A line of showers and thunderstorms developed ahead of a passing shortwave late on the 13th. The thunderstorms produced heavy rain over Allegheny and Westmoreland counties, with flash flooding reported near Leechburgh and Vandergrift.
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 line of showers and thunderstorms developed ahead of a passing shortwave late on the 13th. The thunderstorms produced heavy rain over Allegheny and Westmoreland counties, with flash flooding reported near Leechburgh and Vandergrift.
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 Jul 13, 7:07 PM EST, 36 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE PITTSBURGH PA 807 PM EDT MON JUL 13 2015 .SYNOPSIS... SHOWERS AND THUNDERSTORMS WILL BECOME MORE NUMEROUS TUESDAY AND TUESDAY NIGHT AS A COLD FRONT APPROACHES. LESS HUMID CONDITIONS WILL RETURN LATER WEDNESDAY INTO FRIDAY. && .NEAR TERM /UNTIL 6 AM TUESDAY MORNING/... 800PM UPDATE...LINE OF VERY LIGHT SHOWERS/SPRINKLES HAS DEVELOPED AHEAD OF CROSSING SHORTWAVE. EAST OF THIS LINE...CONVECTION HAS POPPED UP WITH A FEW STROKES OF LIGHTNING. THESE STORMS ARE NOT LASTING LONG...BUT WILL LIKELY CONTAIN BRIEF HEAVY DOWNPOURS. THE UPPER LEVEL WAVE SPARKING THIS ACTIVITY WILL CLEAR THE AREA LATER THIS EVENING...ALLOWING FOR A PERIOD OF DRY WEATHER AND DECREASED CLOUD COVER OVERNIGHT. PREVIOUS DISCUSSION... CONVECTIVE COMPLEX DIVING SOUTH FROM OHIO WILL MOVE INTO KENTUCKY AND WEST VIRGINIA THIS EVENING WITH ONLY A FEW SHOWERS INTO EASTERN OHIO DIMINISHING AS THEY MOVE EAST. OTHERWISE SCATTERED SHOWERS ACROSS THE RIDGES WILL WEAKEN WITH LOSS OF DAYTIME HEATING. LITTLE CHANGE TO TEMPERATURES FROM PREVIOUS FORECAST WITH DEW POINTS REMAINING ELEVATED WELL INTO THE 60S. BETTER CHANCES FOR WIDESPREAD SHOWERS AND THUNDERSTORMS WILL BE TUESDAY AFTERNOON AS A STRONGER UPPER LEVEL SHORTWAVE AND TROUGH APPROACHES...WITH AN ASSOCIATED COLD FRONT. LIKELY POPS BY AFTERNOON. SEVERE OR FLASH FLOOD THREAT STILL SEEMS ON THE UNCERTAIN SIDE WITH TIMING AND AMOUNT OF LOW LEVEL INSTABILITY. LEFT MENTION OF ISOLATED FLOOD THREAT LATER TUESDAY FOR NOW. && .SHORT TERM /6 AM TUESDAY MORNING THROUGH THURSDAY/... BULK OF DEEP MOISTURE WITH UPPER TROUGH AND COLD FRONT WILL CROSS REGION TUESDAY NIGHT WITH LIKELY POPS. COLD FRONT SWEEPS EAST BY WEDNESDAY AFTERNOON WITH LOWER SHOWER CHANCES AS THE DAY PROGRESSES. DRIER AND COOLER AIR WEDNESDAY NIGHT INTO EARLY FRIDAY AS A BUBBLE OF HIGH PRESSURE SINKS SOUTHEAST. && .LONG TERM /THURSDAY NIGHT THROUGH MONDAY/... DRY INTERLUDE ENDS BY FRIDAY AFTERNOON AS A WARM FRONT ADVANCES FROM THE SOUTHWEST...WITH DECENT RAIN CHANCES FOR SATURDAY. ZONAL FLOW ON TOP OF A FLAT RIDGE WILL BRING CHANCE POPS FROM QUICK MOVING SYSTEMS THROUGH THE WEEKEND INTO MONDAY. TEMPERATURES WILL BE NEAR SEASONAL NORMS. && .AVIATION /00Z TUESDAY THROUGH SATURDAY/... THUNDERSTORM COMPLEX DIVING SOUTH BEFORE IT GETS TO THE AREA. SOME RESIDUAL SHOWER ACTIVITY TRAILING OFF FROM THE MAIN COMPLEX WILL CLIP THE WESTERN HALF OF THE AREA. ALSO A FEW SHOWERS POPPING OVER THE MOUNTAIN RIDGES. WARM FRONT WILL BE THE FOCUS FOR MORE SHOWERS ACROSS THE REGION. DEEPER MOISTURE AND MORE VIGOROUS WAVE WILL RESULT IN ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS TUESDAY. LIGHT FOG IS POSSIBLE AGAIN TONIGHT AS THE BOUNDARY LAYER STAYS WELL MOISTENED. OUTLOOK...NON VFR IN WIDESPREAD SHRA/TSRA INTO TUE NIGHT THEN NON VFR CIGS MAY LINGER WELL INTO WED. AREAS OF NON VFR IN SHRA AND TSRA SHOULD RETURN ON FRI. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 820 AM EDT MON JUL 13 2015 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029-031-073>076-WVZ001>004-012-021>023-041-141230- 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-GREENE-WESTMORELAND-WESTMORELAND RIDGES- FAYETTE-FAYETTE RIDGES-HANCOCK-BROOKE-OHIO-MARSHALL-WETZEL-MARION- MONONGALIA-PRESTON-TUCKER- 820 AM EDT MON JUL 13 2015 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. HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. SHOWERS AND THUNDERSTORMS WITH HEAVY RAINFALL ARE POSSIBLE TUESDAY NIGHT. WITH CONTINUED SATURATED GROUND...FLOODING IS A POSSIBILITY. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Pittsburgh radar (KPBZ), 53 km away, was scanning. The volume nearest the first event began at 00:41 UTC.
1 flash flood. Local standard time, as filed.
State official reported that several vehicles were stranded on Route 356 at South Leechburg Hill. In addition, flooding was being reported at Allegheny Ludlum.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2015Every state in 2015This day in weather historyWarnings in Pennsylvania, July 2015
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: 594654.