Alert archive / Pennsylvania / Flash Flood Warnings in 1990
Flash Flood Warning 20, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Jun 30, 1990, 7:56 PM EDT for Clarion County, Jefferson County, Pennsylvania. It was in force for 64 min.
The area
The counties it named.
The facts
- Issued
- Jun 30, 1990, 7:56 PM EDT (23:56 UTC)
- Expired
- Jun 30, 1990, 9:00 PM EDT
- In force
- 64 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Whole counties
Counties Clarion County, PA, Jefferson County, PA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 12:00Z, 11.9 hours before the alert went out and 112 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
- NaN m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 87 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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, Jun 30, 4:42 PM EDT, 3 hours 14 minutes before
PAZ001>006-013>015-WVZ001-302200- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE PITTSBURGH PA 445 PM EDT SAT JUN 30 1990 ...SEVERE THUNDERSTORM WATCH FOR THE NORTHERN WEST VIRGINIA PANHANDLE AND MOST OF WESTERN PENNSYLVANIA TIL 10 PM... JUST BEFORE 4 PM...RADAR SHOWED A THUNDERSTORM WITH STRONG WIND... DANGEROUS LIGHTNING AND HEAVY DOWNPOURS MOVING INTO LAWRENCE BEAVER SOUTHERN BUTLER AND WESTERN ALLEGHENY COUNTIES. MOVEMENT WAS TO THE SOUTHEAST AT 40 MILES AN HOUR. THERE WERE OTHER STRONG STORMS OVER WESTMORELAND COUNTY MOVING INTO THE JOHNSTOWN AREA AND ANOTHER OVER BLAIR COUNTY MOVING INTO NORTHERN BEDFORD AND HUNTINGDON COUNTIES. IF A STRONG STORM APPROACHES...TAKE COVER INDOORS AND AWAY FROM GLASS. REMEMBER ALSO HEAVY DOWNPOURS CAN CAUSE FLOODING. A WATCH OR WARNING IS ISSUED. THERE IS SOME LIGHT AT THE END OF THE TUNNEL IN THE FORM OF A COLD FRONT MOVING IN FROM THE UPPER MIDWEST. IT IS EXPECTEHD TO CROSS WESTERN PENNSYLVANIA LATER TONIGHT FINALLY BRINGING A BREAK IN THE HEAT AND HUMIDITY FOR SUNDAY. RWH
Local storm report, Jun 30, 7:51 PM EDT, 5 minutes before
STORM REPORT NATIONAL WEATHER SERVICE PITTSBURGH, PA 749 PM EDT SAT JUN 30 1990 PRELIMINARY STORM REPORT WSFO PIT 6/30/90 TIME EVENT LOCATION 1648 G60KTS BVI (BEAVER CNTY ARPT) 1710 POWER LINES DOWN BADEN (BEAVER CNTY) 1738 11/2A ALIQUIPPA (BEAVER CNTY) 1740 11/4A ALIQUIPPA (BEAVER CNTY) 1740 13/4A WSFO PIT (ALLEGHENY CNTY) 1750 POWER LINES DOWN MONACA (BEAVER CNTY) 1755 11/2A CORAOPOLIS (ALLEGHENY CNTY) 1800 3/4A 8 MILES NW BUTLER (BUTLER CNTY) 1809 1A CARNEGIE (ALLEGHENY CNTY) 1844 1A IMPERIAL (ALLEGHENY CNTY) 1917 3/4A PERRYOPOLIS (FAYETTE) 1930 1A OAKMONT (ALLEGHENY)
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 4:49 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver | 56 min |
| Jun 30, 5:26 PM EDT | Severe Thunderstorm Warning | PBZ | Somerset, Westmoreland | 64 min |
| Jun 30, 5:26 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 64 min |
| Jun 30, 5:40 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong | 50 min |
| Jun 30, 6:20 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Indiana, Westmoreland | 55 min |
| Jun 30, 6:20 PM EDT | Severe Thunderstorm Warning | PBZ | Bedford, Cambria, Somerset | 55 min |
| Jun 30, 6:40 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Washington | 65 min |
| Jun 30, 7:03 PM EDT | Severe Thunderstorm Warning | PBZ | Clearfield | 57 min |
| Jun 30, 7:19 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Westmoreland | 41 min |
| Jun 30, 7:19 PM EDT | Severe Thunderstorm Warning | PBZ | Bedford, Cambria | 41 min |
| Jun 30, 7:56 PM EDT | Flash Flood Warning | PBZ | Armstrong, Butler, Fayette, Washington, Westmoreland | 64 min |
| Jun 30, 7:56 PM EDT | Flash Flood Warning | PBZ | Clearfield | 64 min |
Nearby
Flash Flood Warnings in Pennsylvania, 1990Every flash flood warning in 1990
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.