Alert archive / Pennsylvania / Flash Flood Warnings in 1991
Flash Flood Warning 21, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Dec 3, 1991, 1:26 AM EST for Cambria County, Westmoreland County, Pennsylvania. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Dec 3, 1991, 1:26 AM EST (06:26 UTC)
- Expired
- Dec 3, 1991, 4:30 AM EST
- In force
- 3 hr
- Issued by
- NWS Pittsburgh, PA
- Area
- Whole counties
Counties Cambria County, PA, Westmoreland County, PA
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 00:00Z, 6.4 hours before the alert went out and 85 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
- 2 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 500 m above ground
- 0-6 km bulk shear
- 93 kt
- 0-1 km storm-relative helicity
- 414 m²/s²
- 0-3 km storm-relative helicity
- 784 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 030626 FFWPIT PAC021-051-129-030930- FLOOD WARNING NATIONAL WEATHER SERVICE PITTSBURGH PA 126 AM EST TUE DEC 3 1991 THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A FLOOD WARNING EFFECTIVE UNTIL 430 AM EST FOR THE FOLLOWING LOCATIONS... IN WEST PENNSYLVANIA ...CAMBRIA COUNTY...FAYETTE COUNTY...WESTMORELAND COUNTY RAINS IN EXCESS OF 2 INCHES SINCE EARLY MONDAY EVENING HAVE CAUSED POOR DRAINAGE FLOODING. CONTINUED HEAVY RAIN EARLY THIS TUESDAY MORNING WILL CAUSE SOME SMALL STREAMS AND CREEKS TO FLOOD ALSO. A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.
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, Dec 2, 10:31 PM EST, 2 hours 55 minutes before
PAZ004-030900- SPECIAL WEATHER STATEMENT...WINTER STORM WARNING... NATIONAL WEATHER SERVICE PITTSBURGH PA 1030 PM EST MON DEC 2 1991 ...WINTER STORM WARNING TONIGHT FOR THE NORTHERN MOUNTAINS OF WESTERN PENNSYLVANIA... A WINTER STORM WARNING HAS BEEN ISSUED FOR THE NORTHERN MOUNTAINS OF WESTERN PENNSYLVANIA FOR DAMAGING ACCUMULATIONS OF ICE. REPORTS OF DOWNED TREES AND POWERLINES HAVE BEEN RECEIVED FROM MCKEAN AND ELK COUNTIES IN THE WARNED AREA. TRAVELING THROUGH THE NORTHERN MOUNTAINS IS NOT ADVISABLE EVEN AFTER AFTER THE FREEZING RAIN CHANGES TO ALL RAIN. RAIN WILL COVER THE ICE MAKING IT DIFFICULT TO SEE THE SLICK SPOTS. BRIDGES AND OVERPASSES WILL BE ESPECIALLY DANGEROUS. POWER OUTAGES FROM DOWNED TREES AND LINES CAN ALSO BE EXPECTED. FREEZING RAIN WILL CHANGE OVER TO ALL RAIN IN THE EARLY MORNING HOURS BUT ICY CONDITIONS WILL PERSIST UNTIL THE RAIN WASHES AWAY THE ACCUMULATING ICE. A FLOOD WATCH FOR STREAMS AND CREEKS IS ALSO IN EFFECT OVERNIGHT FOR MUCH OF WESTERN PENNSYLVANIA AS WELL AS THE NORTHERN PANHANDLE OF WEST VIRGINIA. WJD/RWH
Special weather statement, Dec 3, 1:07 AM EST, 19 minutes before
PAZ001>006-013>015-WVZ001-030800- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY... NATIONAL WEATHER SERVICE PITTSBURGH PA 100 AM EST TUE DEC 3 1991 ...FLOOD WARNINGS FOR GREENE AND WASHINGTON COUNTIES UNTIL 430 AM... ...FLOOD WARNING FOR MARSHAL COUNTY OF WEST VIRGINIA UNTIL 400 AM... ...FLOOD WATCH FOR STREAMS AND CREEKS TONIGHT FOR SOUTHWEST...SOUTH CENTRAL...AND THE LAUREL MOUNTAINS OF PENNSYLVANIA AS WELL AS THE NORTHERN PANHANDLE OF WEST VIRGINIA... ...WINTER WEATHER ADVISORIES FOR FREEZING RAIN IN NORTHWEST PENNSYLVANIA NORTH OF INTERSTATE 80... AT 1255 AM WEATHER RADAR SHOWED RAIN OVER WESTERN AND CENTRAL PENNSYLVANIA...CENTRAL AND EASTERN OHIO...AND NORTHERN WEST VIRGINIA. IN THE BRADFORD...WARREN...AND DUBOIS AREAS FREEZING RAIN AND SLEET WAS FALLING. THE AREA OF PRECIPITATION EXTENDED FROM ERIE PENNSYLVANIA...SOUTH TO CLARKSBURG WEST VIRGINIA...AND FROM COLUMBUS OHIO...EAST TO STATE COLLEGE PENNSYLVANIA. HEAVIER RAIN CONTINUED TO MOVE OVER MARSHALL COUNTY IN THE NORTHERN PANHANDLE OF WEST VIRGINIA...AND GREENE AND WASHINGTON COUNTIES OF SOUTHWEST PENNSYLVANIA. HERE...HEAVY RAINS HAVE SATURATED THE GROUND AND POOR DRAINAGE FLOODING HAS BEGUN. CREEKS WERE AT BANKFULL IN MARSHALL COUNTY. IN NORTHWEST PENNSYLVANIA...ICE IS ACCUMULATING. TREES AND POWER LINES WERE REPORTED DOWN IN MCKEAN AND ELK COUNTIES. OVER THE PAST HOUR...COVERAGE OF THE PRECIPITATION REMAINED WIDESPREAD AND INTENSITIES STAYED THE SAME. MOVEMENT WAS TOWARD THE NORTHEAST AT 45 MPH. REHAK
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 3, 12:28 AM EST | Flash Flood Warning | PBZ | Greene, Washington | 4 hr |
| Dec 3, 1:26 AM EST | Flash Flood Warning | PBZ | Fayette | 3 hr |
| Dec 3, 7:46 AM EST | Flash Flood Warning | PBZ | Greene, Washington | 2 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 1991Every flash flood warning in 1991
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.