Alert archive / Pennsylvania / Flash Flood Warnings in 1990

Flash Flood Warning 21, NWS Pittsburgh, PA

June 30, 1990Clearfield County, Pennsylvania

NWS Pittsburgh, PA issued this flash flood warning at Jun 30, 1990, 7:56 PM EDT for Clearfield 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

County Clearfield 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 152 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

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

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KPIT 302359
FFWPIT
PAC005-019-031-033-051-065-125-129-010100-
 
BULLETIN - EBS ACTIVATION REQUESTED
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
756 PM EDT SAT JUN 30 1990
 
THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  900 PM EDT
AND A FLASH FLOOD WARNING EFFECTIVE UNTIL  900 PM EDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN WEST PENNSYLVANIA
          ...ARMSTRONG...BUTLER...CLARION...CLEARFIELD...FAYETTE
          ...JEFFERSON...WASHINGTON...WESTMORELAND
 
RADAR STILL SHOWED NUMEROUS SEVERE THUNDERSTORMS OVER THE WARNED AREA
WITH DAMAGING WIND...LARGE HAIL...DEADLY LIGHTNING. A TORNADO MAY EVEN
OCCUR WITH THESE STORMS. ALSO DOWNPOURS HEAVY ENOUGH TO CAUSE
FLOODING...ESPECIALLY IN AREAS HARDHIT FROM PREVIOUS STORMS THIS EVENING 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

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	Clarion, Jefferson	64 min

Nearby

Flash Flood Warnings in Pennsylvania, 1990 Every 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.