A nearly stationary frontal boundary across the upper Ohio valley was the focus for severe thunderstorms and some flooding across eastern Ohio, western Pennsylvania, and northern West Virginia.
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.
A nearly stationary frontal boundary across the upper Ohio valley was the focus for severe thunderstorms and some flooding across eastern Ohio, western Pennsylvania, and northern West Virginia.
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 4, 5:07 AM EST, 2 hours 13 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 607 AM EDT FRI JUN 4 2010 .SYNOPSIS... UNSETTLED WEATHER IS EXPECTED TO PERSIST THROUGH THE WEEKEND. && .NEAR TERM /THROUGH TONIGHT/... CURRENT ISOLATED THUNDERSTORMS ARE DEMONSTRATING THE DEGREE OF INSTABILITY OVER THE REGION. HOWEVER...WITH LITTLE TO FOCUS ADDITIONAL CONVECTION ON THIS MORNING...ISOLATED IS ALL THAT IS EXPECTED. LOW LEVEL MOISTURE HAS ALSO CONTRIBUTED TO PATCHY FOG...WHICH SHOULD DISSIPATE QUICKLY AFTER SUNRISE. DIURNAL EFFECTS WILL INCREASE CHANCE OF STORMS FOR THIS AFTERNOON...AS CAPES RUN UP TO CLOSE 1000. THE CHANCE FOR STORMS WILL CONTINUE IN TO TONIGHT AS A COOL FRONTAL BOUNDARY APPROACHES. WITH THIS ADDITIONAL FOCUS MECHANISM IN AN ALREADY UNSTABLE AIRMASS...A FEW OF THIS STORMS COULD GO SEVERE TONIGHT. && .SHORT TERM /SATURDAY THROUGH SUNDAY/... COOL FRONT WILL PASS EAST OF THE CWA EARLY SATURDAY...WITH SEVERE POTENTIAL LINGERING WITH IT INTO SATURDAY. ANOTHER SHOT FOR STRONG TO SEVERE STORMS WILL COME SATURDAY NIGHT INTO EARLY SUNDAY...AS THE MODELS HINT AT A MCS DEVELOPING JUST WEST OF THE CWA ON A WARM FRONT...THEN MOVING EAST ACROSS THE REGION OVERNIGHT INTO SUNDAY MORNING. AS FOR SATURDAY AFTERNOON...DIURNAL INSTABILITY WILL KEEP CHANCE OF STORMS GOING. NEAR SEASONAL TEMPS WILL BE EXPECTED THROUGH THIS PERIOD...ALTHOUGH SUNDAY MAY BE A FEW DEGREES BELOW NORMAL. && .LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/... THE UNSETTLED WEATHER PATTERN SHOULD BE NEARING ITS END SUNDAY NIGHT WITH MODEL AGREEMENT THAT A BROAD TROUGH WILL EXTEND FROM NEW ENGLAND INTO INTO THE GREAT LAKES. BEHIND A FRONTAL BOUNDARY DIVING SOUTH OF THE AREA ON SUNDAY...A COOLER AIR MASS SHOULD WORK ITS WAY IN...WITH SHOWERS POSSIBLE INTO MONDAY AS THE TROUGH ADVECTS EAST OF THE REGION. THERE IS MODEL AGREEMENT BETWEEN THE GFS AND ECMWF THAT HIGH PRESSURE WILL BUILD INTO THE AREA FROM THE NORTHWEST ON TUESDAY...WITH A DEEP LAYER OF DRY AIR ADVECTING INTO THE AREA. THE MID-LEVEL FLOW WILL BECOME MORE ZONAL WITH DEEP LAYER MOISTURE RETURNING TO THE AREA ON WEDNESDAY. THIS WILL ALLOW FOR A MORE DISTURBED PATTERN TO RETURN WITH A LOW PROGGED TO CROSS THE MISSOURI AND OHIO VALLEYS. WITH THIS PATTERN RETURNING...THERE IS THE CHANCE OF SHOWERS AND THUNDERSTORMS WEDNESDAY AFTERNOON. AS THE TROUGH MOVES EAST OF THE AREA ON MONDAY...A COOLER MID-LEVEL NORTHWESTERLY FLOW WILL ALLOW FOR TEMPERATURES AROUND 5 DEGREES BELOW NORMAL. AS THE LOW APPROACHES FROM THE WEST...MORE OF A SOUTHERLY COMPONENT TO THE FLOW WITH WAA WILL ALLOW FOR TEMPERATURES TO RETURN TO NORMAL SEASONAL VALUES TUESDAY AND WEDNESDAY. && .AVIATION /10Z FRIDAY THROUGH TUESDAY/... FOG AND AREAS OF LOW CLOUDS WILL PRODUCE MVFR/AREAS OF IFR THROUGH 13-14Z. BY LATE MORNING...VFR CUMULUS WILL BEGIN TO FORM...INCREASING THIS AFTN. SCATTERED SHWRS/TSTMS WILL DEVELOP ONCE AGAIN BY LATE AFTN...WITH MVFR CONDITIONS IN THE STRONGER ACTIVITY...WITH GUSTY TSTM WINDS AND SMALL HAIL POSSIBLE. LIGHT SURFACE WINDS THIS MORNING WILL BECOME SOUTHWEST 6-10 KT THIS AFTN. AFTER PERHAPS A BRIEF BREAK FROM SHWR/TSTM ACTIVITY LATE EVENING INTO THE OVERNIGHT...LOW PRESSURE WILL APPROACH FROM THE WEST...WITH SCATTERED SHWRS/TSTMS ENTERING EASTERN OH BY 10-12Z SAT...AND ACROSS WESTERN PA PORTS SATURDAY MORNING. LOW PRESSURE WILL CROSS THE AREA OVER THE WEEKEND...WITH A WARM MOIST AIR MASS ALLOWING FOR THE CHANCE OF SHOWERS AND THUNDERSTORMS WITH POSSIBLE RESTRICTIONS INTO NEXT MONDAY. HIGH PRESSURE WILL RETURN ON TUESDAY FOR VFR CONDITIONS. && .EQUIPMENT... THE WSR 88D AT PITTSBURGH...KPBZ...IS OPERATIONAL BUT IN DEGRADED MODE DUE TO LOW POWER OUTPUT. ADDITIONAL PARTS ARE ON ORDER AND MORE MAINTENANCE WILL BE COMPLETED DURING THE NEXT COUPLE OF DAYS. ALTERNATE RADARS INCLUDE KRLX...KILN...KCLE...AND KCCX. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 320 AM EDT FRI JUN 4 2010 OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>022-029- WVZ001>004-050730- TUSCARAWAS-CARROLL-COLUMBIANA-COSHOCTON-HARRISON-JEFFERSON OH- MUSKINGUM-GUERNSEY-BELMONT-NOBLE-MONROE-MERCER-VENANGO-FOREST- LAWRENCE-BUTLER-CLARION-JEFFERSON PA-BEAVER-ALLEGHENY-ARMSTRONG- WASHINGTON-HANCOCK-BROOKE-OHIO-MARSHALL- 320 AM EDT FRI JUN 4 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL OHIO...NORTHWEST PENNSYLVANIA...SOUTHWEST PENNSYLVANIA...WEST CENTRAL PENNSYLVANIA AND NORTHERN PANHANDLE OF WEST VIRGINIA. .DAY ONE...TODAY AND TONIGHT. THERE IS A SLIGHT CHANCE FOR SEVERE WEATHER TONIGHT. THE MAIN HAZARDS WILL BE STRONG WINDS AND HAIL. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. THERE IS A SLIGHT CHANCE FOR SEVERE WEATHER EARLY SATURDAY...AND AGAIN SATURDAY NIGHT INTO SUNDAY. THE MAIN HAZARDS WILL BE STRONG WINDS AND HAIL. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. MDZ001-PAZ023-030>032-WVZ012-021>023-041-050730- GARRETT-INDIANA-WESTMORELAND-GREENE-FAYETTE-WETZEL-MARION-MONONGALIA- PRESTON-TUCKER- 320 AM EDT FRI JUN 4 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MARYLAND...SOUTHWEST PENNSYLVANIA...WEST CENTRAL PENNSYLVANIA AND NORTHERN WEST VIRGINIA. .DAY ONE...TODAY AND TONIGHT. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. THERE IS A SLIGHT RISK FOR SEVERE WEATHER SATURDAY MORNING...THEN AGAIN SATURDAY NIGHT INTO SUNDAY. THE MAIN HAZARDS WILL BE STRONG WINDS AND HAIL. .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
259 AM EDT FRI JUN 4 2010
OHZ068-069-040800-
MONROE OH-NOBLE OH-
259 AM EDT FRI JUN 4 2010
...THUNDERSTORMS...
THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTIES...
MONROE AND NOBLE...
AT 254 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH
INDICATED STRONG THUNDERSTORMS 5 MILES NORTHWEST OF HARRIETTSVILLE...
MOVING EAST AT 20 MPH. WIND GUSTS TO 45 MPH AND PEA SIZED HAIL IS
POSSIBLE.
SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE...
HARRIETTSVILLE... LEWISVILLE... GRAYSVILLE...
WOODSFIELD... ANTIOCH... BENWOOD...
ROUND BOTTOM... HANNIBAL... CLARINGTON...
CAMERON...
KEEP AN EYE TO THE SKY AND MOVE TO A SAFE PLACE IF THUNDERSTORMS
APPROACH.
PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL
WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772.
LAT...LON 3985 8089 3984 8084 3979 8084 3975 8087
3972 8083 3970 8083 3968 8086 3963 8088
3959 8097 3960 8140 3962 8142 3964 8147
3978 8148The national radar mosaic for the moment the first event began.
4 thunderstorm wind, 3 hail. Local standard time, as filed.
Law enforcement reported trees down in Finleyville.
Emergency management reported trees down in Cross Creek.
The public reported large branches broken in Canonsburg.
Emergency management reported several trees down on power lines north of Thomas on Taylor Drive.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2010Every state in 2010This day in weather historyWarnings in Pennsylvania, June 2010
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: 230277, 230279, 230273, 230280, 230274, 230284, 230276.