Latest PA Weather Summary:
901
AWUS81 KCTP 172054
RWSCTP
PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-
049>053-056>059-063>066-181100-
Regional Weather Summary
National Weather Service State College PA
454 PM EDT Mon Aug 17 2026
Widely scattered showers and storms will continue to move
southeast this evening, as a cold front moves south of the
Keystone state overnight.
Clearing skies late will result in patchy fog. Lows will
range from the mid 50s to lower 60s across the north and
west, to the mid 60s across the southeast.
Weak high pressure will bring a sunny and much less humid
day on Tuesday. Highs will range from the mid to upper 70s
across the north and west, to the mid to upper 80s across
the southeast. Lows Tuesday night will be mainly in the 50s.
Temperatures on Wednesday will be similar to those on Tuesday.
Showers and storms will move into the Lake Erie shoreline
region Wednesday morning, and into western and northern portions
of Pennsylvania during the afternoon hours.
$$
Martin
Latest Forecaster's Discussion:
977
FXUS61 KCTP 172356
AFDCTP
Area Forecast Discussion
National Weather Service State College PA
756 PM EDT Mon Aug 17 2026
.WHAT HAS CHANGED...
* Keeping an eye on rain amounts/intensity in the SW.
&&
.KEY MESSAGES...
1) Numerous showers ahead of a cold front will die off as we
lose the heating of the sun.
2) An unsettled but not particularly wet period is expected mid
to late week.
&&
.DISCUSSION...
KEY MESSAGE 1: Numerous showers ahead of a cold front will die
off as we lose the heating of the sun.
The cold front is advancing through northern PA showing up as
thin line of shallow convectionm at 3 PM. The air behind the
front is not all that dry, but enough of a change should take
place that those in nrn PA should notice tonight and Tuesday.
The immediate showers and a couple of thunderstorms out ahead
of the front in the 68-71F dewpoint airmass seem to be moving
along consistently/quickly. But, some training is starting to
occur. We`ll have to keep an eye on the radar and radar/gauge
estimates to exceed FFG. But, thus far, the heaviest rates do
not get to that level of worry. Not thinking of a flood watch at
this point with the threat sub-concerning. The stronger forcing
will linger over the NE counties early this evening, but most of
this convection will die off around sunset.
------------------------------------------------------
KEY MESSAGE 2: An unsettled but not particularly wet period is
expected mid to late week.
After a dry 36 hrs tonight thru Wed AM, a short wave trough
rotating around the base of the deep upper low over Hudson &
James Bays. It will be the next help to lift and destabilize the
air over PA. Expect some showers to impinge upon Warren Co in
the aftn on Wed and spread along the NY border. Some of them
could advance another county to the south before daylight wanes
and they die off. Precip chcs Wed night and Thurs AM now look a
little lower than previous forecasts. But, isolated showers are
still possible then. Heights do dip for real on Thursday/night
and will probably develop a weak low pressure system to our
south. That low will push east to the sea Friday. Some light to
moderate rain should overrun the boundary to our south and make
the southern half of the CWA wet - but not too wet - on Thurs
night and early Friday. Model agreement lowers for the weekend,
clouding the crystal ball. PoPs end up at 40-50% Sat and Sun
without confidence in the forecast being either wet or dry.
&&
.AVIATION /00Z TUESDAY THROUGH SATURDAY/...
After a few strong storms across the middle and lower
Susquehanna Valley late this afternoon, only a few showers
left from northeastern PA to southwestern PA. Expect this
activity to slowly weaken. Dewpoints still very high to the
east and south, was a hot and humid afternoon down that way,
thus expect that area to be the last to see the activity
taper off.
Once skies clear out more and winds weaken, expect fog
overnight, as fcst temperatures drop toward the fcst dewpoints.
Spots like UNV that got a heavier shower this afternoon will be
the more likely spots to get dense fog.
Expect conditions to improve Tuesday morning, once the sun is
up. Still warm on Tuesday, but with some breeze and lower
dewpoints, expect conditions to be VFR all areas by mid morning.
Warm advection on Wednesday will bring a chance of showers and
storms to the area later in the afternoon and overnight.
Outlook...
Wed... VFR conditions with restrictions from afternoon SHRA/TSRA
possible in the northwest early.
Thu... Afternoon SHRA/TSRA with brief restrictions possible.
Otherwise, VFR conditions.
Fri...Chance of SHRA across the south, restrictions possible,
otherwise dry.
Sat...Chance of SHRA statewide, restrictions possible.
&&
.CTP WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
WHAT HAS CHANGED...Dangelo
KEY MESSAGES...Dangelo
DISCUSSION...Dangelo
AVIATION...Martin/Lambrech
Latest Public Information Statement:
251
NOUS41 KCTP 111338
PNSCTP
PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-049>053-056>059-
063>066-120138-
Public Information Statement
National Weather Service State College PA
938 AM EDT Tue Aug 11 2026
...24-HOUR PRECIPITATION REPORTS 1 INCH OR MORE...
Location Amount Time/Date Provider
...Pennsylvania...
...Adams County...
Fairfield 1.8 NNW 1.64 in 0600 AM 08/11 COCORAHS
Fairfield 1.0 NNE 1.50 in 0800 AM 08/11 COCORAHS
Fairfield 2.0 SSW 1.14 in 0800 AM 08/11 COCORAHS
...Centre County...
Bellefonte 7.1 ENE 1.96 in 0730 AM 08/11 COCORAHS
Bellefonte 7.1 ENE 1.75 in 0900 AM 08/11 COCORAHS
...Franklin County...
New Franklin 1.21 in 0915 AM 08/11 CWOP
Chambersburg 1.13 in 0915 AM 08/11 AWS
Waynesboro 1.8 ESE 1.10 in 0700 AM 08/11 COCORAHS
Waynesboro 1.05 in 0920 AM 08/11 CWOP
...Lycoming County...
Duboistown 1.86 in 0917 AM 08/11 CWOP
Williamsport 2.3 WNW 1.36 in 0600 AM 08/11 COCORAHS
...McKean County...
Bradford 5SW 1.60 in 0800 AM 08/11 COOP
Smethport 1.10 in 0915 AM 08/11 CWOP
...Mifflin County...
Lewistown 1.16 in 0600 AM 08/11 COOP
...Northumberland County...
Muncy 4.7 SSE 1.39 in 0700 AM 08/11 COCORAHS
...Potter County...
Roulette 1.8 NNE 1.42 in 0700 AM 08/11 COCORAHS
Coudersport 2.0 N 1.12 in 0755 AM 08/11 COCORAHS
...Somerset County...
5 W Casselman 4.58 in 0932 AM 08/11 Public
Rockwood 4.3 W 3.52 in 0711 AM 08/11 COCORAHS
Meyersdale 2.50 in 0918 AM 08/11 CWOP
Somerset 2.17 in 0917 AM 08/11 CWOP
Somerset 1.93 in 0800 AM 08/11 COOP
Central City 1.60 in 0916 AM 08/11 CWOP
Friedens 1.9 WSW 1.58 in 0800 AM 08/11 COCORAHS
Hidden Valley 0.3 ENE 1.52 in 0500 AM 08/11 COCORAHS
Hidden Valley 1.52 in 0500 AM 08/11 COOP
Somerset 1.33 in 0920 AM 08/11 CWOP
Berlin 3.1 NW 1.07 in 0700 AM 08/11 COCORAHS
...Tioga County...
Westfield 1.26 in 0915 AM 08/11 CWOP
...Warren County...
Kinzua 1.16 in 0622 AM 08/11 RAWS
Russell 0.7 S 1.03 in 0800 AM 08/11 COCORAHS
...York County...
2 SSW York 1.59 in 0839 AM 08/11 AWS
Dover 2.2 E 1.38 in 0500 AM 08/11 COCORAHS
York 1.38 in 0905 AM 08/11 CWOP
York 4.3 WNW 1.26 in 0700 AM 08/11 COCORAHS
Shiloh 1.2 W 1.16 in 0700 AM 08/11 COCORAHS
&&
...24-HOUR MAXIMUM PRECIPITATION REPORTS...
Location Amount Time/Date Provider
5 W Casselman 4.58 in 0932 AM 08/11 Public
Rockwood 4.3 W 3.52 in 0711 AM 08/11 COCORAHS
Meyersdale 2.50 in 0918 AM 08/11 CWOP
Somerset 2.17 in 0917 AM 08/11 CWOP
Bellefonte 7.1 ENE 1.96 in 0730 AM 08/11 COCORAHS
Somerset 1.93 in 0800 AM 08/11 COOP
&&
**METADATA**
:8/11/2026,0800 AM, PA, Adams, Fairfield 2.0 SSW, , , 39.7594, -77.3794, RAIN_24, 1.14, Inch, COCORAHS, 24 hour rainfall,
:8/11/2026,0800 AM, PA, Adams, Fairfield 1.0 NNE, , , 39.8011, -77.3606, RAIN_24, 1.5, Inch, COCORAHS, 24 hour rainfall,
:8/11/2026,0600 AM, PA, Adams, Fairfield 1.8 NNW, , , 39.8134, -77.3764, RAIN_24, 1.64, Inch, COCORAHS, 24 hour rainfall,
:8/11/2026,0900 AM, PA, Centre, Bellefonte 7.1 ENE, , , 40.9453, -77.639, RAIN_24, 1.75, Inch, COCORAHS, 24 hour rainfall,
:8/11/2026,0730 AM, PA, Centre, Bellefonte 7.1 ENE, , , 40.9557, -77.6447, RAIN_24, 1.96, Inch, COCORAHS, 24 hour rainfall,
:8/11/2026,0920 AM, PA, Franklin, WAYNESBORO, , , 39.7333, -77.55, RAIN_24, 1.05, Inch, CWOP, 24 hour rainfall,
:8/11/2026,0700 AM, PA, Franklin, Waynesboro 1.8 ESE, , , 39.7429, -77.5514, RAIN_24, 1.1, Inch, COCORAHS, 24 hour rainfall,
:8/11/2026,0915 AM, PA, Franklin, Chambersburg, , , 39.9283, -77.6694, RAIN_24, 1.13, Inch, AWS, 24 hour rainfall,
:8/11/2026,0915 AM, PA, Franklin, New Franklin, , , 39.8663, -77.6068, RAIN_24, 1.21, Inch, CWOP, 24 hour rainfall,
:8/11/2026,0600 AM, PA, Lycoming, Williamsport 2.3 WNW, , , 41.2538, -77.078, RAIN_24, 1.36, Inch, COCORAHS, 24 hour rainfall,
:8/11/2026,0917 AM, PA, Lycoming, Duboistown, , , 41.2223, -77.0415, RAIN_24, 1.86, Inch, CWOP, 24 hour rainfall,
:8/11/2026,0915 AM, PA, McKean, Smethport, , , 41.8833, -78.4929, RAIN_24, 1.1, Inch, CWOP, 24 hour rainfall,
:8/11/2026,0800 AM, PA, McKean, Bradford 5SW, , , 41.898, -78.7143, RAIN_24, 1.6, Inch, COOP, 24 hour rainfall,
:8/11/2026,0600 AM, PA, Mifflin, Lewistown, , , 40.5833, -77.5667, RAIN_24, 1.16, Inch, COOP, 24 hour rainfall,
:8/11/2026,0700 AM, PA, Northumberland, Muncy 4.7 SSE, , , 41.1361, -76.7651, RAIN_24, 1.39, Inch, COCORAHS, 24 hour rainfall,
:8/11/2026,0755 AM, PA, Potter, Coudersport 2.0 N, , , 41.8033, -78.0169, RAIN_24, 1.12, Inch, COCORAHS, 24 hour rainfall,
:8/11/2026,0700 AM, PA, Potter, Roulette 1.8 NNE, , , 41.8076, -78.1414, RAIN_24, 1.42, Inch, COCORAHS, 24 hour rainfall,
:8/11/2026,0700 AM, PA, Somerset, Berlin 3.1 NW, , , 39.9546, -78.9928, RAIN_24, 1.07, Inch, COCORAHS, 24 hour rainfall,
:8/11/2026,0920 AM, PA, Somerset, Somerset, , , 40.0738, -79.17, RAIN_24, 1.33, Inch, CWOP, 24 hour rainfall,
:8/11/2026,0500 AM, PA, Somerset, Hidden Valley 0.3 ENE, , , 40.0584, -79.2616, RAIN_24, 1.52, Inch, COCORAHS, 24 hour rainfall,
:8/11/2026,0500 AM, PA, Somerset, Hidden Valley, , , 40.042, -79.2566, RAIN_24, 1.52, Inch, COOP, 24 hour rainfall,
:8/11/2026,0800 AM, PA, Somerset, Friedens 1.9 WSW, , , 40.0365, -79.0398, RAIN_24, 1.58, Inch, COCORAHS, 24 hour rainfall,
:8/11/2026,0916 AM, PA, Somerset, Central City, , , 40.0193, -78.8475, RAIN_24, 1.6, Inch, CWOP, 24 hour rainfall,
:8/11/2026,0800 AM, PA, Somerset, Somerset, , , 40, -79.0833, RAIN_24, 1.93, Inch, COOP, 24 hour rainfall,
:8/11/2026,0917 AM, PA, Somerset, Somerset, , , 39.988, -79.1878, RAIN_24, 2.17, Inch, CWOP, 24 hour rainfall,
:8/11/2026,0918 AM, PA, Somerset, Meyersdale, , , 39.8118, -79.0285, RAIN_24, 2.5, Inch, CWOP, 24 hour rainfall,
:8/11/2026,0711 AM, PA, Somerset, Rockwood 4.3 W, , , 39.9215, -79.2377, RAIN_24, 3.52, Inch, COCORAHS, 24 hour rainfall,
:8/11/2026,0932 AM, PA, Somerset, 5 W Casselman, , , 39.88536183029, -79.305282242121, RAIN, 4.58, Inch, Public, Storm total rainfall,
:8/11/2026,0915 AM, PA, Tioga, Westfield, , , 41.9128, -77.5468, RAIN_24, 1.26, Inch, CWOP, 24 hour rainfall,
:8/11/2026,0800 AM, PA, Warren, Russell 0.7 S, , , 41.9313, -79.138, RAIN_24, 1.03, Inch, COCORAHS, 24 hour rainfall,
:8/11/2026,0622 AM, PA, Warren, Kinzua, , , 41.9006, -79.1186, RAIN_24, 1.16, Inch, RAWS, 24 hour rainfall,
:8/11/2026,0700 AM, PA, York, Shiloh 1.2 W, , , 39.9722, -76.8148, RAIN_24, 1.16, Inch, COCORAHS, 24 hour rainfall,
:8/11/2026,0700 AM, PA, York, York 4.3 WNW, , , 39.9817, -76.8103, RAIN_24, 1.26, Inch, COCORAHS, 24 hour rainfall,
:8/11/2026,0500 AM, PA, York, Dover 2.2 E, , , 40.002, -76.808, RAIN_24, 1.38, Inch, COCORAHS, 24 hour rainfall,
:8/11/2026,0905 AM, PA, York, York, , , 39.9192, -76.7102, RAIN_24, 1.38, Inch, CWOP, 24 hour rainfall,
:8/11/2026,0839 AM, PA, York, 2 SSW York, , , 39.9275, -76.7453, RAIN_24, 1.59, Inch, AWS, 24 hour rainfall,
Observations are collected from a variety of sources with varying
equipment and exposures. We thank all volunteer weather observers
for their dedication. Not all data listed are considered official.
$$
MRS
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