Area Forecast Discussion
Issued by NWS State College, PA-- Remove Highlighting --
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FXUS61 KCTP 260055
Area Forecast Discussion
National Weather Service State College PA
855 PM EDT Tue Apr 25 2017
Low pressure will track north-northeast and reach the southern
New England coast by Thursday morning. This system will bring
periods of rain through tonight followed by improving
conditions later Wednesday as the storm lifts away from the
area. A summerlike pattern is forecast later this week with
temperatures likely remaining well-above normal through the end
.NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/...
-- Changed Discussion --Mid Atlantic cutoff low lies off Virginia Capes. This low will
move northeast tonight into Wednesday. Currently areas of light
rain associated with the low are wrapping northwest across PA.
As the low moves off to the northeast, rain will diminish from
the west. Low stratus will continue to obscure the ridges and
patchy fog is expected across the south.
-- End Changed Discussion --
.SHORT TERM /6 AM WEDNESDAY MORNING THROUGH 6 PM WEDNESDAY/...
A very low chance for rain will linger Wednesday morning through
midday over the far eastern part of the CWA. Main story for
Wed. will be improving conditions by afternoon with increasing
sunshine (west- to- east) and the start of a significant warming
trend that should last well beyond the short term period.
Highs Wednesday afternoon should warm into the lower to middle
70s in many areas...with mid to upper 60s in the cooler eastern
valleys which will remain murky for much of the day thanks to
morning low clouds and lingering drizzle or shower spritzes.
.LONG TERM /WEDNESDAY NIGHT THROUGH TUESDAY/...
A mild southerly flow in advance of an approaching cold front
will help boost temps +10 to +20 degrees above late April climo
by Thursday, as much of the daytime hours remain dry under
thickening clouds. Models shows the front lifting through the
area Thursday night accompanied by scattered to numerous showers
(as the parent low remains to our west and lifts across the
Great Lakes). Precip probs increase to around 60% over NW half
of CWA by Thu eve, and taper to scattered elsewhere.
Though the cold frontal boundary stalls across the region, high
pressure will keep things dry and warm on Fri. From Fri night
into Sunday things look to remain mild but become somewhat
unsettled with the medium range model guidance generating
periods of showers mainly across the NW portion of the CWA. The
placement and especially timing of these showers is difficult to
resolve at this stage with subtle waves rippling out ahead of a
system in the southern Plains - and therefore stayed close to
NBM/ECENS/WPC blend for POPS and remaining in the chance
category. While confidence is high in above normal temperatures,
the question is how warm with frontal boundaries, cloud cover
and risk for pcpn all contributing to potential bust scenario on
the high side, and latest guidance tapers temps back just a bit.
There remains a pretty strong consensus for the greatest risk
for widespread showers/tstorms on Monday May 1st associated
with a rather strong cold front and nice moisture/jet structure
crossing the Appalachians.
Temperatures will trend closer to seasonal averages behind the
front by next Tuesday May 2nd.
.AVIATION /01Z WEDNESDAY THROUGH SUNDAY/...
Low pressure lifting up the east coast will bring lowering
clouds and spotty light rain to central PA this evening. IFR
CIGs already observed at JST/AOO at 00Z and model soundings/SREF
prob charts support IFR conditions across all but IPT by late
Early low CIGs/drizzle will give way to improving conditions
Wednesday, as the storm system weakens and passes east of the
state. Model RH profile support VFR conditions at BFD/JST by
midday, while more gradual clearing takes place across the
eastern half of the state during the afternoon.
Thu...AM fog possible. Isolated PM tsra impacts possible west.
Fri...No sig wx expected.
Sat...Rain/low CIGs possible NW Mtns. Isolated tsra impacts
Sun...Low CIGs possible east. Isolated PM tsra impacts possible