Scattered severe thunderstorms developed across western Pennsylvania in the late afternoon of the 10th well ahead of a cold front crossing Ohio.
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 across western Pennsylvania in the late afternoon of the 10th well ahead of a cold front crossing Ohio.
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 May 10, 1:44 PM EST, 16 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 244 PM EDT FRI MAY 10 2013 .SYNOPSIS... SHOWERS AND THUNDERSTORMS WILL ACCOMPANY A COLD FRONT AS IT APPROACHES AND PASSES THROUGH THE REGION OVERNIGHT INTO SATURDAY. MUCH COOLER CONDITIONS SUNDAY AND MONDAY. && .NEAR TERM /THROUGH SATURDAY/... LEAD IMPULSE MOVING ACROSS KENTUCKY WITH LARGE AREA OF SHOWERS AND THUNDERSTORMS WILL CROSS THE REGION THIS EVENING FOLLOWED BY MAIN COLD FRONT LATER TONIGHT INTO EARLY SATURDAY WITH ADDITIONAL SHOWERS AND STORMS. JUST ENOUGH DAYTIME WARMING TO CREATE CAPE VALUES NEAR 1000 J/KG AND WHILE A FEW STORMS MAY PRODUCE WIND GUSTS OVER 40KTS THIS EVENING NO WIDESPREAD SEVERE WEATHER IS EXPECTED. FRONT WILL PUSH EAST OF THE RIDGES DURING THE DAY SATURDAY WITH TEMPERATURES NOT MOVING MUCH FROM MORNING LOWS. SHOWERS WILL DECREASE WEST TO EAST DURING THE DAY DRIER AIR MOVES IN BEHIND FRONT. && .SHORT TERM /SATURDAY NIGHT THROUGH MONDAY/... A SECONDARY COLD FRONT WILL MOVE QUICKLY SOUTH AND EAST ACROSS REGION SATURDAY NIGHT WITH CHANCE POPS FOR SHOWERS. BEHIND THIS FRONT SIGNIFICANTLY COLDER AT THE SURFACE AND ALOFT. HAVE KEPT SLIGHT CHANCE POPS ACROSS THE NORTH SUNDAY AFTERNOON IN COLD FLOW OF THE LAKES AND COLD POOL ALOFT. SURFACE RIDGE WILL BEGIN TO BUILD IN ACROSS REGION BY SUNDAY NIGHT CLEARING SKIES AND ALLOWING TEMPERATURES TO FALL WELL INTO THE 30S. FROST OR FREEZE POSSIBLE SUNDAY NIGHT AND WILL HIGHLIGHT IN HWO. OVERALL TEMPERATURES JUST A BIT UNDER MODEL MOS. && .LONG TERM /MONDAY NIGHT THROUGH FRIDAY/... MDL ENSEMBLES AND HPC CHARTS SHOW HIGH PRES IN CTRL ERLY IN THE WEEK. A WRMFNT WL APRCH AND PASS E THRU THE AREA WED INTO WED NGT. MDLS INDICATE SOME LMTD INSTAB WITH THE FNT SO INCLUDED CHC POPS FOR SHWRS/TSTMS. MDL SOLNS DIFFER LATE IN THE PD...HOWEVER PREFERED THE SLOWER ENSEMBLE SOLNS BRINGING A CDFNT SLOWLY THRU THE AREA FRI. KEPT LOW CHC POPS ATTM DUE TO TIMING UNCERTAINTIES. EXP COOL TEMPS ERLY IN THE WEEK...WITH ABV SEASONAL AVG READINGS RETURNING BY WED. && .AVIATION /19Z FRIDAY THROUGH WEDNESDAY/... VFR CONDS THIS AFTN WL DROP TO MVFR AS SHWRS/TSTMS MOVE IN AHD OF AN APRCHG CDFNT. MENTIONED A PD OF TSTMS LT THIS AFTN...ALTHOUGH WHERE INSTAB IS LESS N OF I 80 KEPT VCTS AS TSTM COVG SHOULD BE MORE QUESTIONABLE THERE. CIGS SHOULD CONT TO LWR TNGT THRU MVFR TO IFR OVRNGT. EXP FROPA AND A WSHFT TO THE WNW SAT MRNG WITH CIGS GRDLY LIFTG BACK TO MVFR. .OUTLOOK.../SATURDAY NIGHT THROUGH WEDNESDAY/... RESTRNS ARE PSBL WITH A SECONDARY CDFNT SAT EVE...THEN VFR CONDS EXPD WITH BLDG HIGH PRES INTO ERLY NXT WK. RESTRNS PSBL WED AS A WRMFNT APRCHS. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 252 PM EDT FRI MAY 10 2013 OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-029- 031-073>076-WVZ001>004-012-021>023-111900- 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-WETZEL-MARION-MONONGALIA- PRESTON- 252 PM EDT FRI MAY 10 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL OHIO...NORTHWEST PENNSYLVANIA...SOUTHWEST PENNSYLVANIA...WEST CENTRAL PENNSYLVANIA...NORTHERN WEST VIRGINIA AND NORTHERN PANHANDLE OF WEST VIRGINIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND THIS EVENING. THE PRIMARY THREAT IS DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. FROST IS POSSIBLE AT DAWN MONDAY AND TUESDAY WITH CANADIAN AIR BUILDING INTO THE AREA. THOSE WITH SENSITIVE PLANTS NEED TO MONITOR FUTURE FORECASTS TO DETERMINE IF ACTION IS REQUIRED. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. MDZ001-WVZ041-111900- GARRETT-TUCKER- 252 PM EDT FRI MAY 10 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MARYLAND AND NORTHERN WEST VIRGINIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND THIS EVENING. THE PRIMARY THREAT IS DAMAGING WIND GUSTS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. 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
243 PM EDT FRI MAY 10 2013
OHZ039-040-049-050-058-059-068-069-WVZ002>004-012-101945-
BELMONT OH-BROOKE WV-CARROLL OH-GUERNSEY OH-HARRISON OH-JEFFERSON OH-
MARSHALL WV-MONROE OH-NOBLE OH-OHIO WV-TUSCARAWAS OH-WETZEL WV-
243 PM EDT FRI MAY 10 2013
...STRONG THUNDERSTORMS WILL AFFECT BELMONT...GUERNSEY...HARRISON...
MARSHALL...NORTH CENTRAL WETZEL...NORTHEASTERN NOBLE...NORTHERN
MONROE...OHIO...SOUTHEASTERN TUSCARAWAS...SOUTHERN BROOKE...SOUTHERN
JEFFERSON AND SOUTHWESTERN CARROLL COUNTIES...
AT 241 PM EDT...STRONG THUNDERSTORMS WERE ALONG A LINE FROM 3 MILES
WEST OF CAMBRIDGE TO 5 MILES NORTHEAST OF WOODSFIELD TO 5 MILES EAST
OF FAIRVIEW...MOVING NORTHEAST AT 30 MPH.
WIND GUSTS TO 40 MPH AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS.
LOCATIONS IMPACTED INCLUDE...
PROCTOR... FAIRVIEW... WOODSFIELD...
SENECAVILLE... SENECA LAKE PARK... ROUND BOTTOM...
CLARINGTON... CAMERON... BYESVILLE...
WOODLANDS... CAMBRIDGE... SOMERTON...
HIGHWAYS IMPACTED INCLUDE...
I-470 IN WEST VIRGINIA BETWEEN MILE MARKERS 0 AND 3.
I-470 IN OHIO BETWEEN MILE MARKERS 0 AND 6.
I-70 IN WEST VIRGINIA BETWEEN MILE MARKERS 0 AND 14.
I-70 IN OHIO BETWEEN MILE MARKERS 171 AND 225.
I-77 IN OHIO BETWEEN MILE MARKERS 37 AND 65.
PLEASE REPORT SIGNIFICANT WEATHER BY CALLING...412-262-1988...POSTING
TO THE NWS PITTSBURGH FACEBOOK PAGE...OR USING TWITTER
@NWSPITTSBURGH.
LAT...LON 4009 8172 4050 8138 4027 8068 4025 8052
3982 8052 3968 8065 3975 8112 3995 8173
07The Pittsburgh radar (KPBZ), 70 km away, was scanning. The volume nearest the first event began at 19:00 UTC.
20 thunderstorm wind, 2 hail. Local standard time, as filed.
Home had roof damage on Morris Street.
Trees and wires were reported down in Carnegie, Green Tree, and Scott Township.
The public reported a tree down near Ben Avon.
The public reported a tree down on a power line.
The 911 call center reported trees and power lines down around Freeport.
An NWS storm survey showed a narrow swath of sporadic tree damage from near Airport Road and State Route 8 to near Mushrush Road and Winters Road. Damage included a large tree uprooted along State Route 8, along with downed limbs and small trees snapped.
An NWS storm survey found a swath of damage from near Little Stone Lane and Crisswell Road to near Freeport Road and Phil Mar Drive. Considerable tree damage was encountered along Saxonburg Road, where several trees of large diameter were snapped 10 feet above ground. Additional trees were uprooted and large limbs snapped.
An NWS storm survey found sporadic tree damage along Herman Road east of Butler. A few limbs were snapped and a medium sized diameter tree was snapped 20 to 30 Feet above the ground.
The public reported a tree down on a car at the intersection of SR 8 and SR 422.
The public reported trees down west of Kittanning.
Emergency management reported a tree down in Callensburg.
Emergency management reported trees down in Dunkard and Perry Township.
The 911 call center reported trees and wires down near Limestone.
The 911 call center reported trees and wires down.
The 911 call center reported trees and wires down in Clarion.
Trees and power lines were reported down in Uniontown.
The 911 call center reported trees and wires down in Mount Pleasant.
The 911 call center reported trees and wires down.
The 911 call center reported trees and wires down near Ligonier.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2013Every state in 2013This day in weather historyWarnings in Pennsylvania, May 2013
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: 444086, 444088, 444083, 444084, 444093, 444094, 444095, 444098, 444099, 444100, 444101, 444102, 444104, 444106, 444107, 444114, 444110, 444109, 444116, 444113, 444117, 444112.