Aviation Forecasts and Information Page - NWS State College PA

.AVIATION /09Z WEDNESDAY THROUGH SUNDAY/...
Update - for the Overnight: 

KCCX Radar showing some slightly enhanced inbound velocities
drifting SE of a line from KDUJ to KELM over the past 30
minutes, likely depicting some ducting of the beam within the
shallow, cool airmass behind a very weak cold front.

This boundary may move another 30-50NM further SE overnight. 
only a very subtle wind shift to the WNW by 10-20 deg is 
expected in the wake of the frontal passage. 

The main impact we'll see will be the formation of some IFR to 
LIFR stratus later tonight through early Wed across the NW Mtns
(KBFD) where milder air aloft and a slight uptick in Theta-E 
will drift in from the SW - overrunning this shallow cooler
airmass.

The wind should go light for most places overnight as high 
pressure moves in. There is a 50% chc that fog forms in some of 
the river valleys tonight. We did not go IFR anywhere due to fog
at this point, but do mention VCTY FG at several sites. BFD is 
the only terminal that is more than likely (90%) to go IFR as 
low clouds move down from the N. These low clouds may get as far
SE as IPT/UNV, but there's only a 30% chc of that. 

The low clouds in the N should break up a few hrs after 
sunrise. Sct VFR cu or altostratus will then lift northward into
PA after noon concurrent with high clouds increasing from the 
N. Low pressure approaches quickly from the W with the storm 
maturing rapidly, too. 

Conditions gradually deteriorate to IFR over the west first on
Wed night, with -RA spreading across about half the state by
sunrise Thurs. LIFR clouds are possible in the N/W Thursday and
some snow may mix in to BFD and JST by sunset. BR/FG also
expected in many places as the clouds and precip become
widespread but light Thurs. The occluded sfc low will likely
jump to the E later in the day, but the passage will veer the
wind to the SW then NW before the end of the day. LLJet seems
not strong enough or low enough to mention any LLWS. any showers
left Thurs night and Fri will be -SHSN in BFD and JST. UNV, AOO,
IPT may see some flakes mix in, but not last more than an hour
at a time (showery).

Outlook...

Fri PM...-SHSN, ocnl IFR NW. -SHRA, MVFR SE. Gusty NW wind.

Sat...Improving, but still gusty with MVFR clouds and isold
-SHSN for BFD/JST. VFR elsewhere.

Sun...VFR, gusts NW 15-25KT.

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