York, Pennsylvania 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

901
FXUS61 KCTP 150522
AFDCTP

Area Forecast Discussion
National Weather Service State College PA
122 AM EDT Wed Oct 15 2025

.SYNOPSIS...
* Dry conditions through Thursday, with temperatures tipping
  slightly below climatological averages.
* Above average temperatures begin Friday and continue into the
  weekend, with increasing rain chances this weekend.

&&

.NEAR TERM /UNTIL 8 AM THIS MORNING/...
Some fog is forming in the valleys in the N due to the light
wind and clear sky. Have added fog into many of the usual
valleys in the CWA. But, it shouldn`t get widespread since there
should be an increase in clouds and decrease in dewpoints. There
could also be perhaps a bit more wind as the cold front moves
through. Otherwise, those clouds in the far E are going away,
just a little slower than earlier expectations.

Prev...
Skies have cleared save for some patches of low clouds in the
far NW and the very back edge of clouds from earlier today in
the far E. The cold front is extremely dry, and tough to find.
The drier air as judged by mid-40 dewpoints are in Canada, but
even a couple of spots in the CWA are dipping into the 40s, now.
No moisture pooling and barely clouds over wrn NY and LE lend
high confidence to a dry forecast as the front passes through
tonight.

Prev...
Clearing skies are expected overnight, with radiational cooling
across the western half of the forecast area with high
confidence, allowing for low temperatures into Wednesday
morning dipping into the upper 30s to lower 40s. Slightly more
uncertainty with regards to the cold frontal passage timing
across southeastern Pennsylvania, thus cooling might not be as
efficient with low temperatures into the lower 50s. These low
temperatures will generally be above-average for the middle of
October across all of central Pennsylvania.

&&

.SHORT TERM /8 AM THIS MORNING THROUGH THURSDAY NIGHT/...
Relatively cool temperatures are progged through the middle
part of the week behind the cold front, with dry air allowing
for no precipitation mentions through Thursday. Cool overnight
periods will bring about frost/freeze concerns, mainly Thursday
night into Friday, across the Lower Susquehanna Valley where
seven zones remain in the growing season (see latest PNSCTP for
update on growing season). Confidence on frost/freeze concerns
across the Lower Susquehanna Valley warrants continued mentions
in the HWO and will need to be monitored over the next few
forecast cycles for headline decisions.

Daytime dryness will peak on Thursday with room for downside to
minRH in the 25-35% range. 20-25 mph wind gusts particularly
over the eastern portion of the area could create some concern
for fire weather partners depending on how quickly dead fine
fuels can cure post the cool/wet/dank Columbus Day and weekend
rainfall.

&&

.LONG TERM /FRIDAY THROUGH TUESDAY/...
Little change in the long-term forecast cycle for the Tuesday
afternoon update. Departing high pressure will allow for mostly
dry conditions through Saturday; however, a slight increase in
moisture has been progged by some model guidance Saturday
morning, allowing for slight chances of precipitation to be
introduced in this timeframe. Better chances for precipitation
comes on Sunday and into the beginning of next week.

Previous Discussion, Issued 3:51 AM EDT 10/14/2025:
Mild trend ramps through the weekend with max temps 65-75F
behind an increasing southerly return flow on the backside of
departing sfc high pressure. Latest model data continues to
favor dry/rain-free wx through Saturday.

Strong upper trough and well defined frontal system should tap
Gulf moisture moving east of the Mississippi River. This system
will most likely bring rain/showers to CPA Sunday through Sunday
night/early Monday. Timing could easily shift +/- 12hr with GFS
and EC showing their typical fast/slow bias at this range, but
overall the models are in pretty good agreement showing the
frontal rainfall on Sunday transitioning to a cooler, breezy
post-frontal NW flow to begin next week.

&&

.AVIATION /06Z WEDNESDAY THROUGH SUNDAY/...
Most of the area now clear. Some lower CIGS still at BFD.

Winds kicking up at times across the higher elevation sites
of BFD, JST, and AOO. However, winds likely to weaken again as
temperatures cool more.

Expect skies to clear at BFD at mid morning, as a cold front
drops southward today, and drier air works into the area.
Also the pressure gradient increases, so winds will become
gusty at times later today.

Not looking at much cloud cover offf the lakes later today and
overnight tonight, given the low level flow is from the
northeast, and the colder air is not very deep.

Expect winds to become gusty again on Thursday, given the
gradient.

Outlook...

Thu...VFR, still breezy.

Fri-Sat... VFR

Sun...Restrictions possible in SHRA. Low probability of a
thunderstorm over northwest PA.

&&

.CTP WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

SYNOPSIS...NPB
NEAR TERM...Dangelo/NPB
SHORT TERM...Steinbugl/NPB
LONG TERM...Steinbugl/NPB
AVIATION...Martin