A deep upper low over southern Ontario and associated cold temperatures aloft contributed to isolated severe thunderstorms across Tioga County during the afternoon and evening.
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 deep upper low over southern Ontario and associated cold temperatures aloft contributed to isolated severe thunderstorms across Tioga County during the afternoon and evening.
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 25, 1:45 PM EST, 2 hours 3 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 245 PM EDT THU JUN 25 2009 .SYNOPSIS... A COLD FRONT WILL SLIDE SOUTHEAST ACROSS THE GREAT LAKES TODAY...THEN THROUGH PENNSYLVANIA TONIGHT AND EARLY FRIDAY. HIGH PRESSURE WILL BUILD IN FROM THE MIDWEST...LATE FRIDAY AND SATURDAY. HOWEVER...ANOTHER COLD FRONT WILL LIKELY PUSH THROUGH PENNSYLVANIA SUNDAY. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... MORNING UPDATE INCLUDES A DECREASE IN TEMPERS ACROSS THE NORTHWEST THIRD OF THE CWA AS CLOUDS ASSOCIATED WITH APPROACHING CONVECTION BEGIN TO LIMIT SUNSHINE. INCREASED THE COVERAGE OF THE ISOLATED AFTERNOON CONVECTION SLIGHTLY TO THE SOUTHEAST BASED ON CURRENT RADAR. EARLY AM WATER VAPOR LOOP SHOWING WEAK SHORTWAVE APPROACHING PA FROM THE GRT LKS. THIS FEATURE CURRENTLY PRODUCING ENOUGH FORCING TO KEEP SHRA/TSRA GOING OVR OHIO. HOWEVER...IT WILL BE MOVING INTO DRIER/MORE STABLE ATMOS ASSOCIATED WITH HI PRES RIDGE OVR PENNSYLVANIA...SO TDY SHOULD BE DRY FOR MOST OF CENTRAL PA. IR IMAGERY DOES SHOW SCT CIRRUS OVERSPREADING PA ATTM...WHICH WILL LIKELY BE ARND FOR MUCH OF THE DAY. A MORE IMPRESSIVE SHORTWAVE...CURRENTLY ENTERING WESTERN ONTARIO...WILL TRACK EASTWARD OVR THE NEXT 36HRS...PUSHING A COLD FRONT THRU THE STATE. ORGANIZED LINE OF LATE DAY/EVENING TSRA APPEAR LIKELY TO ROLE INTO THE NW MTNS...AS LARGE SCALE FORCING AND SIG DEEP LYR SHEAR ASSOCIATED WITH SHORTWAVE OVERSPREADS THE AREA. GEFS MEAN CAPES RISE TO ARND 2000J/KG IN PREFRONTAL AIRMASS OVR NORTHWEST PA LATE TDY AS HIGHER DWPTS ARE FED INTO THAT REGION BY LL JET. COMBINATION OF INSTABILITY AND SHEAR SUGGESTS LOCALLY SVR WX POSSIBLE OVR THE NW MTNS LATE TDY AND EVENING. UNDER MSUNNY SKIES...ENS MEAN 850 TEMPS NR 18C SHOULD SUPPORT HIGH TEMPS TDY FROM THE M80S OVR THE HIGH TERRAIN...TO L90S SUSQ VALLEY. THESE READINGS SHOULD BE THE WARMEST WE/VE SEEN SINCE THE THE RECORD MAXES OF LATE APRIL. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/... POTENT EVENING TSRA WILL LIKELY ACCOMPANY ARRIVAL OF COLD FRONT OVR THE NORTHWEST PART OF THE STATE. HOWEVER...WANING UPPER LVL FORCING AND STABILIZING BLYR SHOULD RESULT IN A DIMINISHING BAND OF SHRA/TSRA MOVING INTO CENTRAL/SOUTHERN PA LATE TONIGHT. LATEST SREF DATA INDICATES FRONT WILL TAKE UNTIL MID AFTN TO CLEAR LANCASTER COUNTY...SO WILL KEEP POPS GOING THRU THE FIRST HALF OF FRIDAY OVR THE SOUTHERN HALF OF THE STATE...AND THRU THE AFTN OVR THE EXTREME SOUTHEAST. COVERAGE WILL BE SCT AT BEST. HOWEVER...CAN/T RULE OUT ISOLATED SVR WX OVR THE LOWER SUSQ VALLEY...WHERE GEFS PLUME DATA INDICATE MEAN CAPES RECOVERING TO GREATER THAN 2000 J/KG BY AFTN. SOUNDING DATA SUGGESTS EARLY CLOUDS WILL GIVE WAY TO PTSUNNY SKIES AND TEMPS STILL A BIT ABOVE NORMALS FOR MOST LOCATIONS. && .LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/... 500MB TROUGH AXIS STEADILY SLIDES EAST SAT...WITH A SECONDARY LOBE OF VORTICITY PROGGED TO PIVOT ARND SW QUADRANT SAT AFTN. 850MB TEMPS STEADILY COOL BEHIND FRONT SAT...WITH MARGINAL INSTABILITY CAN/T RULE OUT ISO LOW TOPPED CONVECTION FROM A DIURNALLY DRIVEN ATMOS...FORCING WILL REMAIN VERY WEAK HOWEVER FROM SFC RIDGE OVERHEAD. ATTM HAVE LEFT DRY FORECAST IN PLACE. SFC TEMPS COULD STILL BE IN THE UPPER 70S/LOW 80S. FOCUS THEN TURNS TO APPROACH OF HIGH CONFIDENCE MID-LVL SHORTWAVE. SUN THRU WED. WEAK RIDGING SAT NGT WILL BE DEFLECTED EAST...AS FRONTAL BNDRY APPROACHES FROM WEST SUN. THETA-E RIDGE POKES EAST SUN AHEAD OF FRONTAL BNDRY...THUS HAVE MAINTAINED CHC SHRA/TSRA. RIDGE CENTERED OFF NEW ENGLAND COAST IS POISED TO SLOW EASTWARD PROGRESSION OF 500MB SHORTWAVE. THIS APPEARS TO BE GAINING CONFIDENCE...AND BRINGS A WEAK NW FLOW REGIME BACK INTO MID-ATLANTIC REGION EARLY NEXT WEEK. THIS SCENARIO SUGGESTS TEMPS WILL BE A BIT BLW NORMAL THRU THE PERIOD WITH A CHC OF DIURNAL CONVECTION...ESP OVR THE ELEVATED TERRAIN OF THE ALLEGHENIES. && .AVIATION /19Z THURSDAY THROUGH TUESDAY/... VFR XPCTD MOST OF THE FIRST 24 HRS. SCT SHRA/TSRA PSBL BEFORE 21Z AT KBFD...BUT MOST OTHER TERMINALS WILL STAY VFR WITH LIGHT W/NW WINDS THROUGH 03Z. SCT/NMRS HRA/TSRA WILL THEN REDEVELOP ACROSS THE LWR GR LAKES AND SHOULD MOVE INTO KBFD AROUND 23Z/00Z AND NEAR TO KUNV/KAOO/KIPT/KJST AROUND 03Z/04Z. THIS COULD BRING THESE LOCATIONS DOWN TO MVFR BUT IFR NOT LIKELY EXPECT FOR PERHAPS A VERY SHORT TIME. MOISTURE POOLING IS NOT GREAT...SFC WIND CONVERGENCE MINIMAL AND A LITTLE CAP IS PRESENT OVER THE SRN/SERN PART OF THE CWA. DYNAMICS BEST FOR STRONG STORMS VCTY KBFD AND TO THE N. SCT SHRA WILL LINGER ACRS SRN HALF OF THE AREA INTO FRI AM. BUT TS WILL BE ISOLD WITH LACK OF DAYTIME HEATING. OTHERWISE XPCT VFR FOR FRI AT MOST SITES. ONLY KMDT MIGHT HAVE CHC FOR SHRA/TS LINGER INTO THE AFTN. OUTLOOK... SAT...VFR. SUN...VFR...THEN MVFR IN NMRS SHRA/TS AFTN/EVE. MON/TUE...MAINLY VFR...MVFR PSBL IN SCT AFTN SHRA/TS. && .CTP WATCHES/WARNINGS/ADVISORIES... NONE. && SYNOPSIS...FITZGERALD NEAR TERM...FITZGERALD/TYBURSKI SHORT TERM...FITZGERALD LONG TERM...FITZGERALD/BEACHLER AVIATION...DANGELO
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 519 AM EDT THU JUN 25 2009 PAZ004>006-010>012-017>019-024>027-033-037-041-042-045-046-260930- WARREN-MCKEAN-POTTER-ELK-CAMERON-NORTHERN CLINTON-CLEARFIELD- NORTHERN CENTRE-SOUTHERN CENTRE-CAMBRIA-BLAIR-HUNTINGDON-MIFFLIN- SOMERSET-TIOGA-NORTHERN LYCOMING-SULLIVAN-SOUTHERN CLINTON- SOUTHERN LYCOMING- 519 AM EDT THU JUN 25 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. A COLD FRONT APPROACHING FROM GREAT LAKES WILL PRODUCE THUNDERSTORMS ACROSS MUCH OF THE AREA THIS EVENING. A FEW OF THESE STORMS COULD PRODUCE DAMAGING WIND GUSTS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. PAZ028-034>036-049>053-056>059-063>066-260930- JUNIATA-BEDFORD-FULTON-FRANKLIN-UNION-SNYDER-MONTOUR-NORTHUMBERLAND- COLUMBIA-PERRY-DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND-ADAMS-YORK- LANCASTER- 519 AM EDT THU JUN 25 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
408 PM EDT THU JUN 25 2009
PAZ004-252045-
WARREN PA-
408 PM EDT THU JUN 25 2009
...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN WARREN COUNTY...
AT 408 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 29 MILES WEST OF
WARREN...MOVING SOUTHEAST AT 15 MPH.
WIND GUSTS TO 50 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.
THIS STORM WILL BE NEAR COLUMBUS AROUND 430 PM.
LAT...LON 4191 7937 4174 7957 4179 7963 4199 7963
4200 7962 4200 7953
EXPERIMENTAL
FORECASTER: LA CORTEThe State College radar (KCCX), 117 km away, was scanning. The volume nearest the first event began at 20:49 UTC.
4 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds estimated near 60 mph knocked down trees and wires along Route 249.
Thunderstorm winds estimated near 60 mph knocked down a tree onto a house on 133 East Mains Street in Knoxville.
Thunderstorm winds estimated near 60 mph knocked down trees and wires near Wellsboro.
Thunderstorm winds estimated near 60 mph knocked down trees and wires along Route 660.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2009Every state in 2009This day in weather historyWarnings in Pennsylvania, June 2009
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: 168430, 168440, 168441, 168442.