus blend of the 06Z
GFS, 06Z
NAM Nest,
several HRRR cycles, the 00Z RGEM/WRF-ARW/WRF-NMM, the latest
WPC guidance, and some continuity,
QPF went down a few
hundredths of an inch across the area, with most places
receiving up to an inch less of snow than the forecasts this
past evening. This warrants no change to any of the winter
headlines at this point, though the winter storm
warning for the
counties bordering the Delaware River looks pretty borderline.
General thinking is aligned fairly similarly to the previous
forecast, with the ramp-up in snow during the next 6 hours and
the best period of accumulation for the
CWA this afternoon (into
early this evening). Did slow the increase of
PoPs north of the
Mason-Dixon Line a little bit more, but based on latest
radar
trends, expecting to see some flakes in the urban corridor
within the next couple hours.
Given the rapidly evolving nature of the forecast given some
short-fused model uncertainty/discrepancies, expect frequent
updates/amendments to the forecast today. Sometimes, higher-
confidence forecasts can deteriorate as the event nears, and
this appears to be a classic case of that.
&&
.SHORT TERM /6 PM THIS EVENING THROUGH 6 AM SUNDAY/...
Vort max will be moving through the region tonight, and the
large-scale lift ahead of it will be shunted eastward during the
evening hours. This should
mean a fairly quick west-to-east
progression of the western fringe of the snow this evening, with
the region
likely drying out after midnight. End times for the
winter storm warnings and winter weather advisories look OK at
this time.
Snow totals will
likely be under 3 inches in the Lehigh Valley
and Poconos, but given the fairly aggressive 00Z
NAM output, may
see some marginal advisory-level totals here. Will keep an eye
on this tonight. Meanwhile, 2-4 inch totals look possible for
the urban corridor, with 5+ totals expected south of I-195 and
southeast of I-295 (with increased confidence the farther south
and east you go, at least until the beaches). Confidence in snow
totals is around average, but slightly less than that in the
urban corridor, where the sharpest
gradient in snow totals
exists.