Special Weather Statement, NWS State College, PA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1241 AM EDT FRI JUN 29 2012

.SYNOPSIS...
A WEAK COLD FRONT IS EXPECTED TO PASS THROUGH CENTRAL PA ON FRIDAY.
HOT AND MUGGY CONDITIONS WILL PREVAIL OVER THE UPCOMING WEEKEND
AND INTO NEXT WEEK...AS THE COLD FRONT STALLS NEAR
PENNSYLVANIA...MARYLAND BORDER. THERE WILL BE A CHANCE OF SHOWERS
AND THUNDERSTORMS INTO MONDAY...ESPECIALLY ON FRIDAY AND SATURDAY.

&&

.NEAR TERM /UNTIL 6 AM THIS MORNING/...
RAPID RELEASE OF ML CAPES IN EXCESS OF 1500 J/KG OVER NORTHEAST OH
AND EXTREME NORTHWEST PA HAS YIELDED HAIL PRODUCERS WITH STORM
TOPS IN EXCESS OF 55K FEET EARLY THIS MORNING. ANTICIPATE MAINLY A
LCL HAIL THREAT INITIALLY...TRENDING TOWARDS SQUALL LINE EVOLUTION
THAT MAKES A RIGHT TURNS ACROSS THE LAUREL HIGHLANDS AND SOUTH
CENTRAL MOUNTAINS. COSPA/HRRR OUTPUT SIMULATES ADDITIONAL
DEVELOPMENT ACROSS N CENTRAL PA OVERNIGHT AS WELL...BUT THINK THE
REAL ACTION WILL BE ADJACENT TO THE 40+ KT LLJ OVER THE W CENTRAL
MOUNTAINS AND LAURELS.

OVERALL...IT WILL A WARM AND INCREASINGLY MUGGY NIGHT AS SW FLOW
ADVECTS HIGHER DEWPOINTS...CURRENTLY OVR OHIO...INTO OUR REGION.
THE INCREASED LL MOISTURE...COMBINED WITH A SW BREEZE...WILL LIMIT
COOLING AND RESULT IN OVERNIGHT LOWS FROM TH 60S TO LOWER 70S.

TSRA THAT MAY AFFECT THE AREA OVERNIGHT SHOULD BE FAIRLY FAST-
MOVING...RESULTING IN RAINFALL OF JUST A QUARTER TO HALF INCH IN
MOST LOCATIONS.

&&

.SHORT TERM /6 AM THIS MORNING THROUGH 6 PM SATURDAY/...
ANY CONVECTION EARLY FRIDAY WILL EXIT QUICKLY TO THE SOUTHEAST OF
THE FCST AREA AS A BRIEF SURGE OF DRIER AIR MOVES ACROSS CENTRAL
AND NORTHERN PA FROM LATE FRIDAY MORNING THROUGH THE REST OF THE
DAY. FAIRLY STRONG DEEP LAYER SUBSIDENCE AND A GUSTY NWRLY LL FLOW
WILL DEVELOP IN THE WAKE OF THE DEPARTING COLD FRONT SUPPLYING
ABUNDANT SUNSHINE...AND RATHER HOT/DRY WEATHER.

850 MB TEMPS NEAR 20C ACROSS THE NORTH...AND NEAR 24C ACROSS THE
SOUTH ON FRIDAY WILL LEAD MAX TEMPS NEARLY 10F ABOVE NORMAL...OR IN
THE MID 80S NORTH...AND MID 90S ACROSS THE LOWER SUSQ VALLEY.
ALTHOUGH DRIER AIR WILL ARRIVE OVR CENTRAL AND NORTHERN PA ON
FRIDAY...HUMID AIR LINGERING ACROSS THE LOWER SUSQ VALLEY SHOULD
RESULT IN HEAT INDICES VERY NEAR 100F DURING THE AFTN.

&&

.LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/...
NOT A LOT OF CHANGE FROM RECENT DAYS. MAIN THING WAS TO UP
DEWPOINTS ON SAT AFT. WHILE THE AIRMASS DRIES OUT SOME FRIDAY
AFT...DEWPOINTS FCST TO COME UP AGAIN BY SAT AFT...AS ONE IS
NEAR OUR JUST NORTH OF THE FRONT. THIS HAS OCCURRED TODAY ACROSS
SOUTHERN IOWA...WHERE DEWPOINTS POOLING INTO THE MID TO UPPER 70S.
THIS RESULTS IN HAVING HEAT INDICES NEAR 100 ON SAT...THUS THE
ADVISORY RUNS FROM FRIDAY INTO SAT. OTHERWISE...DEWPOINTS HAVE
NOT BEEN THAT HIGH WITH THIS AIRMASS.

THE OTHER CONCERN IS CONVECTION. THE INTENSE SLAB OF VERY WARM
AIR ALOFT WILL TEND TO CAP THINGS OFF...AND WHILE THE MOST
UNSTABLE AIRMASS WILL LIKELY BE TO THE SOUTH AND WEST OF CENTRAL
PA FOR MUCH OF THE PERIOD...THERE MAY BE TIMES LIKE LATE SATURDAY
WHERE A FEW SHOWERS AND STORMS COULD FORM.

THE LEAST LIKELY TIME FOR ACTIVITY IS AFTER SUNDAY...AS THE FLOW
BECOMES MORE NW...AND SLIGHTLY COOLER AIR IS WORKS INTO THE AREA.
HOWEVER A LOT OF SPREAD IN SOLUTIONS FROM DAY TO DAY. WENT WITH
A DRY FORECAST FOR MUCH OF THE PERIOD AFTER MONDAY.

&&

.AVIATION /06Z FRIDAY THROUGH TUESDAY/...
EXPECT A CONTINUATION OF MAINLY VFR CONDITIONS OVERNIGHT INTO
FRIDAY AS WARM AND DRY AIR REMAINS OVER THE FCST AREA.

LATER THIS EVENING AND OVERNIGHT THERE WILL BE AN INCREASED CHANCE
OF CONDITIONS DETERIORATING AS THUNDERSTORMS THAT ARE EXPECTED TO
FORM OVER THE LOWER GREAT LAKES/OHIO VALLEY SWEEP ACROSS THE STATE
FROM WEST TO EAST. THIS WILL LIKELY BRING A PERIOD OF MVFR/IFR LATER
AFTER ABOUT 03Z IN THE NW THRU THE PRE DAWN HOURS. THERE COULD
EVEN BE SOME LATE NIGHT HAIL AND GUSTY WINDS...UNUSUAL FOR THAT
TIME OF DAY...GIVEN THE HIGH CAPE AIRMASS UPSTREAM.

LLWS FROM 04-06Z IS POSSIBLE DUE TO THE PASSING SYSTEM...
ESPECIALLY AT AOO AND JST FROM THE NORTHWEST AT 40KTS.

AFTER ANY REMNANTS OF THE OVERNIGHT CONVECTION MOVE OUT AND PATCHY
FOG AND HAZE DISSIPATE...MAINLY VFR CONDS SHOULD RETURN FOR THE
BULK OF THE DAY TOMORROW.

OUTLOOK...
FRI NIGHT...MAINLY VFR. ISOLD SHOWERS/TSTMS WITH LOCAL RESTRICTIONS.

SAT-MON...MAINLY VFR. SLIGHT CHC OF A SHOWER/TSTM. FOG AND HZ
EARLY.

TUES...VFR.

&&

.CTP WATCHES/WARNINGS/ADVISORIES...
HEAT ADVISORY FROM 3 PM THIS AFTERNOON TO 8 PM EDT SATURDAY
FOR PAZ028-035-036-056-057-059-063>066.

&&

SYNOPSIS...FITZGERALD/LA CORTE
NEAR TERM...DEVOIR/FITZGERALD
SHORT TERM...FITZGERALD/LA CORTE
LONG TERM...MARTIN
AVIATION...LA CORTE/GARTNER

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1234 AM EDT FRI JUN 29 2012

PAZ006-012-018-019-024>027-033-034-037-041-042-045-046-049>053-058-
300445-
POTTER-NORTHERN CLINTON-NORTHERN CENTRE-SOUTHERN CENTRE-CAMBRIA-
BLAIR-HUNTINGDON-MIFFLIN-SOMERSET-BEDFORD-TIOGA-NORTHERN LYCOMING-
SULLIVAN-SOUTHERN CLINTON-SOUTHERN LYCOMING-UNION-SNYDER-MONTOUR-
NORTHUMBERLAND-COLUMBIA-SCHUYLKILL-
1234 AM EDT FRI JUN 29 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...TONIGHT.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

THE PROBABILITY OF WIDESPREAD SEVERE WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

PAZ028-035-036-056-057-059-063>066-300445-
JUNIATA-FULTON-FRANKLIN-PERRY-DAUPHIN-LEBANON-CUMBERLAND-ADAMS-YORK-
LANCASTER-
1234 AM EDT FRI JUN 29 2012

...HEAT ADVISORY IN EFFECT FROM 3 PM THIS AFTERNOON TO 8 PM EDT
SATURDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO
WEATHER.GOV/STATECOLLEGE ON THE INTERNET FOR MORE
INFORMATION ABOUT THE FOLLOWING HAZARDS.

   HEAT ADVISORY.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO
WEATHER.GOV/STATECOLLEGE ON THE INTERNET FOR MORE
INFORMATION ABOUT THE FOLLOWING HAZARDS.

   HEAT ADVISORY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

PAZ004-005-010-011-017-300445-
WARREN-MCKEAN-ELK-CAMERON-CLEARFIELD-
1234 AM EDT FRI JUN 29 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...TONIGHT.

A COLD FRONT PRESSING SOUTHEAST FROM THE GREAT LAKES COULD PRODUCE
SCATTERED STRONG THUNDERSTORMS ACROSS THE AREA AROUND MIDNIGHT.
THERE IS A SLIGHT CHANCE THAT SOME OF THESE STORMS COULD PRODUCE
DAMAGING WIND GUSTS OR LARGE HAIL.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

THE PROBABILITY OF WIDESPREAD SEVERE WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

DEVOIR

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