Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1995

Severe Thunderstorm Warning 113, NWS Pittsburgh, PA

June 21, 1995Armstrong County, Butler County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jun 21, 1995, 5:13 PM EDT for Armstrong County, Butler County, Pennsylvania. It was in force for 77 min.

The area

The counties it named.

The facts

Issued
Jun 21, 1995, 5:13 PM EDT (21:13 UTC)
Expired
Jun 21, 1995, 6:30 PM EDT
In force
77 min
Issued by
NWS Pittsburgh, PA
Area
Whole counties

Counties Armstrong County, PA, Butler County, PA

The radar

The Pittsburgh radar (KPBZ), 58 km from the middle of the area, began a volume at 21:15 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 12:00Z, 9.2 hours before the alert went out and 61 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 12:00Z on 1995-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3253 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 12:00Z on 1995-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -6 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
3253 J/kg
Mixed-layer CIN
-27 J/kg
Mixed-layer LCL
696 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-6 m²/s²
0-3 km storm-relative helicity
64 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 212117 RRA
SVRPIT
PAC005-019-212230-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
513 PM EDT WED JUN 21 1995
 
THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  630 PM EDT
FOR THE FOLLOWING LOCATIONS...
 
IN WEST PENNSYLVANIA
 
   ...ARMSTRONG COUNTY...BUTLER COUNTY
 
RADAR SHOWED SEVERE THUNDERSTORMS OVER NORTHERN ARMSTRONG COUNTY.
AND ALSO ENTERING NORTHEASTERN BUTLER COUNTY.
THESE STORMS ARE MOVING SOUTHWEST AROUND 10 MPH.
 
EXPECT DAMAGING WINDS...LARGE HAIL...DANGEROUS LIGHTNING AND TORRENTIAL
DOWNPOURS.  THE RAIN CAN BE HEAVY ENOUGH TO CAUSE FLASH FLOODING.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND OVER 55 MPH...DESTRUCTIVE
HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION
MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR BUILDING.  HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD. SEVERE THUNDERSTORMS CAN AND DO PRODUCE TORNADOES WITH
LITTLE OR NO ADVANCE WARNING.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 21, 12:54 AM EDTSevere Thunderstorm WarningPBZWashington66 min
Jun 21, 2:37 PM EDTSevere Thunderstorm WarningPBZWestmoreland68 min
Jun 21, 3:28 PM EDTSevere Thunderstorm WarningPBZIndiana, Westmoreland62 min
Jun 21, 3:38 PM EDTSevere Thunderstorm WarningPBZAllegheny, Armstrong, Jefferson67 min
Jun 21, 3:38 PM EDTSevere Thunderstorm WarningPBZMercer67 min
Jun 21, 3:38 PM EDTSevere Thunderstorm WarningPBZForest67 min
Jun 21, 4:12 PM EDTSevere Thunderstorm WarningPBZClarion63 min
Jun 21, 4:36 PM EDTFlash Flood WarningPBZMercer114 min
Jun 21, 4:36 PM EDTSevere Thunderstorm WarningPBZMercer114 min
Jun 21, 4:40 PM EDTSevere Thunderstorm WarningPBZBeaver, Washington80 min
Jun 21, 4:40 PM EDTSevere Thunderstorm WarningPBZClarion, Jefferson80 min
Jun 21, 4:40 PM EDTSevere Thunderstorm WarningPBZAllegheny55 min
Jun 21, 4:50 PM EDTSevere Thunderstorm WarningPBZVenango70 min
Jun 21, 5:33 PM EDTFlash Flood WarningPBZClarion, Venango57 min
Jun 21, 5:33 PM EDTSevere Thunderstorm WarningPBZClarion, Venango57 min
Jun 21, 6:04 PM EDTSevere Thunderstorm WarningPBZLawrence26 min
Jun 21, 6:30 PM EDTSevere Thunderstorm WarningPBZForest, Jefferson45 min
Jun 21, 7:31 PM EDTSevere Thunderstorm WarningPBZWashington44 min
Jun 21, 7:40 PM EDTSevere Thunderstorm WarningPBZArmstrong50 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1995Every severe thunderstorm 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.