Alert archive / Pennsylvania / Flash Flood Warnings in 2008
Flash Flood Warning 19, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Jul 23, 2008, 1:13 PM EDT for Allegheny County, Westmoreland County, Pennsylvania. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 23, 2008, 1:13 PM EDT (17:13 UTC)
- Expired
- Jul 23, 2008, 4:15 PM EDT
- In force
- 3 hr
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Allegheny County, PA, Westmoreland County, PA
The radar
The Pittsburgh radar (KPBZ), 45 km from the middle of the area, began a volume at 17:15 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 5.2 hours before the alert went out and 255 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 156 J/kg
- Mixed-layer CIN
- -226 J/kg
- Mixed-layer LCL
- 992 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 62 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
What forecasters said that day
The local office's own words before this flash flood warning went out, 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 this flash flood warning went out at Jul 23, 10:10 AM EDT, 3 hours 3 minutes earlier.
Area forecast discussion, Jul 23, 10:10 AM EDT, 3 hours 3 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 1010 AM EDT WED JUL 23 2008 .SYNOPSIS... A COLD FRONT WILL CROSS THE REGION TODAY...WITH SHOWERS DIMINISHING. HIGH PRESSURE WILL BUILD INTO THE REGION THURSDAY...BRINGING DRY AND SEASONABLY COOL CONDITIONS. THE NEXT FRONTAL SYSTEM WILL IMPACT THE AREA OVER THE WEEKEND. && .NEAR TERM /THROUGH TONIGHT/... THE SURFACE COLD FRONT IS CROSSING EASTERN OH/NW PA CURRENTLY...WITH SHOWERS EXITING THE EASTERN RIDGES...AND THE PARENT UPPER LOW NUDGING EAST ACROSS THE GREAT LAKES. FOR THIS AFTN...RESIDUAL INSTABILITY TO THE EAST OF THE COLD FRONT COULD RESULT IN REDEVELOPMENT OF SHWRS/TSTMS ACROSS THE RIDGES...SO WILL KEEP POPS SCATTERED EAST OF PITTSBURGH THIS AFTN/EVENING. TO THE NORTH...A WAVE ROTATING AROUND THE UPPER LOW COULD PROVIDE ENOUGH LIFT/INSTABILITY TO GENERATE A FEW SHWRS/TSTMS NORTH OF PITTSBURGH THIS AFTN/EARLY EVENING. FROM PITTSBURGH SOUTH AND WEST...EXPECT LITTLE IF ANY PRECIP. PRECIP WILL GRADUALLY DIMINISH FOR ALL AREAS TONIGHT. && .SHORT TERM /THURSDAY THROUGH THURSDAY NIGHT/... HIGH PRESSURE WILL BRING DRY WEATHER FOR THURSDAY INTO THURSDAY NIGHT WITH NEAR NORMAL TEMPERATURES. && .LONG TERM /FRIDAY THROUGH TUESDAY/... MEDIUM RANGE MODELS CONTINUE TO BE IN DECENT AGREEMENT BRINGING THE NEXT FRONTAL BOUNDARY ACROSS THE REGION SATURDAY...WITH PERHAPS A SECONDARY COLD FRONT FOR SUNDAY. WILL KEEP CHANCE POPS FOR SAT/SUN. SOME DIFFERENCES FOR EARLY NEXT WEEK...WITH THE GFS SHOWING YET ANOTHER WAVE CROSSING THE AREA...AND THE ECMWF SHOWING THE FEATURE DEPARTING TO THE SOUTH. WILL KEEP MINIMAL RESIDUAL CHANCES FOR MONDAY...WITH DRY CONDITIONS FOR TUESDAY. NEAR NORMAL TEMPERATURES WILL PREVAIL FOR THE LONG TERM. && .AVIATION /14Z WEDNESDAY THROUGH SUNDAY/... SHOWERS ARE EXITING THE RIDGES...WITH LOW CLOUDS AND MVFR/IFR PERSISTING BEHIND THE PRECIP SHIELD. CONDITIONS WILL IMPROVE TO VFR FOR MOST AREAS THIS AFTN AS THE COLD FRONT CROSSES THE REGION. LOW PRESSURE SYSTEM WILL PUSH SLOWLY EASTWARD LATER TODAY AND VFR CONDITIONS SHOULD PREVAIL TONIGHT THROUGH FRIDAY AS ATMOSPHERE DRIES OUT. PATCHY EARLY MORNING FOG COULD CAUSE VISIBILITY RESTRICTIONS. ANOTHER FRONT WILL MOVE INTO THE UPPER OHIO VALLEY SATURDAY AND SUNDAY RAISING THE CHANCES OF SHOWERS AND THUNDERSTORMS AND POSSIBLE MVFR CONDITIONS. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. &&
Hazardous weather outlook, Jul 23, 5:04 AM EDT, 8 hours 9 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 504 AM EDT WED JUL 23 2008 MDZ001-PAZ008-009-014>016-021>023-029>032-WVZ021>023-041-240915- GARRETT-VENANGO-FOREST-BUTLER-CLARION-JEFFERSON PA-ALLEGHENY- ARMSTRONG-INDIANA-WASHINGTON-WESTMORELAND-GREENE-FAYETTE-MARION- MONONGALIA-PRESTON-TUCKER- 504 AM EDT WED JUL 23 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MARYLAND...NORTHWEST PENNSYLVANIA...SOUTHWEST PENNSYLVANIA...WEST CENTRAL PENNSYLVANIA AND NORTHERN WEST VIRGINIA. .DAY ONE...TODAY AND TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS TODAY. THE PRIMARY SEVERE WEATHER THREAT WILL BE DAMAGING THUNDERTORM WINDS AND A CHANCE OF LARGE HAIL. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. OHZ039>041-048>050-057>059-068-069-PAZ007-013-020-WVZ001>004-012- 240915- TUSCARAWAS-CARROLL-COLUMBIANA-COSHOCTON-HARRISON-JEFFERSON OH- MUSKINGUM-GUERNSEY-BELMONT-NOBLE-MONROE-MERCER-LAWRENCE-BEAVER- HANCOCK-BROOKE-OHIO-MARSHALL-WETZEL- 504 AM EDT WED JUL 23 2008 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...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
In the hours before
Special weather statement, Jul 23, 7:19 AM EDT, 5 hours 54 minutes before
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</html>Special weather statement, Jul 23, 9:11 AM EDT, 4 hours 2 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 911 AM EDT WED JUL 23 2008 MDZ001-WVZ023-041-231530- GARRETT-PRESTON-TUCKER- INCLUDING THE CITIES OF...OAKLAND MD...GRANTSVILLE...KINGWOOD... TERRA ALTA...PARSONS...DAVIS...THOMAS 911 AM EDT WED JUL 23 2008 SHOWERS AND ISOLATED THUNDERSTORMS WILL CONTINUE TO CROSS PRESTON...GARRETT...AND TUCKER COUNTIES FOR THE REMAINDER OF THIS MORNING. ADDITIONAL RAINFALL OF ONE HALF TO LOCALLY ONE INCH IS POSSIBLE. TRAVELERS SHOULD BE ALERT FOR RAPID REDUCTIONS IN VISIBILITY...AND FOR PONDING OF WATER ON ROADWAYS.
Special weather statement, Jul 23, 11:48 AM EDT, 1 hour 25 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 1148 AM EDT WED JUL 23 2008 PAZ014-015-021-022-029>032-WVZ003-004-012-231700- BUTLER-CLARION-ALLEGHENY-ARMSTRONG-WASHINGTON-WESTMORELAND-GREENE- FAYETTE-OHIO-MARSHALL-WETZEL- INCLUDING THE CITIES OF...BUTLER...ZELIENOPLE...CLARION... PITTSBURGH METRO AREA...KITTANNING...FORD CITY...LEECHBURG... FREEPORT...APOLLO...WASHINGTON...CANONSBURG...DONORA... CALIFORNIA...CHARLEROI...MONONGAHELA...MCMURRAY...GREENSBURG... NEW KENSINGTON...JEANNETTE...LATROBE...MONESSEN...WAYNESBURG... FAIRDALE...UNIONTOWN...CONNELLSVILLE...OHIOPYLE...WHEELING... MOUNDSVILLE...NEW MARTINSVILLE 1148 AM EDT WED JUL 23 2008 A LINE OF SHOWERS AND ISOLATED THUNDERSTORMS WILL MOVE EAST AT 20 MPH EXTENDING FROM ARMSTRONG COUNTY PENNSYLVANIA SOUTH TO WETZEL COUNTY WEST VIRGINIA...INCLUDING THE PITTSBURGH METRO AREA. EXPECT BRIEF HEAVY RAIN...WIND GUSTS TO 30 MPH...AND OCCASIONAL LIGHTNING STRIKES.
Special weather statement, Jul 23, 11:59 AM EDT, 1 hour 14 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 1159 AM EDT WED JUL 23 2008 PAZ014-015-021-022-029>032-WVZ003-004-012-231700- BUTLER-CLARION-ALLEGHENY-ARMSTRONG-WASHINGTON-WESTMORELAND-GREENE- FAYETTE-OHIO-MARSHALL-WETZEL- INCLUDING THE CITIES OF...BUTLER...ZELIENOPLE...CLARION... PITTSBURGH METRO AREA...KITTANNING...FORD CITY...LEECHBURG... FREEPORT...APOLLO...WASHINGTON...CANONSBURG...DONORA... CALIFORNIA...CHARLEROI...MONONGAHELA...MCMURRAY...GREENSBURG... NEW KENSINGTON...JEANNETTE...LATROBE...MONESSEN...WAYNESBURG... FAIRDALE...UNIONTOWN...CONNELLSVILLE...OHIOPYLE...WHEELING... MOUNDSVILLE...NEW MARTINSVILLE 1159 AM EDT WED JUL 23 2008 A LINE OF SHOWERS AND THUNDERSTORMS WILL MOVE EAST AT 20 MPH EXTENDING FROM ARMSTRONG COUNTY PENNSYLVANIA SOUTH TO WETZEL COUNTY WEST VIRGINIA...INCLUDING THE PITTSBURGH METRO AREA. EXPECT BRIEF HEAVY RAIN...WIND GUSTS TO 40 MPH...AND PEA SIZED HAIL.
Special weather statement, Jul 23, 1:03 PM EDT, 10 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 103 PM EDT WED JUL 23 2008 PAZ015-016-021>023-029>032-WVZ012-022-231815- CLARION-JEFFERSON PA-ALLEGHENY-ARMSTRONG-INDIANA-WASHINGTON- WESTMORELAND-GREENE-FAYETTE-WETZEL-MONONGALIA- INCLUDING THE CITIES OF...CLARION...PUNXSUTAWNEY...BROOKVILLE... REYNOLDSVILLE...BROCKWAY...PITTSBURGH METRO AREA...KITTANNING... FORD CITY...LEECHBURG...FREEPORT...APOLLO...INDIANA... WASHINGTON...CANONSBURG...DONORA...CALIFORNIA...CHARLEROI... MONONGAHELA...MCMURRAY...GREENSBURG...NEW KENSINGTON... JEANNETTE...LATROBE...MONESSEN...WAYNESBURG...FAIRDALE... UNIONTOWN...CONNELLSVILLE...OHIOPYLE...NEW MARTINSVILLE... MORGANTOWN 103 PM EDT WED JUL 23 2008 A LINE OF SHOWERS AND THUNDERSTORMS WILL MOVE EAST AT 20 MPH EXTENDING FROM JEFFERSON COUNTY PENNSYLVANIA SOUTH TO WETZEL COUNTY WEST VIRGINIA. THE STRONGER STORMS ARE CAPABLE OF PRODUCING WIND GUSTS TO 40 MPH AND DIME SIZED HAIL. RAINFALL OF ONE HALF TO ONE INCH IS LIKELY WITH THESE STORMS...PRODUCING SIGNIFICANT PONDING OF WATER ON ROADWAYS.
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 8:04 PM EDT | Tornado Warning | PBZ | Beaver, Lawrence | 41 min |
| Jul 22, 8:27 PM EDT | Tornado Warning | PBZ | Beaver, Butler, Lawrence | 48 min |
| Jul 23, 1:42 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana, Westmoreland | 63 min |
| Jul 23, 2:00 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana, Jefferson | 60 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2008Every flash flood warning in 2008
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.