Special Weather Statement, NWS State College, PA

Area Forecast Discussion
National Weather Service State College PA
1213 PM EDT Wed Sep 15 2021

.SYNOPSIS...
Scattered strong to severe thunderstorms capable of locally
damaging winds and hail are possible this afternoon and evening.
Late summer/early fall warmth and elevated humidity levels will
maintain a low risk of isolated showers and thunderstorms from
late week into the weekend. An extended period of dry weather
with above average temperatures is highly probable from Sunday
through Tuesday.

&&

.NEAR TERM /THROUGH TONIGHT/...
12PM/16Z: Severe Thunderstorm Watch #501 issued until 8PM EDT
for most of Central PA. Present indications are that the severe
threat will begin soon and spread across the southeast 3/4 of
the CWA this afternoon and evening. Convective intensity trends
should generally follow the diurnal cycle with risk ending by
00Z. Model guidance is bullish on low stratus and fog developing
late tonight into early Thursday morning.

11AM/15Z: 95% probability of watch issuance by 16-17Z per SPC
MCD #1753.

10AM/14Z: Fog has mixed out across the central and eastern
valleys. Vis sat loop shows multi-layer clouds covering the
northwest 1/2 of the CWA in advance of sfc cold front which has
advanced southeast of KERI-KCLE. Hires models continue to show
an increasing trends in pre-frontal convection with potential
for two main bands: 1) along the actual cold front and 2) within
lee trough axis near or southeast of I-99/US220 corridor. Full
sunshine over the central and eastern part of the CWA will
ensure ample instability and steep low level lapse rates with
wind profiles supportive of northeastward-moving bands/bowing
segments. Damaging winds will likely be the most common hazard.
SPC made no changes to the updated 13Z Day 1 SWO.

Previous Discussion Issued: 534 AM EDT Wed Sep 15 2021

09Z radar loop shows a dwindling band of convection moving into
northwest Pa in advance of a cold front, which is pushing across
Lk Erie. Bulk of guidance tracks surface cold front from the northwest
edge of the forecast area at 12Z to the southeast corner by
evening. Upscale linear growth appears likely as the front
pushes into the central mountains around midday, as progged
winds aloft are nearly parallel to the front. However, decent
0-6km shear and steepening sfc-3km lapse rates should help a few
of these linear segments to organize/grow and thus exhibit the
potential for damaging wind gusts. SPC D2 SWO continues to
highlight a SLGT risk area (level 2 out of 5) across the central
2/3 of the CWA.

High pwats, instability and potential for training storms
tracking southwest to northeast could yield some locally
excessive, quick-hitting rain totals. The 15/00Z HREF supports
the possibility of localized 2-3 inches amounts, mainly in a
band from the Laurel Highlands into the Middle Susq Valley.
Given the low FFG values and above normal soil moisture, this
amount of rain over a short duration could result in some
flooding issues.

A good deal of pre-frontal sunshine should push temperatures
into the mid 80s across the Lower Susq Valley, while an earlier
arrival of clouds/showers results in a significantly cooler day
further north and west with highs around 70F over the northwest
mountains.

Conditions should dry out across the NW half of the forecast
area by this evening. However, lingering post-frontal showers
are expected further southeast in region of fgen forcing beneath
right entrance of upper jet streak. Clearing skies and the
arrival of low-pwat air mass should allow temps to fall into the
low 50s late tonight over the northwest mountains, along with
patchy valley fog. Elsewhere, lingering cloud cover associated
with stalling cold front will result in another very mild night
across the southeast counties.

&&

.SHORT TERM /THURSDAY THROUGH THURSDAY NIGHT/...
The combination of high pressure over New England and a
potential tropical depression east of the Carolinas will result
in a moist easterly flow off of the Atlantic Thursday and
Friday. Model soundings support a fair amount of stratus forming
at night east of the Allegheny Front, followed by gradual
brightening each day due to mixing of drier air aloft.
Scattered, diurnally-driven convection appears likely each day,
primarily over the southeast part of the forecast area. where
progged pwats are highest. Modest instability of 500-1000 J/kg
per latest ensemble plumes could support a few locally heavy
downpours Thursday afternoon across the Lower Susq Valley.
However, weak winds aloft indicate the severe threat will be low
from these pulse-type showers/tstorms.

Have undercut NBM high temps late this week due to its warm bias
in easterly flow scenarios. Expect max temperatures Thursday and
Friday in the mid to upper 70s. Low level moisture and overnight
stratus should result in a continuation of warm nights.

&&

.LONG TERM /FRIDAY THROUGH WEDNESDAY/...
Little change in guidance for the extended period, and stayed
close to NBM guidance for this weekend into early next week.
Rain chances will continue into the weekend as weak southern
stream cyclonic flow lingers west of ridging across the western
Atlantic. Kept afternoon POPs in the 20-30 percent range each
day due to the potential for diurnal convection. It will remain
unseasonably warm and humid with highs each day in the 70s to
lower 80s.

Ridging does look to build in at some point this weekend, but still
a tough call as to how quickly it will arrive. Sunday looks
like the better shot to be dry with with the ridge building in,
while Saturday could see some pop up convection in the afternoon
or early evening.

Early next week looks mainly dry and warm with the ridge
overhead and anomalously high heights.

&&

.AVIATION /16Z WEDNESDAY THROUGH SUNDAY/...
The cold front is slowly moving across the region. Showers in
the NW are dwindling, but expect thunderstorms to begin again by
the afternoon hours. Fog in the eastern and southeastern sights
this morning will quickly burn off by the mid morning hours.

Restrictions likely this afternoon and early evening accompanied
by thunderstorms and low cloud decks. Gusty winds possible this
afternoon with the storms. After storms diminish by the late
evening hours, skies will briefly clear up, but a return to fog
and MVFR/IFR for tonight is likely.

Outlook...

Thurs-Sun...Sct PM SHRA/TSRA. Localized restrictions possible.

&&

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

&&

SYNOPSIS...Steinbugl
NEAR TERM...Fitzgerald/Steinbugl
SHORT TERM...Fitzgerald/Steinbugl
LONG TERM...DeVoir/Travis
AVIATION...Gutierrez

Hazardous Weather Outlook
National Weather Service State College PA
1157 AM EDT Wed Sep 15 2021

PAZ012-017>019-024>028-033>037-041-042-045-046-049>053-056>059-
063>066-161600-
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-Lebanon-Cumberland-Adams-York-Lancaster-
1157 AM EDT Wed Sep 15 2021

...SEVERE THUNDERSTORM WATCH 501 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.

In addition to the potential for severe thunderstorms, locally heavy
rainfall may lead to isolated to scattered flooding issues.

.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.

PAZ004>006-010-011-161600-
Warren-McKean-Potter-Elk-Cameron-
1157 AM EDT Wed Sep 15 2021

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...This afternoon and tonight.

The probability for widespread hazardous weather is low.

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

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MRS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
205 PM EDT WED SEP 15 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0200 PM     TSTM WND DMG     1 WSW BELLEFONTE        40.91N 77.79W
09/15/2021                   CENTRE             PA   911 CALL CENTER

            TREES DOWN HILLARY RD. SPRING TWP.

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
206 PM EDT WED SEP 15 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0200 PM     TSTM WND DMG     1 SW BELLEFONTE         40.91N 77.78W
09/15/2021                   CENTRE             PA   911 CALL CENTER

            TREES AND WIRES DOWN.

&&

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