Alert archive / Pennsylvania / Flash Flood Warnings in 1999
Flash Flood Warning 39, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Apr 9, 1999, 2:58 PM EDT for Fayette County, Greene 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
- Apr 9, 1999, 2:58 PM EDT (18:58 UTC)
- Expired
- Apr 9, 1999, 6:00 PM EDT
- In force
- 3 hr
- Issued by
- NWS Pittsburgh, PA
- Area
- Whole counties
Counties Fayette County, PA, Greene County, PA
The radar
The Pittsburgh radar (KPBZ), 76 km from the middle of the area, began a volume at 19:01 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, 7.0 hours before the alert went out and 241 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2194 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 307 m²/s²
- 0-3 km storm-relative helicity
- 614 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPIT 091858 FFWPIT PAC051-059-092200- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE PITTSBURGH PA 258 PM EDT FRI APR 9 1999 THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A * FLASH FLOOD WARNING FOR... FAYETTE COUNTY IN SOUTHWESTERN PENNSYLVANIA. GREENE COUNTY IN SOUTHWESTERN PENNSYLVANIA. * UNTIL 600 PM EDT. * AT 256 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN AREA OF VERY HEAVY RAIN JUST ENTERING THE WARNING AREA FROM THE SOUTHWEST...MOVING EAST NORTHEAST AT 40 MPH. * THUNDERSTORMS WITH HEAVY RAIN ARE MOVING INTO THE WARNING AREA DURING THE NEXT HOUR. HEAVY RAINS THIS MORNING ALREADY SATURATED THE SOIL. FLOODING CAN BEGIN AFTER JU ST HALF AN INCH OF RAIN IN AN HOUR. <<CALL TO ACTION>>MOVE TO HIGHER GROUND IF FLOOD WATERS THREATEN. .END/
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.
In the hours before
Special weather statement, Apr 9, 11:55 AM EDT, 3 hours 3 minutes before
MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029>032-WVZ001>004-012-021>023-041-092000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 1155 AM EDT FRI APR 9 1999 ...SEVERE THUNDERSTORMS POSSIBLE THIS AFTERNOON AND EVENING... THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS ACROSS EAST CENTRAL OHIO...NORTHERN WEST VIRGINIA...SOUTHWESTERN PENNSYLVANIA...AND GARRETT COUNTY MARYLAND. AN UPPER LEVEL DISTURBANCE AND ASSOCIATED SURFACE LOW WILL BE APPROACHING THE REGION FROM THE WEST THIS AFTERNOON. THE ATMOSPHERE WILL REMAIN QUITE UNSTABLE AHEAD OF THIS DISTURBANCE AND THUNDERSTORMS ARE EXPECTED TO REDEVELOP ACROSS THE REGION THIS AFTERNOON. IT APPEARS THAT DAMAGING STRAIGHT-LINE WINDS AND LARGE HAIL WILL BE THE MAIN SEVERE WEATHER THREAT THIS AFTERNOON. THE THUNDERSTORMS WILL MOVE INTO EAST CENTRAL OHIO AS EARLY AS 100 TO 200 PM AND INTO WESTERN PENNSYLVANIA AND NORTHERN WEST VIRGINIA BY 300 TO 400 PM. IN ADDITION...HEAVY DOWNPOURS ASSOCIATED WITH THESE STORMS MAY PRODUCE LOCALIZED FLOODING PROBLEMS...ESPECIALLY WHERE SEVERAL STORMS PASS OVER THE SAME LOCATION. ISOLATED RAINFALL AMOUNTS OF OVER ONE INCH ARE POSSIBLE. AS A RESULT...SKYWARN AND HAM RADIO NETWORK ACTIVATION MAY BE NEEDED THIS AFTERNOON. STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA SOURCES FOR FURTHER UPDATES ON THIS SEVERE WEATHER POTENTIAL. WJD/RWH
Special weather statement, Apr 9, 11:55 AM EDT, 3 hours 3 minutes before
MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029>032-WVZ001>004-012-021>023-041-092000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 1155 AM EDT FRI APR 9 1999 ...SEVERE THUNDERSTORMS POSSIBLE THIS AFTERNOON AND EVENING... THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS ACROSS EAST CENTRAL OHIO...NORTHERN WEST VIRGINIA...SOUTHWESTERN PENNSYLVANIA...AND GARRETT COUNTY MARYLAND. AN UPPER LEVEL DISTURBANCE AND ASSOCIATED SURFACE LOW WILL BE APPROACHING THE REGION FROM THE WEST THIS AFTERNOON. THE ATMOSPHERE WILL REMAIN QUITE UNSTABLE AHEAD OF THIS DISTURBANCE AND THUNDERSTORMS ARE EXPECTED TO REDEVELOP ACROSS THE REGION THIS AFTERNOON. IT APPEARS THAT DAMAGING STRAIGHT-LINE WINDS AND LARGE HAIL WILL BE THE MAIN SEVERE WEATHER THREAT THIS AFTERNOON. THE THUNDERSTORMS WILL MOVE INTO EAST CENTRAL OHIO AS EARLY AS 100 TO 200 PM AND INTO WESTERN PENNSYLVANIA AND NORTHERN WEST VIRGINIA BY 300 TO 400 PM. IN ADDITION...HEAVY DOWNPOURS ASSOCIATED WITH THESE STORMS MAY PRODUCE LOCALIZED FLOODING PROBLEMS...ESPECIALLY WHERE SEVERAL STORMS PASS OVER THE SAME LOCATION. ISOLATED RAINFALL AMOUNTS OF OVER ONE INCH ARE POSSIBLE. AS A RESULT...SKYWARN AND HAM RADIO NETWORK ACTIVATION MAY BE NEEDED THIS AFTERNOON. STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA SOURCES FOR FURTHER UPDATES ON THIS SEVERE WEATHER POTENTIAL. WJD/RWH
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 2:33 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 58 min |
| Apr 9, 2:44 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 59 min |
| Apr 9, 2:52 PM EDT | Flash Flood Warning | PBZ | Allegheny, Washington | 3 hr |
| Apr 9, 2:54 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 60 min |
| Apr 9, 3:11 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Westmoreland | 79 min |
| Apr 9, 3:39 PM EDT | Tornado Warning | PBZ | Westmoreland | 51 min |
| Apr 9, 4:06 PM EDT | Flash Flood Warning | PBZ | Beaver | 2 hr |
| Apr 9, 4:19 PM EDT | Flash Flood Warning | PBZ | Westmoreland | 3 hr |
| Apr 9, 4:23 PM EDT | Flash Flood Warning | PBZ | Butler | 3 hr |
| Apr 9, 5:51 PM EDT | Flash Flood Warning | PBZ | Washington, Westmoreland | 4 hr |
| Apr 9, 6:59 PM EDT | Flash Flood Warning | PBZ | Fayette | 3 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 1999Every flash flood warning in 1999
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.