Alert archive / Pennsylvania / Flash Flood Warnings in 1995

Flash Flood Warning 99, NWS Pittsburgh, PA

August 2, 1995Allegheny County, Pennsylvania

NWS Pittsburgh, PA issued this flash flood warning at Aug 2, 1995, 8:07 PM EDT for Allegheny County, Pennsylvania. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Aug 2, 1995, 8:07 PM EDT (00:07 UTC)
Expired
Aug 2, 1995, 10:15 PM EDT
In force
2 hr
Issued by
NWS Pittsburgh, PA
Area
Whole counties

County Allegheny County, PA

The radar

The Pittsburgh radar (KPBZ), 21 km from the middle of the area, began a volume at 00:10 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

Pittsburgh, PA (KPIT), launched 00:00Z, 0.1 hours before the alert went out and 12 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-pSkew-T log-p diagram, Pittsburgh, PA at 00:00Z on 1995-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1761 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Pittsburgh, PA at 00:00Z on 1995-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1761 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
1217 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
85 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 030010
FFWPIT
PAC003-030215-
 
BULLETIN - EBS ACTIVATION REQUESTED
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
807 PM EDT WED AUG 2 1995
 
THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
EFFECTIVE UNTIL 1015 PM EDT
FOR THE FOLLOWING LOCATION...
 
IN WEST PENNSYLVANIA
 
   ...ALLEGHENY COUNTY
 
WEATHER RADAR SHOWED A NEARLY STATIONARY THUNDERSTORM OVER THE CITY OF
PITTSBURGH. TORRENTIAL RAINS WILL CONTINUE AND FLASH FLOODING IS LIKELY.
IN ADDITION...HAIL...STRONG GUSTY WINDS AND DANGEROUS LIGHTNING IS
LIKELY WITH THESE STORMS.
 
NEVER DRIVE INTO A FLOODED AREA.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND...DESTRUCTIVE HAIL...
DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR SAFETY GO TO AN INTERIOR
ROOM ON THE LOWEST FLOOR OF YOUR BUILDING. SEVERE THUNDERSTORMS CAN
PRODUCE TORNADOES WITH LITTLE ADVANCE WARNING. HEAVY RAINS CAN
QUICKLY CAUSE FLOODING. DO NOTT CROSS WHERE WATER COVERS YOUR PATH.

The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 2, 8:07 PM EDTSevere Thunderstorm WarningPBZAllegheny2 hr
Aug 2, 8:47 PM EDTSevere Thunderstorm WarningPBZButler58 min
Aug 2, 9:46 PM EDTSevere Thunderstorm WarningPBZButler59 min

Nearby

Flash Flood Warnings in Pennsylvania, 1995Every flash flood warning in 1995

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.