Scattered severe thunderstorms developed well ahead of a cold front in an unstable airmass.
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 severe thunderstorms developed well ahead of a cold front in an unstable airmass.
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 Apr 25, 11:54 AM EST, 1 hour 58 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 1254 PM EDT MON APR 25 2011 .SYNOPSIS... A WARM FRONT NORTH OF INTERSTATE 80 THIS AFTERNOON WILL CONTINUE TO MOVE NORTH WITH WARM AND HUMID AIR ACROSS THE REGION. SCATTERED SHOWERS AND THUNDERSTORMS WILL BECOME MORE WIDESPREAD LATER THIS AFTERNOON INTO EARLY EVENING. THE CHANCE OF SHOWERS AND THUNDERSTORMS WITH UNSEASONABLY WARM TEMPERATURES WILL CONTINUE UNTIL A COLD FRONT PASSES ON THURSDAY. BEHIND THIS FRONT SEASONABLE TEMPERATURES CAN BE EXPECTED FOR LATE WEEK. && .NEAR TERM /THROUGH TONIGHT/... EARLY AFTERNOON UPDATE TO RAISE MAX TEMPS A DEGREE IN THE SOUTH AND RECONFIGURE POPS TO LOWER SOUTHEAST RIDGES AND TOWARD LIKELY LATE DAY IN EASTERN OHIO AS UPPER LEVEL IMPULSE MOVES NORTHEAST FROM SOUTHWEST OHIO. LOWER POPS LATER THIS EVENING AS THIS AREA MOVES EAST. && .SHORT TERM /TUESDAY THROUGH TUESDAY NIGHT/... CENTRAL PLAINS TROUGH IS FORECAST TO DIG TOWARD THE WESTERN GREAT LAKES/UPPER MISSISSIPPI VALLEY REGION AND CUTOFF ON TUESDAY. THAT PATTERN WILL YIELD SPLIT FLOW WITH FAST SOUTHERN STREAM OVER THE UPPER OHIO VALLEY REGION. RESULTING WARMTH AND MOISTURE WILL DESTABILIZE THE ATMOSPHERE WITH MODERATE TO HIGH LEVELS OF SHEAR IN THE RAPID FLOW. AS SHORTWAVES MOVE THROUGH THIS PATTERN, THUNDERSTORMS MAY BE EXPECTED INTO MID WEEK WITH POTENTIAL FOR A SLIGHT RISK OF SEVERE STORMS THROUGH WEDNESDAY. TEMPERATURES WILL REMAIN WELL ABOVE NORMAL. && .LONG TERM /WEDNESDAY THROUGH SUNDAY/... A COLD FRONT WILL CROSS THE AREA WEDNESDAY NIGHT INTO THURSDAY WITH LIKELY POPS FOR ALL AREAS. MODELS BEGIN TO DIFFER BY THURSDAY NIGHT ON HANDLING THE POST FRONTAL UPPER TROUGH...WITH THE ECMWF DIGGING THE TROUGH ACROSS THE GREAT LAKES KEEPING AN UNSETTLED PATTERN ACROSS THE REGION THROUGH FRIDAY...AND THE GFS MORE PROGRESSIVE PUSHING THE UPPER TROUGH INTO EASTERN CANADA THURSDAY NIGHT. WILL SPLIT THE DIFFERENCE...WITH LINGERING LOW END CHANCE POPS POST FRONTAL INTO THURSDAY NIGHT...WITH RESIDUAL PRECIP EXITING ON FRIDAY. SHORTWAVE RIDGING WILL BRING DRY CONDITIONS FOR SATURDAY...WITH ANOTHER SYSTEM PROGGED TO ENTER THE REGION SUNDAY FOR A CHANCE OF SHOWERS. SEASONABLY COOL TEMPERATURES LATE IN THE WEEK WILL WARM TO NEAR NORMAL FOR THE UPCOMING WEEKEND. && .AVIATION /18Z MONDAY THROUGH SATURDAY/... VFR CONDITIONS WILL PREVAIL FOR THE MAJORITY TODAY AS A FRONTAL BOUNDARY ALONG A KFKL-KDUJ LINE PUSHES SLOWLY NORTHWARD. ALONG THE BOUNDARY NEAR LIFR CEILINGS AT KDUJ AND MVFR AT KFKL WILL LIFT TO VFR EARLY THIS AFTERNOON. SCATTERED THUNDERSTORMS WILL DEVELOP IN THE WARM SECTOR THIS AFTERNOON. TEMPO GROUPS FOR -TSRA ARE FORECAST KHLG/KZZV WITH THE MOST CONFIDENCE THERE. THE OTHER TERMINALS HAVE PREVAILING CB GROUPS AT THE MOMENT WHICH MAY NEED TEMPO GROUPS ADDED IN FUTURE UPDATES. CONDITIONS WILL SOMEWHAT DETERIORATE TONIGHT, AS ANOTHER WAVE MOVES THROUGH THE UPPER OHIO VALLEY. EXPECT ANOTHER ROUND OF RESTRICTIONS DURING THE EVENING AND EARLY OVERNIGHT HOURS. THIS MAY BE THE BEST TIME TO SEE A LINE OF CONVECTION DEVELOP. THE FRONTAL BOUNDARY WILL CONTINUE TO MEANDER ACROSS THE REGION FOR TUESDAY AND WEDNESDAY...WITH THE SYSTEMS COLD FRONT CROSSING THE AREA WEDNESDAY NIGHT INTO THURSDAY. EXPECT PERIODS OF SHOWERS AND RESTRICTIONS...WITH GREATER COVERAGE LATE WEDNESDAY AFTERNOON INTO THURSDAY ALONG/IMMEDIATELY IN THE WAKE OF THE COLD FRONT. RESIDUAL SHOWERS AND RESTRICTIONS ARE LIKELY LATE THURSDAY INTO FRIDAY AS UPPER LEVEL LOW PRESSURE GRADUALLY EXITS TO THE NORTHEAST. HIGH PRESSURE AND VFR ARE EXPECTED TO RETURN TO THE AREA FRIDAY. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 251 PM EDT MON APR 25 2011 OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-029- 031-073>076-WVZ001>004-261900- 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-GREENE-WESTMORELAND-WESTMORELAND RIDGES-FAYETTE- FAYETTE RIDGES-HANCOCK-BROOKE-OHIO-MARSHALL- 251 PM EDT MON APR 25 2011 ...SEVERE THUNDERSTORM WATCH 202 IN EFFECT UNTIL 10 PM EDT THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL OHIO...NORTHWEST PENNSYLVANIA...SOUTHWEST PENNSYLVANIA...WEST CENTRAL PENNSYLVANIA AND NORTHERN PANHANDLE OF WEST VIRGINIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. SEVERE THUNDERSTORM WATCH. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS ON TUESDAY AND WEDNESDAY. SEVERE THREATS ON BOTH DAYS WILL AGAIN COME PRIMARILY FROM DAMAGING WIND GUSTS AND LARGE HAIL. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. MDZ001-WVZ012-021>023-041-261900- GARRETT-WETZEL-MARION-MONONGALIA-PRESTON-TUCKER- 251 PM EDT MON APR 25 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MARYLAND AND NORTHERN WEST VIRGINIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS ON TUESDAY AND WEDNESDAY. SEVERE THREATS ON BOTH DAYS WILL AGAIN COME PRIMARILY FROM DAMAGING WIND GUSTS AND LARGE 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 139 PM EDT MON APR 25 2011 PAZ014-015-022-251815- ARMSTRONG PA-BUTLER PA-CLARION PA- 139 PM EDT MON APR 25 2011 ...A STRONG THUNDERSTORM TO MOVE THROUGH THE FOLLOWING COUNTIES...ARMSTRONG...BUTLER AND CLARION... AT 136 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS 5 MILES WEST OF SAXONBURG...MOVING NORTHEAST AT 45 MPH. THIS STORM WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WINDS GUSTING UP TO 40 MPH. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... SAXONBURG... BUTLER... CHICORA... BRADYS BEND... EAST BRADY... 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 4108 7968 4090 7945 4068 7991 4081 8005 WOODRUM
The State College radar (KCCX), 91 km away, was scanning. The volume nearest the first event began at 18:51 UTC.
8 thunderstorm wind. Local standard time, as filed.
Emergency management reported trees and powerlines down in Coolspring.
Emergency management reported trees and powerlines down blocking Hungry Hook Road.
Emergency management reported multiple trees down on Barton Chapel Road with 2 homes with minor damage. Small hail also covered the ground.
Emergency management reported trees and powerlines down near President.
Emergency management reported trees and power lines down in Henrys Bend.
Emergency management reported a large tree down along Route 36 near Tionesta.
The public reported trees down with a few vehicles damaged.
Emergency management reported 13 structures with some damage as well as numerous large trees down.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2011Every state in 2011This day in weather historyWarnings in Pennsylvania, April 2011
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: 295642, 295643, 295644, 295646, 295647, 295648, 295649, 295650.