Scattered thunderstorms developed along a stalled boundary across western Pennsylvania with an isolated severe thunderstorm over Westmoreland 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 PBZ wrote it up.
Scattered thunderstorms developed along a stalled boundary across western Pennsylvania with an isolated severe thunderstorm over Westmoreland 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 Pittsburgh, PA wrote its last area forecast discussion before the first event at Jun 16, 12:30 PM EST, 6 hours 50 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 130 PM EDT TUE JUN 16 2009 .SYNOPSIS... A SERIES OF LOW PRESSURE SYSTEMS WILL BRING PERIODS OF SHOWERS AND THUNDERSTORMS TO THE REGION FOR THE REMAINDER OF THE WEEK. && .NEAR TERM /THROUGH WEDNESDAY/... ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ARE BEGINNING TO DEVELOP AHEAD OF A WARM FRONTAL BOUNDARY STRETCHING ACROSS THE CENTRAL/SOUTHERN OHIO VALLEY. PRECIP WILL GRADUALLY MOVE TO THE NORTHEAST ACROSS THE UPPER OHIO VALLEY TONIGHT AS LOW PRESSURE APPROACHES FROM THE WEST. BY TOMORROW...UPPER LEVEL LOW PRESSURE WILL ENTER THE UPPER GREAT LAKES WITH A TROUGH EXTENDING ACROSS THE UPPER OHIO VALLEY. WITH DEEP LAYER MOISTURE IN PLACE...HAVE INCREASED POPS TO CATEGORICAL FOR ALL AREAS WEDNESDAY. WITH ENERGY CLOSE TO THE UPPER LOW WELL TO THE NORTHWEST...AND NEAR A SHORTWAVE ROTATING ACROSS THE CENTRAL/SOUTHERN OHIO VALLEY THINK TSTM COVERAGE WILL BE LIMITED IN COVERAGE...AND RESTRICTED TO THE AFTN/EVE HOURS. STRONG TSTMS ARE NOT EXPECTED FOR SOUTHWEST PA AND POINTS EAST...WITH A MINOR POTENTIAL FOR A STRONG STORM OR TWO FURTHER WEST IN A LITTLE BETTER INSTABILITY AND SOME DEEP LAYER SHEAR. WILL KEEP SPECIFIC THREAT WORDING OUT OF THE FCST FOR NOW. RAINFALL AMOUNTS FROM LATE TNGT THROUGH WEDNESDAY WILL GENERALLY BE IN THE ONE INCH RANGE...BUT WITH RAINFALL RATES REMAINING RATHER LOW...DO NOT EXPECT ANY FLOODING CONCERNS. WITH THICK OVERCAST AND PRECIP...HIGH TEMPERATURES WEDNESDAY WILL STAY 10-15 DEGREES BELOW NORMAL EAST OF PIT...AND ABOUT 5 DEGREES BELOW NORMAL ACROSS EASTERN OHIO WITH PERHAPS A LESSENING OF PRECIP AND A FEW CLOUD BREAKS IN THE AFTN. && .SHORT TERM /WEDNESDAY NIGHT THROUGH FRIDAY/... PRECIP WILL GRADUALLY DIMINISH WEDNESDAY NIGHT AS LOW PRESSURE EXITS TO THE EAST. AFTER A BRIEF BREAK FROM PRECIP LATE WEDNESDAY NIGHT INTO THURSDAY...THE NEXT AREA OF LOW PRESSURE IS PROGGED TO ENTER THE REGION FOR THURSDAY NIGHT/FRIDAY. STILL DIFFERENCES IN MODEL SOLUTIONS...AND WITH NOT VERY GOOD RUN TO RUN CONTINUITY...WILL KEEP GENERAL CHANCE POPS. NEAR NORMAL TEMPERATURES WILL PREVAIL. && .LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/... MODEL PROJECTIONS FOR THE WEEKEND AND EARLY NEXT WEEK HAVE BEEN PERSISTENT IN FORECASTS OF A TRANSITION TO ANOTHER EASTERN CANADA/CONUS MID/UPPER TROUGH. HOWEVER, QUESTIONS ON AMPLITUDE AND AXIS PLACEMENT REMAIN. FOR THIS ISSUANCE, FORECAST WILL BE OF A HIGHER AMPLITUDE TROUGH AND WESTWARD PLACEMENT OF THE TROUGH AXIS TO...A DRIER AND COOLER SCENARIO FOR THE UPPER OHIO REGION FOLLOWING PASSAGE OF THE SATURDAY COLD FRONT AND SUNDAY MID LEVEL TROUGH. FORECAST WAS BASED ON HPC POSITIONING OF PRESSURE CENTERS/FRONTS, BUT WITH SUB-GUIDANCE, AND THUS SUB-NORMAL TEMPERATURES. THE MORE EASTWARD SCENARIO COULD VERY WELL RESULT IN WARMER/SEASONAL TEMPERATURES FOR THE FIRST HALF OF THE WEEK, BUT WITH SHORTWAVES MOVING ACROSS THE UPPER OHIO VALLEY IN NORTHWEST FLOW, SPARKING THUNDERSTORMS IN A HIGH SHEAR ENVIRONMENT ALONG BAROCLINIC ZONE. WILL INTRODUCE SOME THUNDERSTORM CHANCE LATE ON DAY 7 FOR THIS TYPE OF SITUATION AS PER EXPECTED EASTWARD PROGRESS OF THE MID/UPPER TROUGH. && .AVIATION /17Z TUESDAY THROUGH SATURDAY/... TODAY...GENERALLY VFR CONDITIONS WITH WIND VEERING TO THE SOUTHEAST ARE EXPECTED AS LOW PRESSURE BEGINS A MOVE TOWARD THE GREAT LAKES. FOR TONIGHT, PUDDLE OF ATLANTIC MOISTURE LYING EAST OF THE RIDGES WILL BE TAPPED AND INITIAL FORECAST WILL BE OF CEILING DETERIORATION TO MVFR, AND EVENTUAL IFR AT DUJ AND ZZV AFTER DARK, AND TOWARD MORNING ELSEWHERE AS WARM FRONT IS PULLED NORTHWARD WITH THE ADVANCING LOW. FOR LBE AND MGW, WILL GUESS THAT STRENGTHENING DOWNSLOPE WILL ERODE POTENTIAL FOR LOW CEILINGS UNTIL RAIN ARRIVES AND THERE IS FURTHER VEERING OF THE WIND TO THE SOUTH. THEREAFTER...PERIODIC REDUCTIONS IN FLIGHT CONDITIONS MAY BE EXPECTED FOR THE REMAINDER OF THE WEEK, FIRST AS THE AFORE-MENTIONED LOW CONTINUES ACROSS THE GREAT LAKES, THEREAFTER, AS DISTURBANCES IN THE FLOW WILL SPAWN MORE PRECIPITATION ALONG FRONT PROGGED TO MEANDER OVER THE UPPER OHIO RIVER VALLEY. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 430 AM EDT TUE JUN 16 2009 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029>032-WVZ001>004-012-021>023-041-170830- GARRETT-TUSCARAWAS-CARROLL-COLUMBIANA-COSHOCTON-HARRISON- JEFFERSON OH-MUSKINGUM-GUERNSEY-BELMONT-NOBLE-MONROE-MERCER-VENANGO- FOREST-LAWRENCE-BUTLER-CLARION-JEFFERSON PA-BEAVER-ALLEGHENY- ARMSTRONG-INDIANA-WASHINGTON-WESTMORELAND-GREENE-FAYETTE-HANCOCK- BROOKE-OHIO-MARSHALL-WETZEL-MARION-MONONGALIA-PRESTON-TUCKER- 430 AM EDT TUE JUN 16 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MARYLAND...EAST CENTRAL OHIO...NORTHWEST PENNSYLVANIA...SOUTHWEST PENNSYLVANIA...WEST CENTRAL PENNSYLVANIA...NORTHERN WEST VIRGINIA AND NORTHERN PANHANDLE OF WEST VIRGINIA. .DAY ONE...TODAY AND TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 626 PM EDT TUE JUN 16 2009 OHZ039-049-050-058-059-PAZ021-029>032-WVZ002>004-162300- ALLEGHENY PA-BELMONT OH-BROOKE WV-FAYETTE PA-GREENE PA-GUERNSEY OH-HARRISON OH-JEFFERSON OH-MARSHALL WV-OHIO WV-TUSCARAWAS OH-WASHINGTON PA-WESTMORELAND PA- 626 PM EDT TUE JUN 16 2009 ...SCATTERED THUNDERSTORMS MOVING ACROSS THE REGION... AT 625 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED AN AREA OF THUNDERSTORMS STRETCHING FROM CENTRAL GUERNSEY COUNTY IN EAST-CENTRAL OHIO ACROSS BELMONT COUNTY AND INTO MARSHALL COUNTY WEST VIRGINIA. MORE STORMS WERE MOVING INTO WASHINGTON AND WESTMORELAND COUNTIES IN PENNSYLVANIA. BE ALERT FOR FREQUENT DANGEROUS LIGHTNING...SMALL HAIL...BRIEF GUSTY WINDS TO NEAR 30 MPH AND VERY HEAVY DOWNPOURS. STORMS ARE LIKELY TO MOVE INTO SOUTHERN TUSCARAWAS AND HARRISON COUNTIES IN OHIO AS WELL AS OHIO COUNTY IN WEST VIRGINIA AND SOUTHERN ALLEGHENY COUNTY IN PENNSYLVANIA BETWEEN 700 PM AND 730 PM. THE STORMS WERE MOVING NORTH ABOUT 15 MPH.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 643 PM EDT TUE JUN 16 2009 OHZ050-059-PAZ029-031-WVZ002>004-162315- BELMONT OH-BROOKE WV-GREENE PA-JEFFERSON OH-MARSHALL WV-OHIO WV-WASHINGTON PA- 643 PM EDT TUE JUN 16 2009 ...STRONG THUNDERSTORM MOVING ACROSS MARSHALL AND OHIO COUNTIES... A STRONG THUNDERSTORM WAS ON THE MARSHALL AND OHIO COUNTY BORDER. IT WILL CONTINUE TO MOVE NORTH INTO OHIO COUNTY WEST VIRGINIA AND ASSO AFFECT WESTERN WASHINGTON COUNTY PENNSYLVANIA. THIS STORM CAN PRODUCE WINDS TO 40 MPH...SMALL HAIL TO ONE HALF INCH IN DIAMETER...DANGEROUS LIGHTNING AND HEAVY DOWNPOURS.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 711 PM EDT TUE JUN 16 2009 OHZ050-PAZ029-WVZ001>003-162345- BROOKE WV-HANCOCK WV-JEFFERSON OH-OHIO WV-WASHINGTON PA- 711 PM EDT TUE JUN 16 2009 ...THUNDERSTORMS... AT 710 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH SHOWED A STRONG THUNDERSTORM OVER OHIO COUNTY WEST VIRGINIA AND WESTERN WASHINGTON COUNTY PENNSYLVANIA. THE STORM WAS MOVING TO THE NORTH ABOUT 15 MPH. LOCATIONS IN THE PATH OF THE STORM INCLUDE BETHANY...DUNSFORT AND MCKINLEYVILLE. BE ALERT FOR DANGEROUS CLOUD TO GROUND LIGHTING...SMALL HAIL TO ONE HALF INCH...HEAVY DOWNPOURS AND WIND GUSTS TO NEAR 40 MPH. THE STORM WILL MOVE INTO SOUTHERN BROOKE COUNTY BY 730 PM.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 738 PM EDT TUE JUN 16 2009 OHZ050-PAZ020-021-029-030-WVZ001-002-170000- ALLEGHENY PA-BEAVER PA-BROOKE WV-HANCOCK WV-JEFFERSON OH-WASHINGTON PA-WESTMORELAND PA- 738 PM EDT TUE JUN 16 2009 ...STRONG THUNDERSTORMS ACROSS PARTS OF THE AREA... AT 737 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS MOVING INTO WASHINGTON COUNTY PENNSYLVANIA JUST WEST OF CROSS CREEK. ANOTHER STRONG STORM WAS IN WESTMORELAND COUNTY SOUTH OF MURRYSVILLE. THE STORMS WERE MOVING NORTH AT ABOUT 15 MPH. THE STORMS WILL AFFECT MURRYSVILLE AND DELMONT AS WELL AS AREAS NEAR BURGETTSTOWN BY 800 PM. LOOK FOR VERY HEAVY DOWNPOURS...SMALL HAIL TO ONE HALF INCH...DANGEROUS LIGHTING AND WINDS GUSTING TO NEAR 45 MPH.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 807 PM EDT TUE JUN 16 2009 PAZ022-023-030-170030- ARMSTRONG PA-INDIANA PA-WESTMORELAND PA- 807 PM EDT TUE JUN 16 2009 ...THUNDERSTORMS... THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTIES...ARMSTRONG AND ...WESTMORELAND... AT 804 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED THUNDERSTORMS NEAR APOLLO...MOVING NORTH AT 15 MPH. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... APOLLO... VANDERGRIFT... FREEPORT... CROOKED CREEK LAKE PARK... THESE STORMS ARE CAPABLE OF PRODUCING GUSTY WINDS TO NEAR 40 MPH...DANGEROUS LIGHTNING...SMALL HAIL AND BRIEF HEAVY DOWNPOURS. KEEP AN EYE TO THE SKY AND MOVE TO A SAFE PLACE IF THUNDERSTORMS APPROACH.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 813 PM EDT TUE JUN 16 2009 OHZ040-041-050-PAZ013-020-021-WVZ001-170045- ALLEGHENY PA-BEAVER PA-CARROLL OH-COLUMBIANA OH-HANCOCK WV-JEFFERSON OH-LAWRENCE PA- 813 PM EDT TUE JUN 16 2009 ...THUNDERSTORMS... THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTIES...COLUMBIANA...JEFFERSON...CARROLL...ALLEGHENY...BEAVER... AND HANCOCK... AT 804 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED THUNDERSTORMS SCATTERED FROM WESTERN ALLEGHENY COUNTY PENNSYLVANIA WESTWARD THROUGH SOUTHERN BEAVER COUNTY...HANCOCK COUNTY WEST VIRGINIA AND CONTINUING WEST ACROSS JEFFERSON...AND CARROLL COUNTIES IN OHIO. THE MOST ACTIVE STORM WAS NEAR EAST LIVERPOOL AND WILL AFFECT LA CROFT...FREDERICKTOWN AND ROCK CAMP IN EASTERN COLUMBIANA COUNTY BY 840 PM. BE ALERT FOR DANGEROUS LIGHTNING...SMALL HAIL...HEAVY DOWNPOURS AND BRIEF GUSTY WINDS TO NEAR 35 MPH. THE STORMS WERE MOVING NORTH ABOUT 15 MPH.
The Pittsburgh radar (KPBZ), 49 km away, was scanning. The volume nearest the first event began at 00:17 UTC.
1 thunderstorm wind. Local standard time, as filed.
Local television station reported trees and power lines down with roads blocked near Irwin.
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: 178231.