Special Weather Statement, NWS State College, PA

Area Forecast Discussion
National Weather Service State College PA
202 PM EDT Wed Jul 21 2021

.SYNOPSIS...
A cold front is sweeping through central Pennsylvania,
producing showers and thunderstorms. Behind the front, cooler
and refreshingly less humid conditions are expected for the rest
of the work week before heat and humidity make a comeback for
the weekend. Rain chances will also increase by late Saturday
and Sunday.

&&

.NEAR TERM /UNTIL 9 PM THIS EVENING/...
SVR tstm watch continue for a few more hours, but we will likely
be able to trim it back very soon, and chop it off completely
from the CWA by/around 4 PM. Main cluster of storms is dropping
toward Lancaster Co, where it has been pretty sunny all day and
dewpoints are still in the m60s. CAPE there is 2000+. It will,
as usual, linger longest there in Lanc Co. The storms have been
producing pea size hail and gusts of around 50 MPH. A thin line
of showers is also moving thru the northern mtns and nearing
I-80. No ltg is likely to occur with that stuff, as it is too
shallow. However, we can't rule out a rumble. That line appears
to be one in a number of fronts/troughs which will pass through.
The really dry air mass is nosing into the nrn tier right now,
and will make it refreshingly less humid in just a few hours.

&&

.SHORT TERM /9 PM THIS EVENING THROUGH 6 PM THURSDAY/...
Cooler and drier air mass builds across the central PA tonight
and Thursday with comfortable humidity and river valley fog
confined to the deepest northern valleys. The drier air moving
in will help to mix away the moisture from the rainfall today.
A patch of lower clouds is possible over the Alleghenies
tonight, which could play with the temps. However, BFD should
drop quickly in the dry airmass, and still get AOB 50F. Mins
will range from u40s over the north to near 60F SE.

High pressure will build in from the Ohio Valley on Thursday,
bringing plenty of sunshine and mild temperatures ranging from
the m70s in the north and Laurels to the l-m80s in southeastern
PA. Dewpoints in the u40s-l50s will feel quite refreshing. The
haziness of the moisture and smoke of the past few days may
improve/get less hazy on Thursday.

&&

.LONG TERM /THURSDAY NIGHT THROUGH WEDNESDAY/...
A warm front will slowly approach from the west beginning on
Fri, bringing with it a slight chance of showers and storms to
the NW. The warm front will advance across the rest of PA on
Saturday, again bringing a chance for isolated showers and
storms, but very dry midlevel air will keep coverage limited and
widespread rainfall does not appear likely.

Moisture will flow back into the area on Sunday, with dewpoints
rising to 65-70F and temperatures returning to the 80-90F range.
Increased moisture and instability along with a weak disturbance
aloft will likely lead to more widespread showers/storms Sun
afternoon and evening.

Warm and humid conditions will continue into early next week
with a chance for additional rounds of showers and storms as
weak upper shortwave troughs pivot around a large ridge of high
pressure set up over the central US.

&&

.AVIATION /18Z WEDNESDAY THROUGH MONDAY/...
Expect improving cigs across the Allegheny Plateau later
today, as drier air arrives on northwest flow. Model soundings
and ensemble prob charts support widespread VFR conditions by
Wed afternoon. However, can't rule out a gusty tstorm forming on
exiting cold front across central and southeast PA sometime
between 16-18Z.

Outlook...

Thu...AM valley fog possible W Mtns.

Fri...No sig wx expected.

Sat...Late day tsra impacts possible, mainly west.

Sun...AM low cigs possible W Mtns. PM tsra impacts possible.

&&

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

&&

SYNOPSIS...DeVoir/Banghoff
NEAR TERM...DeVoir/Dangelo/Colbert/Wagner
SHORT TERM...DeVoir/Colbert/Wagner
LONG TERM...Colbert/Travis
AVIATION...Fitzgerald/Gutierrez

Hazardous Weather Outlook
National Weather Service State College PA
225 PM EDT Wed Jul 21 2021

PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-049>053-
056>058-063-064-221830-
Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Clearfield-
Northern Centre-Southern Centre-Cambria-Blair-Huntingdon-Mifflin-
Juniata-Somerset-Bedford-Fulton-Franklin-Tioga-Northern Lycoming-
Sullivan-Southern Clinton-Southern Lycoming-Union-Snyder-Montour-
Northumberland-Columbia-Perry-Dauphin-Schuylkill-Cumberland-Adams-
225 PM EDT Wed Jul 21 2021

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...This afternoon and tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

PAZ059-065-066-221830-
Lebanon-York-Lancaster-
225 PM EDT Wed Jul 21 2021

...SEVERE THUNDERSTORM WATCH 385 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...This afternoon and tonight.

Please listen to NOAA Weather Radio or go to
weather.gov/StateCollege on the internet for more
information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report significant hazardous weather.

Special Weather Statement
National Weather Service State College PA
252 PM EDT Wed Jul 21 2021

PAZ065-066-211930-
Lancaster PA-York PA-
252 PM EDT Wed Jul 21 2021

...A STRONG THUNDERSTORM WILL AFFECT PARTS OF LANCASTER AND YORK
COUNTIES UNTIL 330 PM EDT...

At 252 PM EDT, Doppler radar indicated a strong thunderstorm over
Yorkana, moving southeast at 25 mph.

Pea size hail and wind gusts of 50 to 55 mph are possible.

Locations impacted include...
Windsor, Yorkana, Shenks Ferry, Brogue, Safe Harbor, East Prospect
and Airville.

LAT...LON 3995 7662 4000 7657 3991 7628 3978 7641
TIME...MOT...LOC 1852Z 303DEG 21KT 3995 7655

Banghoff

Special Weather Statement
National Weather Service State College PA
253 PM EDT Wed Jul 21 2021

PAZ019-045-049-211930-
Southern Clinton PA-Union PA-Southern Centre PA-
253 PM EDT Wed Jul 21 2021

...A STRONG THUNDERSTORM WILL AFFECT PARTS OF SOUTHERN CLINTON...
UNION...AND SOUTHERN CENTRE COUNTIES UNTIL 330 PM EDT...

At 253 PM EDT, Doppler radar indicated a strong thunderstorm near
Mackeyville, moving south at 30 mph.

Penny size hail and wind gusts up to 50 mph are possible.

Locations impacted include...
Woodward, Laurelton Center and Loganton.

LAT...LON 4092 7716 4084 7736 4085 7737 4084 7740
      4108 7746 4114 7730
TIME...MOT...LOC 1853Z 340DEG 25KT 4106 7739

Travis

Special Weather Statement
National Weather Service State College PA
325 PM EDT Wed Jul 21 2021

PAZ064-065-212000-
York PA-Adams PA-
325 PM EDT Wed Jul 21 2021

...A STRONG THUNDERSTORM WILL AFFECT PARTS OF YORK AND ADAMS COUNTIES
UNTIL 400 PM EDT...

At 325 PM EDT, Doppler radar indicated a strong thunderstorm over New
Oxford, moving southeast at 20 mph.

Pea size hail and wind gusts of 50 to 55 mph are possible.

Locations impacted include...
Hanover, Parkville, Hampton, Codorus, McSherrystown, Pennville, New
Oxford, East Berlin and Abbottstown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3972 7701 3991 7713 3996 7703 3981 7677
      3972 7696
TIME...MOT...LOC 1925Z 315DEG 18KT 3989 7704

Banghoff

Special Weather Statement
National Weather Service State College PA
400 PM EDT Wed Jul 21 2021

PAZ065-212045-
York PA-
400 PM EDT Wed Jul 21 2021

...A STRONG THUNDERSTORM WILL AFFECT PARTS OF YORK COUNTY UNTIL 445
PM EDT...

At 400 PM EDT, Doppler radar indicated a strong thunderstorm over
Glen Rock, moving southeast at 20 mph.

Pea size hail and wind gusts of 50 to 55 mph are possible.

Locations impacted include...
Shrewsbury, Stewartstown, Glen Rock, Jacobus, Cross Roads, Railroad,
Loganville, Winterstown, Fawn Grove and Glenville.

LAT...LON 3988 7672 3973 7635 3972 7636 3972 7693
TIME...MOT...LOC 2000Z 309DEG 18KT 3980 7671

Banghoff

Special Weather Statement
National Weather Service State College PA
402 PM EDT Wed Jul 21 2021

PAZ050-052-057-212030-
Northumberland PA-Dauphin PA-Snyder PA-
402 PM EDT Wed Jul 21 2021

...A STRONG THUNDERSTORM WILL AFFECT PARTS OF NORTHUMBERLAND...
DAUPHIN...AND SNYDER COUNTIES UNTIL 430 PM EDT...

At 402 PM EDT, Doppler radar indicated a strong thunderstorm over
Mount Pleasant Mills, moving southeast at 25 mph.

Pea size hail and wind gusts of 50 to 55 mph are possible.

Locations impacted include...
Millersburg, Port Trevorton, Mount Pleasant Mills, Urban,
Meiserville, Fremont, Freeburg, Dalmatia, Berrysburg, Herndon and
Pillow.

LAT...LON 4065 7669 4054 7694 4058 7697 4059 7696
      4062 7696 4064 7694 4065 7695 4064 7700
      4066 7701 4066 7703 4073 7708 4080 7702
TIME...MOT...LOC 2002Z 314DEG 22KT 4072 7700

Banghoff

Special Weather Statement
National Weather Service State College PA
427 PM EDT Wed Jul 21 2021

PAZ052-057>059-212100-
Northumberland PA-Lebanon PA-Dauphin PA-Schuylkill PA-
427 PM EDT Wed Jul 21 2021

...STRONG THUNDERSTORMS WILL AFFECT PARTS OF NORTHUMBERLAND...
LEBANON...DAUPHIN...AND SCHUYLKILL COUNTIES UNTIL 500 PM EDT...

At 426 PM EDT, Doppler radar indicated strong thunderstorms along a
line extending from Lavelle to near Elizabethville. Movement was
southeast at 30 mph.

Penny size hail and wind gusts of 50 to 55 mph are possible.

Locations impacted include...
Pottsville, Colonial Park, Progress, Linglestown, Mount Carmel,
Schuylkill Haven, Minersville, Kulpmont, Ashland, Paxtonia, Skyline
View, Valley View, Millersburg, Pine Grove, Lykens, Tremont,
Elizabethville, Williamstown, Fredericksburg and Tower City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4053 7617 4052 7626 4052 7634 4049 7644
      4046 7638 4029 7687 4060 7696 4082 7641
      4081 7639 4077 7638 4078 7636 4057 7607
TIME...MOT...LOC 2026Z 328DEG 27KT 4077 7640 4060 7688

Banghoff