Special Weather Statement, NWS State College, PA

Area Forecast Discussion
National Weather Service State College PA
1048 PM EDT Tue Aug 10 2021

.SYNOPSIS...
Very warm to hot conditions will last through the end of this
week. The heat will peak Wednesday and Thursday afternoons
across central and southeastern parts of the area with
widespread highs in the low to mid 90s and heat indices
exceeding 100 degrees in spots both afternoons. The hot and
humid conditions will also fuel daily rounds of scattered
showers and thunderstorms. Expect relief from the heat to
arrive by the weekend.

&&

.NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/...
H5 shortwave tracking through southeast Ontario late this
evening with a flat trough axis swinging through north central
PA. Still some isold shra/tsra roaming areas along and north of
I-80 and this will be the case until a few hours past midnight.

Elsewhere, gradual decrease in clouds taking place with areas
of fog expected in areas that rained. It will remain very muggy
thru the night with only isold/sct SHRA in the north for the
second half of the area.

&&

.SHORT TERM /6 AM WEDNESDAY MORNING THROUGH 6 PM WEDNESDAY/...
Wednesday is looking like a repeat of Tuesday for temps. With 5h
heights rather high (590+ dm) a very weak short wave slides
overhead during the afternoon and evening. PWs pool over 2
inches over our southeast, but it appears to be so warm that
convection may be limited to scattered coverage. Am concerned
that any convection that does develop would produce heavy
downpours over my southeast given the tropical PWs arriving, but
we'll deal with that tomorrow.

Heat Advy remains in effect for roughly the southern half of
the area heat indices reach as high as 101F.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH TUESDAY/...
Hottest day on tap Thursday with heat indices as high as ~105F
over parts of the Lower Susq River Valley. A long- wave trough
finally breaks down the ridge late in the week with Friday
perhaps turning out a couple of degs cooler, but still above 90
for most places south of I-80 and east of I-99. Models differ
with the timing of the sfc cold fropa in the Fri- Sat time
frame. The ECMWF deterministic run pushes it through with
numerous showers and tstms late in the day / early evening Fri,
while the slower GFS holds the cold fropa until the more stable
Fri overnight hours, with less convection.

Showers may linger across the south Saturday as the cold front
slows down through Maryland and Virginia. Otherwise, the weekend
looks pleasant - cooler and much less humid as high pressure
builds in from the north and west.

&&

.AVIATION /03Z WEDNESDAY THROUGH SUNDAY/...
Several areas of convection across PA early this evening, mostly
over the southern half of central PA. Elsewhere, VFR is
predominant with hazy skies across the region. Convection will
wind down after sunset with VFR, but hazy conditions overnight
and first half of tomorrow. More afternoon convection possible
next few days as region in the middle of a very warm and humid
weather pattern.

Outlook...

Wed...AM low cigs possible NW Mtns. Scattered PM tsra impacts
possible.

Thu-Sat...Scattered PM tsra impacts possible.

&&

.CTP WATCHES/WARNINGS/ADVISORIES...
Heat Advisory from noon to 7 PM EDT Wednesday for PAZ028-036-
046-049>053-056>059-063>066.
Heat Advisory from noon to 7 PM EDT Thursday for PAZ019-
025>028-036-045-046-049>053-056>059-063>066.

&&

SYNOPSIS...DeVoir
NEAR TERM...DeVoir
SHORT TERM...DeVoir/Dangelo
LONG TERM...DeVoir/Gartner
AVIATION...Ross/DeVoir

Hazardous Weather Outlook
National Weather Service State College PA
1258 PM EDT Tue Aug 10 2021

PAZ004>006-010>012-017-018-024-033>035-037-041-042-111700-
Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Clearfield-
Northern Centre-Cambria-Somerset-Bedford-Fulton-Tioga-
Northern Lycoming-Sullivan-
1258 PM EDT Tue Aug 10 2021

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...This afternoon and tonight.

Strong to severe thunderstorms with gusty winds are possible this
afternoon and early evening.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Strong to severe thunderstorms with gusty winds are possible both
Wednesday and Thursday afternoon and evening.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report significant hazardous weather.

PAZ028-036-046-049>053-056>059-063>066-111700-
Juniata-Franklin-Southern Lycoming-Union-Snyder-Montour-
Northumberland-Columbia-Perry-Dauphin-Schuylkill-Lebanon-Cumberland-
Adams-York-Lancaster-
1258 PM EDT Tue Aug 10 2021

...HEAT ADVISORY IN EFFECT FROM NOON TO 7 PM EDT WEDNESDAY...
...HEAT ADVISORY IN EFFECT FROM NOON TO 7 PM EDT THURSDAY...

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...This afternoon and tonight.

Strong to severe thunderstorms with gusty winds are possible this
afternoon and evening.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

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

   Heat Advisory.

Strong to severe thunderstorms with gusty winds are possible both
Wednesday and Thursday afternoon and evening.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report significant hazardous weather.

PAZ019-025>027-045-111700-
Southern Centre-Blair-Huntingdon-Mifflin-Southern Clinton-
1258 PM EDT Tue Aug 10 2021

...HEAT ADVISORY IN EFFECT FROM NOON TO 7 PM EDT THURSDAY...

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...This afternoon and tonight.

Strong to severe thunderstorms with gusty winds are possible this
afternoon and evening.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

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

   Heat Advisory.

Strong to severe thunderstorms with gusty winds are possible both
Wednesday and Thursday afternoon and evening.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report significant hazardous weather.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
754 PM EDT TUE AUG 10 2021

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

0650 PM     TSTM WND DMG     SPRING GROVE            39.88N 76.86W
08/10/2021                   YORK               PA   TRAINED SPOTTER

            LARGE TREES DOWN.

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
802 PM EDT TUE AUG 10 2021

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

0646 PM     TSTM WND DMG     1 SE LITITZ             40.14N 76.29W
08/10/2021                   LANCASTER          PA   911 CALL CENTER

            WIRES DOWN.

&&

AW

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
847 PM EDT TUE AUG 10 2021

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

0739 PM     TSTM WND DMG     5 E QUARRYVILLE         39.89N 76.07W
08/10/2021                   LANCASTER          PA   911 CALL CENTER

            WIDESPREAD DOWNED POWERLINES AND WIRES.

&&

AW

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
848 PM EDT TUE AUG 10 2021

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

0650 PM     TSTM WND GST     2 S LITITZ              40.12N 76.30W
08/10/2021  M59 MPH          LANCASTER          PA   ASOS

            NUMEROUS POWER OUTAGES IN THE AREA.

&&

MRC

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE STATE COLLEGE PA
906 PM EDT TUE AUG 10 2021

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

0230 PM     TSTM WND DMG     2 N DAUPHIN             40.40N 76.93W
08/10/2021                   DAUPHIN            PA   PUBLIC

            MULTIPLE TREES SNAPPED AND UPROOTED.

0234 PM     TSTM WND DMG     2 NNW DAUPHIN           40.40N 76.95W
08/10/2021                   DAUPHIN            PA   911 CALL CENTER

            TREES ON ROAD.

0235 PM     TSTM WND DMG     2 WNW ELLENDALE FORGE   40.41N 76.89W
08/10/2021                   DAUPHIN            PA   911 CALL CENTER

            TREES DOWN ON CLARKS VALLEY RD.

0625 PM     TSTM WND DMG     HANOVER                 39.81N 76.98W
08/10/2021                   YORK               PA   TRAINED SPOTTER

            TREES DOWN ON STOCK ST AND MCCOSH ST.

0635 PM     TSTM WND DMG     3 WSW YORK              39.95N 76.78W
08/10/2021                   YORK               PA   911 CALL CENTER

            WIRES DOWN.

0636 PM     TSTM WND DMG     1 SE YORK               39.96N 76.72W
08/10/2021                   YORK               PA   911 CALL CENTER

            WIRES DOWN.

0646 PM     TSTM WND DMG     1 SE LITITZ             40.14N 76.29W
08/10/2021                   LANCASTER          PA   911 CALL CENTER

            WIRES DOWN.

0650 PM     TSTM WND DMG     SPRING GROVE            39.88N 76.86W
08/10/2021                   YORK               PA   TRAINED SPOTTER

            LARGE TREES DOWN.

0650 PM     TSTM WND GST     2 S LITITZ              40.12N 76.30W
08/10/2021  M59 MPH          LANCASTER          PA   ASOS

            NUMEROUS POWER OUTAGES IN THE AREA.

0739 PM     TSTM WND DMG     5 E QUARRYVILLE         39.89N 76.07W
08/10/2021                   LANCASTER          PA   911 CALL CENTER

            WIDESPREAD DOWNED POWERLINES AND WIRES.

&&

Special Weather Statement
National Weather Service State College PA
1218 AM EDT Wed Aug 11 2021

PAZ019-045-049-110445-
Southern Clinton PA-Union PA-Southern Centre PA-
1218 AM EDT Wed Aug 11 2021

...A strong thunderstorm will impact portions of east central Centre,
central Union and southeastern Clinton Counties through 1245 AM
EDT...

At 1217 AM EDT, Doppler radar was tracking a strong thunderstorm over
Blanchard, moving east at 45 mph.

HAZARD...Wind gusts up to 50 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Mifflinburg, Carroll, Lamar, Blanchard, Bald Eagle State Park, R.B.
Winter State Park, Mackeyville, Forest Hill, Sand Bridge State Park,
Howard, Beech Creek, Loganton and McCall Dam State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4104 7702 4089 7705 4102 7773 4104 7772
      4109 7763
TIME...MOT...LOC 0417Z 281DEG 39KT 4103 7758

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

Martin