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Latest PA Weather Summary:

633
AWUS81 KCTP 092117
RWSCTP
PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-
049>053-056>059-063>066-101130-

Regional Weather Summary
National Weather Service State College PA
417 PM EST Tue Dec 9 2025

A deep low moving across the Great Lakes area overnight and
Wednesday will bring a round of winter weather to the Keystone
state.

Several rounds of snow of varying intensity will be across the
northern half of Pennsylvania through Wednesday. The snow is
expected to mix with and change to rain across eastern and
southern areas during the day on Wednesday.

Snow accumulations north of interstate 80 will range anywhere
from 2 to 6 inches, while locations south of interstate 80
generally see a light coating with up to 2 inches in the Laurels.

After the steady precipitation comes to an end, a period of
upslope and lake effect snow showers, some heavy at times, is
possible later Wednesday afternoon into Thursday morning across
portions of western Pennsylvania. Winter weather advisories are in
effect Wednesday and Wednesday night for portions of northern and
western Pennsylvania. Gusty winds will prevail as well.

Lows tonight will vary from the low to mid 20s across central and
eastern sections of the Keystone state, to the lower 30s across
the far west. Highs on Wednesday will range from the mid to upper
30s across much of northern and western Pennsylvania to the lower
40s across the southeastern part of the Keystone state. Lows
Wednesday night will range from the teens across the north and
west, to the mid 20s across the southeast.

$$

Martin

Latest Forecaster's Discussion:

357
FXUS61 KCTP 092029
AFDCTP

Area Forecast Discussion
National Weather Service State College PA
329 PM EST Tue Dec 9 2025

.SYNOPSIS...
* Light snow ends in NW PA; round 2 on the way Wednesday morning
* Windy with wet snow and mixed precipitation Wednesday followed
by lake effect/upslope snow showers through Thursday night
* Periods of snow and below normal temperatures Friday through
the weekend

&&

.NEAR TERM /THROUGH TONIGHT/...
A quick shot of light snow across the NW mtns will end early
this evening. Elsewhere, expect cloudy skies with steady/flat
to slowly rising (non-diurnal) temps overnight as WAA ramps up
ahead of fast moving/intense clipper low racing eastward from
southwest MN to lower MI by 12Z Wednesday. Min temps occur early
tonight in the low to mid 20s.

&&

.SHORT TERM /WEDNESDAY THROUGH WEDNESDAY NIGHT/...
The strong WAA downstream from the clipper low will overrun a
retreating cold antecedent airmass, creating broadening plume of
precip, falling primarily as wet snow across the NW Alleghenies
during the predawn hours impacting the morning commute.
HREF/RRFS model signals suggest a brief period of zr/sleet is
possible along the southeast edge of the precip shield near the
I81 corridor (strongest ice signal is over Schuylkill County).
Later shifts can assess potential for SPS or short-fused winter
wx advisory (low confidence, but non-zero prob of ice glaze).

No significant changes to expected snowfall totals with max
amounts 2-5" over the northern tier/Route 6 corridor. Local max
~6" may be found in the higher terrain in Sullivan County. Snow
rates are projected to be in the 0.50-1 in/hr range in the NW
mtns during the 5-10AM window before shifting eastward across
north central PA toward the Poconos.

Intermittent snow/rain in the valleys along I99/US220 corridor
from Blair/Centre County east along I80/US220 should result in a
slushy coating to 1 inch. There is a scenario where wetbulb
effects help to lock in colder air for a longer duration over
the central ridge/valley region, which may result in a bit more
snow than currently fcst. Temps are expected to rise above the
freezing mark particularly along and southeast of I99/I80
corridor by the afternoon. Temps could stay a few degrees colder
in the northern tier, but road snow will likely become more
limited after midday given the marginal air/road temps.

We expanded the winter wx advisory to include the Laurel
Highlands in coordination with PBZ/LWX. Rain to snow transition
occurring over the course of the day on Wednesday will be
followed by an extended period of orographically enhanced snow
showers with blustery winds through Wednesday night as the
strong storm tracks northeast through the St. Lawrence River
Valley. We could foresee the advisory being extended for the NW
mtns where additional LES accums are expected into Thursday.

Winds increase tomorrow with frequent gusts in the 25-35 mph
range; locally higher gusts up to 40 mph on the Laurel
Highlands. Given the wet character of the snow early on
Wednesday, blowing and drifting impacts are not a concern at
least initially. However, as temps fall into Wednesday night,
expect the character of the snow to become drier or more fluffy
which increases the potential for blowing and drifting over the
higher terrain Wednesday evening through Wednesday night. Wet
surfaces and slush areas will be prone to refreezing and icy
spots overnight Wednesday into early Thursday morning.

&&

.LONG TERM /THURSDAY THROUGH TUESDAY/...
Lake effect snow showers and gusty northwesterly winds continue
on Thursday with additional snow accums expected over the
northwestern mountains and Laurel Highlands. A few long fetch
bands or locally heavy snow showers/squalls are possible on
Thursday and could extend as far southeast as I81.

Winter weather/periods of snow continue from Friday through the
weekend and into early next week with a series of upper troughs
and clippers followed by reinforced cold NW flow and lake
effect/upslope snow showers. Temperatures remain below the
historical average heading into mid-December.

&&

.AVIATION /19Z TUESDAY THROUGH SUNDAY/...
Mainly VFR conds were reported at 19z Tue. An area of stratus
at 3500-4500 ft continues to push across east-central PA. Just
east of the Allegheny Front, most cigs are up near 10,000 feet.
West of the Alleghenies, another area of stratus associated with
a warm front is pushing eastward with cigs near 4000-5000 ft.
The warm front has also produced a few areas of light snow in
western PA. Vsby reductions due to snow are possible at BFD
mainly 19z-00z. Winds during the day will be out of the south at
10 to 15 knots with gusts up to 20 knots.

MVFR ceilings will expand east tonight, likely arriving at JST,
AOO, IPT, and UNV within a couple hours of sunrise. A clipper
system system will bring periods of light to moderate snow to
the region on Wednesday morning and into the afternoon,
initially moving into BFD in the 06-09Z timeframe. Precipitation
will be much lighter south of UNV and east of AOO, but a mix of
rain, snow, and freezing rain is possible at MDT and LNS during
the late morning and early afternoon.

LLWS will also become a factor tonight into Wednesday as a 45-60
knot west-southwesterly LLJ moves into western PA after 00Z
Wednesday. Behind the cold front Wed evening into Thu, winds
will turn out of the west and increase with sfc gusts 15-35 kts
(highest in the Laurels).

Outlook...

Wed night-Thu...Snow showers continue, mainly N/W PA. Windy.

Fri-Sun...Additional rounds of light snow possible with multiple
clipper systems.

&&

.CLIMATE...
Bradford, PA had two records in one night! Their temp of -4F
just before midnight EST on 12/8 broke the previous record of -2F
set in 1970. As the temp continued falling through the night,
they tied the 12/9 record low of -12F at 6 AM EST. This tied the
record set in 2002.

Astronomical winter (solstice) begins at 10:03 a.m. on Sunday,
December 21st.

&&

.CTP WATCHES/WARNINGS/ADVISORIES...
Winter Weather Advisory from 1 AM to 10 PM EST Wednesday for
PAZ004>006-010>012-017-018.
Winter Weather Advisory from 10 AM Wednesday to 10 AM EST
Thursday for PAZ024-033.
Winter Weather Advisory from 3 AM to 10 PM EST Wednesday for
PAZ037-041-042.

&&

$$

SYNOPSIS...Steinbugl
NEAR TERM...Steinbugl
SHORT TERM...Steinbugl
LONG TERM...Lambert/Steinbugl
AVIATION...Colbert/Bauco
CLIMATE...Colbert

Latest Public Information Statement:

615
NOUS41 KCTP 052226
PNSCTP
PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-049>053-
056>059-063>066-060321-

Public Information Statement
National Weather Service State College PA
530 PM EST Fri Dec 5 2025

...LOW TEMPERATURE RECORDS SET AT BRADFORD AND ALTOONA...

A RECORD LOW TEMPERATURE OF 12 DEGREES HAS BEEN SET AT ALTOONA TODAY
DECEMBER 5TH. THIS BREAKS THE OLD RECORD OF 13 DEGREES SET IN 1966.

A RECORD LOW TEMPERATURE OF -8 DEGREES HAS BEEN SET AT BRADFORD
TODAY DECEMBER 5TH. THIS BREAKS THE OLD RECORD OF 0 DEGREES SET IN
2007.

$$

MMD