A cold front triggered scattered thunderstorms during the late afternoon and early evening across western and central Pennsylvania. One storm produced isolated wind damage in Clearfield County.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS CTP wrote it up.
A cold front triggered scattered thunderstorms during the late afternoon and early evening across western and central Pennsylvania. One storm produced isolated wind damage in Clearfield County.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS State College, PA wrote its last area forecast discussion before the first event at Jun 12, 2:26 PM EST, 2 hours 25 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 326 PM EDT TUE JUN 12 2012 .SYNOPSIS... NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS ALONG AND JUST AHEAD OF A COLD FRONT WILL PUSH ACROSS THE REGION THIS EVENING AND EARLY TONIGHT. A WAVE OF LOW PRESSURE WILL DEVELOP ALONG THE FRONT OVER THE DELMARVA AND SLOWLY DRIFT ALONG THE MID-ATLANTIC COAST THROUGH MID-WEEK. THIS COULD PROVIDE CLOUDS OFF THE ATLANTIC OCEAN FOR THE END OF THE WEEK. HIGH PRESSURE WILL BUILD OVER THE NORTHEASTERN STATES THIS WEEKEND AND START A STRETCH OF GENERALLY FAIR WEATHER AND SEASONABLY WARM TEMPERATURES. && .NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/... AS THE SOUTHERLY FLOW CONTINUES TO MOVE EASTWARD IT WILL MOVE ANY LINGERING WIDESPREAD PRECIPITATION WITH IT. AMOUNTS OF A HALF INCH TO A LITTLE OVER AN INCH HAS FALLEN ACROSS THE LOWER SUSQ EARLY THIS AFTERNOON. BEHIND THIS EXITING SWATH OF PRECIPITATION...A PREFRONTAL LINE OF SHOWERS AND THUNDERSTORMS IS MAKING ITS WAY THROUGH CENTRAL PA THIS AFTERNOON. THE COLD FRONT EXTENDING ACROSS EASTERN LAKE ONTARIO EXTENDING SOUTHEASTERLY ACROSS OHIO WILL MAKE ITS WAY THROUGH PA LATE THIS AFTERNOON AND EVENING. ANOTHER STRONGER LINE OF SHOWERS AND THUNDERSTORMS WILL PROPAGATE ACROSS THE COMMONWEALTH AT...AND AHEAD OF THE FRONT. EXPECT LOCALLY HEAVY DOWNPOURS AND STRONG WINDS...GIVEN THE DEEP MOISTURE. CAPE IS AROUND 600 JOULES WITH THE STORMS CURRENTLY MOVING THROUGH AHEAD OF THE FRONT...WITH AROUND 1100-1400 JOULES ASSOCIATED WITH THE SHOWERS AND STORMS DIRECTLY AT AND SLIGHTLY AHEAD OF THE FRONT. DEWPOINTS ARE HIGH GIVEN THE SFC MOISTURE FROM THE SOUTHERLY FLOW. THE BIGGEST CONVECTIVE INHIBITOR IS THE MARGINAL INSTABILITY GIVEN THE CLOUD COVER AND LACK OF SFC HEATING. THIS IS WHY FROPA WILL BE SO IMPORTANT TO ANY CONVECTIVE DEVELOPMENT. EXPECT ANY STORMS TO BE MARGINAL...THOUGH ONE OR TWO STRONG STORMS COULD DEVELOP GIVEN DECENT SHEAR. THE 5 PCT CONVECTIVE WIND OUTLOOK JUST CLIPS MY WRN COUNTIES...BUT AGAIN FEEL THAT HIGHEST PROB OF SVR WOULD BE WEST OF THE MTNS IN PBZ CWA. THE COLD FRONT WILL MOVE THROUGH THE AREA TONIGHT....WITH STRONG DRY AIR ADVECTION BEHIND THE FRONT. EXPECT CLEARING SKIES AS THE EVENING CONTINUES...WITH NORTHERLY FLOW DOMINATING BY 06Z. MINS WILL BE RATHER CHILLY IN THE NW MTNS WITH READINGS IN THE MID- UPPER 40S AND IN THE MID 50S TO THE LOWER 60S DOWN TO THE SOUTHEAST. && .SHORT TERM /6 AM WEDNESDAY MORNING THROUGH 6 PM WEDNESDAY/... GIVEN THE DECENT PRECIPITATION AND THE STRONG SHIFT OF FLOW...ANY SFC DECOUPLING COULD ALLOW FOR PATCHY FOG AND LOW STRATOCU LATE TONIGHT...EARLY TOMORROW MORNING. BIGGEST AREAS OF CONCERN ARE ALONG THE NY PA BORDER AND THE LAUREL HIGHLANDS. ANY FOG/MIST SHOULD BE GONE BY 14Z. SKIES WILL CLEAR AS THE DAY CONTINUES TOMORROW...WITH GUSTY WINDS MIXING DOWN BY EARLY AFTERNOON. GUSTS SHOULD BE STRONGEST ALONG THE LOWER SUSQ...AS HIGH AS 20-25 MPH POSSIBLE. MAX TEMPS WILL BE MODERATED BY THE COOLER FLOW BEHIND THE FRONT...WITH HIGHS IN THE LOW 70S IN THE NW MTNS AND THE LAUREL HIGHLANDS...WITH MID TO UPPER 70S FROM CENTRAL PA DOWN TO THE LOWER SUSQ. && .LONG TERM /WEDNESDAY NIGHT THROUGH TUESDAY/... THE MAIN TROUBLES FOR THE LONG TERM PERIOD ARE 1- THE PRESENCE OF THE MINOR SFC LOW ALONG THE EAST COAST EARLY IN THE PERIOD...AND 2- THE PERSISTENT PATTERN IN THE GREATER PORTION OF THE PERIOD. THE LOW ALONG THE COAST IS NOW FORECAST TO DRIFT SOUTH A BIT BEFORE FILLING. HOWEVER...THE EASTERLY FLOW IS NOTORIOUS FOR BRINGING ATLANTIC MOISTURE IN AND CREATING CLOUDS AND EVEN DRIZZLE IN THE SE AND IN UPSLOPE AREAS IN THE CENTRAL MTS. THIS ON-SHORE FLOW PATTERN LOOKS TO BE A HIGH- LIKELIHOOD SCENARIO FOR LATE THURSDAY INTO FRIDAY AND PERHAPS FRIDAY NIGHT. BUT MID JUNE SUNSHINE IS AS STRONG AS WE CAN GET...AND DAYTIME MIXING CAN MIX THINGS UP PRETTY WELL. SO...WILL BUMP UP SKY COVER FOR THIS TIME FRAME...AND PUT IN THE UNMENTIONABLE 20 POPS FOR SOME DZ OR SCT SHRA IN THE S/E. WILL ALSO KEEP THE DIURNAL RANGES SMALLER IN THE SERN HALF OF THE AREA FOR THAT TIME FRAME. THE CLOUDS COULD STAY OR GO AWAY THEN RETURN THIS WEEKEND...BUT THAT IS A LOWER- PROBABILITY OUTCOME. PROBLEM NUMBER TWO FOLLOWS...WITH A LARGE SFC HIGH CENTERED OVER EASTERN CANADA AND THE NORTHEASTERN STATES SITTING OVERHEAD OR WITH THE AXIS STAYING JUST TO OUR WEST. THIS PATTERN WILL CREATE A STAGNANT SITUATION...BUT IT IS MOST-LIKELY THAT IT WILL RESULT IN FAIR WEATHER. TEMPS SHOULD NOT BE MUCH ABOVE OR BELOW NORMAL FOR THE REST OF THE EXTENDED PERIOD DUE TO THE LIGHT SE FLOW. AFTERNOON/POPCORN SHOWERS DO BECOME POSSIBLE AS TIME GOES ALONG. BUT...AS WITH THE POSSIBILITY OF DZ IN THE FIRST PART OF THE LONG TERM...THE PROB IS LOW ENOUGH TO KEEP POPS IN SLIGHT CHC RANGE. && .AVIATION /19Z TUESDAY THROUGH SUNDAY/... VERY MOIST FLOW CONTINUES TO MOVE EAST AS STEADY LIGHT TO MODERATE SHOWERS CONTINUE ACROSS THE EASTERN HALF OF PA. PREFRONTAL LINE OF SHOWERS AND THUNDERSTORMS IS CURRENTLY MAKING ITS WAY THROUGH THE ALLEGHENIES...WHICH SHOULD BRING MVFR TO IFR CIGS AND VSBYS TO BFD AND JST OVER THE NEXT HOUR. EXPECT AOO AND UNV TO BE AFFECTED AS THE AFTERNOON CONTINUES. A COLD FRONT APPROACHES LATE THIS AFTERNOON AND THROUGH THE EVENING. EXPECT ISOLATED TSRA AND SHRA ALONG AND AHEAD OF THIS FRONT. EXPECT LOW- END MVFR AND IFR CIGS TO PREVAIL WITH OCNL VIS REDUCTIONS AOB 2SM IN LCLY HVY RA. MVFR TO IFR CIGS WILL CONTINUE THROUGH MOST OF THE PERIOD UNTIL AFTER FRONTAL PASSAGE. EXPECT CIGS TO GO BACK DOWN BY 09Z GIVEN LOW LEVEL MOISTURE. AFTER 12Z WED SKIES SHOULD BEGIN TO CLEAR AS A MUCH DRIER NNWLY WIND BEHIND THE FROPA WILL BRING IMPROVING CONDS INTO EARLY WED. OUTLOOK... WED-FRI...MVFR CIGS POSSIBLE ESP CENTRAL/ERN SITES DUE TO EASTERLY MARITIME FLOW. SAT...VFR. NO SIG WX. && .CTP WATCHES/WARNINGS/ADVISORIES... NONE. && SYNOPSIS...STEINBUGL/DANGELO NEAR TERM...CERU/STEINBUGL SHORT TERM...CERU/STEINBUGL LONG TERM...DANGELO AVIATION...CERU/STEINBUGL
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 243 PM EDT TUE JUN 12 2012 PAZ004>006-010-011-017-024-033-131845- WARREN-MCKEAN-POTTER-ELK-CAMERON-CLEARFIELD-CAMBRIA-SOMERSET- 243 PM EDT TUE JUN 12 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. SHOWERS AND THUNDERSTORMS WILL MOVE THROUGH LATE THIS AFTERNOON AND EARLY THIS EVENING. ISOLATED STORMS COULD MAKE MARGINALLY SEVERE HAIL AND WIND GUSTS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. PAZ012-018-019-025>028-034>037-041-042-045-046-049>053-056>059- 063>066-131845- NORTHERN CLINTON-NORTHERN CENTRE-SOUTHERN CENTRE-BLAIR-HUNTINGDON- MIFFLIN-JUNIATA-BEDFORD-FULTON-FRANKLIN-TIOGA-NORTHERN LYCOMING- SULLIVAN-SOUTHERN CLINTON-SOUTHERN LYCOMING-UNION-SNYDER-MONTOUR- NORTHUMBERLAND-COLUMBIA-PERRY-DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND- ADAMS-YORK-LANCASTER- 243 PM EDT TUE JUN 12 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. A BRIEF BREAK AFTER THE MAIN AREA OF RAIN WILL BE FOLLOWED BY SHOWERS AND THUNDERSTORMS ALONG A COLD FRONT. LOCALLY HEAVY RAINFALL IS POSSIBLE THIS EVENING WHICH COULD LEAD TO AREAS OF MINOR FLOODING...AND GUSTY WINDS ARE ALSO POSSIBLE. BUT THE STORMS WILL BE WEAKENING AS THEY MOVE EASTWARD THIS EVENING. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. DANGELO
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
244 PM EDT TUE JUN 12 2012
PAZ004-005-121945-
MCKEAN PA-WARREN PA-
244 PM EDT TUE JUN 12 2012
...A STRONG THUNDERSTORM WILL AFFECT WARREN AND WESTERN MCKEAN
COUNTIES...
AT 242 PM EDT...AN AREA OF STRONG THUNDERSTORMS WAS NEAR
YOUNGSVILLE...MOVING EAST AT 15 MPH.
WIND GUSTS TO 40 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.
VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO
POND ON ROADS AND FILL POOR DRAINAGE AREAS. THE RAIN WILL CAUSE RAPID
RISES ON SMALL STREAMS AND CREEKS. THIS STORM WILL AFFECT
YOUNGSVILLE...WARREN...CLARENDON...SCANDIA AND KINZUA DAM.
THIS WILL IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 6...ROUTE 62...
STATE ROAD 59...STATE ROAD 66.
LAT...LON 4199 7885 4163 7880 4162 7952 4163 7962
4171 7962 4200 7947
FORECASTER: CRSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
323 PM EDT TUE JUN 12 2012
PAZ005-006-122000-
MCKEAN PA-POTTER PA-
323 PM EDT TUE JUN 12 2012
...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN MCKEAN AND WEST
CENTRAL POTTER COUNTIES THROUGH 4 PM EDT ...
AT 321 PM EDT...A STRONG THUNDERSTORM WAS NEAR KINZUA BRIDGE STATE
PARK...MOVING EAST AT 20 MPH.
WIND GUSTS TO 40 MPH AND PEA TO MARBLE SIZE HAIL ARE POSSIBLE WITH
THIS THUNDERSTORM. EXPECT FREQUENT...DANGEROUS CLOUD TO GROUND
LIGHTNING FROM THIS STORM. DO NOT STAY IN THE OPEN NOR SEEK SHELTER
UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A
THUNDERSTORM APPROACHES. THIS STORM WILL AFFECT
SMETHPORT...NORWICH...PORT ALLEGANY AND KEATING SUMMIT.
THIS STORM WILL ALSO IMPACT ROUTE 6.
LAT...LON 4159 7806 4159 7817 4162 7820 4162 7842
4160 7842 4160 7848 4163 7849 4163 7861
4169 7863 4179 7862 4185 7806
FORECASTER: LAMBERTSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
432 PM EDT TUE JUN 12 2012
PAZ005-006-010-011-122130-
CAMERON PA-ELK PA-MCKEAN PA-POTTER PA-
432 PM EDT TUE JUN 12 2012
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CAMERON...ELK...
SOUTHERN MCKEAN AND SOUTHWESTERN POTTER COUNTIES THROUGH 530 PM
EDT...
AT 429 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
WILCOX TO RIDGWAY TO BROCKWAY...MOVING EAST AT 30 MPH.
WIND GUSTS UP TO 40 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THESE
STORMS. THESE STORMS WILL AFFECT MOUNT JEWETT...ST.
MARYS...NORWICH...MEDIX RUN AND HICKS RUN.
THIS WILL IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 6...ROUTE 219...
STATE ROAD 66...STATE ROAD 120...STATE ROAD 255.
LAT...LON 4173 7795 4145 7798 4123 7817 4125 7864
4123 7865 4123 7874 4126 7874 4134 7892
4146 7884 4172 7881
FORECASTER: LAMBERTSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
446 PM EDT TUE JUN 12 2012
PAZ010-017-122145-
CLEARFIELD PA-ELK PA-
446 PM EDT TUE JUN 12 2012
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CLEARFIELD AND
SOUTHEASTERN ELK COUNTIES THROUGH 545 PM EDT...
AT 442 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
BROCKWAY TO DUBOIS TO BIG RUN...MOVING EAST AT 25 MPH.
WIND GUSTS UP TO 40 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THESE
STORMS. THESE STORMS WILL AFFECT TROUTVILLE...ROCKTON...S.B. ELLIOT
STATE PARK...WOODLAND AND LECONTES MILLS.
THIS WILL IMPACT I-80 BETWEEN MILE MARKERS 97 AND 131.
LAT...LON 4113 7881 4120 7878 4121 7876 4121 7872
4122 7872 4123 7874 4126 7873 4125 7824
4123 7823 4122 7812 4107 7811 4088 7831
4090 7881
FORECASTER: LAMBERTSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
542 PM EDT TUE JUN 12 2012
PAZ011-012-017>019-024>026-041-045-122245-
BLAIR PA-CAMBRIA PA-CAMERON PA-CLEARFIELD PA-HUNTINGDON PA-
NORTHERN CENTRE PA-NORTHERN CLINTON PA-NORTHERN LYCOMING PA-
SOUTHERN CENTRE PA-SOUTHERN CLINTON PA-
542 PM EDT TUE JUN 12 2012
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT THE FOLLOWING COUNTIES
THROUGH 645 PM...BLAIR...CAMBRIA...CENTRE...CLEARFIELD...
NORTHWESTERN HUNTINGDON...SOUTHEASTERN CAMERON...WEST CENTRAL
LYCOMING AND WESTERN CLINTON...
AT 538 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
STEVENSON DAM TO 6 MILES NORTH OF KARTHAUS TO WALLACETON TO WESTOVER
TO BRUSH VALLEY...MOVING TO THE EAST SOUTHEAST AT 35 MPH.
WIND GUSTS TO 40 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THESE
STORMS. THESE STORMS WILL AFFECT PINE GLEN...SNOW SHOE...SANDY
RIDGE...UNIONVILLE...PARK FOREST AND ZION OVER THE NEXT HOUR.
THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...
I-80 BETWEEN MILE MARKERS 116 AND 171...I-99 BETWEEN MILE MARKERS 22
AND 85.
LAT...LON 4088 7872 4105 7849 4124 7830 4123 7824
4132 7825 4148 7818 4142 7746 4101 7756
4082 7776 4034 7840 4038 7899
FORECASTER: LAMBERTThe State College radar (KCCX), 23 km away, was scanning. The volume nearest the first event began at 21:51 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds estimated near 60 mph knocked down trees in West Decatur Township.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2012Every state in 2012This day in weather historyWarnings in Pennsylvania, June 2012
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 376085.