887
FXUS61 KCTP 081927
AFDCTP

Area Forecast Discussion
National Weather Service State College PA
327 PM EDT Wed Oct 8 2025

.SYNOPSIS...
* Crisp and seasonable Fall conditions through late week
* Frost/freeze conditions tonight and Thursday night could end
  the growing season in some parts of central PA
* Increasing odds for cloudy/wet/windy weather Sunday into
  Monday particularly across the eastern part of the forecast
  area

&&

.NEAR TERM /THROUGH TONIGHT/...
Instability cu should crumble with the loss of daytime heating
through the evening, giving way to clear skies overnight. A
seasonably strong +2SD 1030mb high pressure dome will migrate
over the eastern Great Lakes and continue to direct crisp and
chilly Fall air into CPA. Frost/freeze headlines remain
unchanged over the northern and western Alleghenies. Some
consideration was given toward adding counties along I-99 where
the usually colder valleys could wake up to areas of frost early
Thursday morning. Min temps in 30-45F range anywhere from 1-2 to
5-8 degrees below climo; however the 24hr change is a bit more
impressive at 15 to 25 degrees lower (colder) vs. last night.

&&

.SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/...
Chilly start followed by abundant sunshine, lighter winds, and
the first cooler-than-average day in some time. Max temps will
be 5-10 degrees below the historical average for early October
making for a crisp, cool Autumn feel with low humidity.

1030+mb high pressure dome with PW <0.4" continues to drift to
the southeast into the Northeast US and channels down the
eastside of the Appalachians, setting up an ideal radiational
cooling pattern Thursday night into early Friday morning.

This should translate into the coldest night/morning of the
season so far with widespread frost and areas of sub-freezing
temperatures that could bring an end to the growing season.
Freeze watch remains well-positioned/unchanged with frost advy
considerations for the lower Susquehanna Valley.

Predawn/sunrise min temps in the 20-40 range should mark a short
term bottom with highs/lows moderating into the weekend in
response to veering low level flow - turning more to the south
southeast as the aforementioned high shifts off the New England
coast.

The latest model data is now trending toward a closed/cutoff
upper low over the Great Lakes by 12Z Saturday which could
introduce low end rain probs across far northwest PA. This
feature will also play a key role in the pattern taking shape
over the weekend into early next week.

&&

.LONG TERM /SATURDAY THROUGH WEDNESDAY/...
Saturday is trending toward more clouds and increasing rain
probs over southeast PA. Conditions on Sunday are also trending
downhill as the 08/12Z models continue to like the idea of
moisture being pulled north/northwest as the Great Lakes upper
low interacts with the Carolina coastal storm. Rain and perhaps
breezy/windy conditions may impact at least the southeast
portion of the forecast area Sunday into early next week.

Weather conditions should improve on the margin into the middle
of next week as the coastal low moves out to sea, but the exact
timing is still uncertain.

&&

.AVIATION /18Z WEDNESDAY THROUGH MONDAY/...
Widespread VFR prevails through late week under the influence of
seasonably strong high pressure dome. Fog remains highly
unlikely with very dry air in place.

Outlook...

Thu-Fri...VFR.

Sat-Mon...Low clouds and rain/wind potential increasing
particularly over the southeast airfields as coastal storm
tracks north.

&&

.CTP WATCHES/WARNINGS/ADVISORIES...
Frost Advisory from 1 AM to 9 AM EDT Thursday for PAZ004-006-
010-011-017-024-033-037.
Freeze Watch from Thursday evening through Friday morning for
PAZ004>006-010>012-017>019-024>028-033>035-037-041-042-045-046-
049>053-058.
Freeze Warning from 1 AM to 9 AM EDT Thursday for PAZ005.

&&

$$

SYNOPSIS...Steinbugl
NEAR TERM...Steinbugl
SHORT TERM...Steinbugl
LONG TERM...Steinbugl
AVIATION...Steinbugl