Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 21, NWS Pittsburgh, PA

July 18, 1986Clearfield County, Jefferson County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jul 18, 1986, 11:23 PM EDT for Clearfield County, Jefferson County, Pennsylvania. It was in force for 57 min.

The area

The counties it named.

The facts

Issued
Jul 18, 1986, 11:23 PM EDT (03:23 UTC)
Expired
Jul 19, 1986, 12:20 AM EDT
In force
57 min
Issued by
NWS Pittsburgh, PA
Area
Whole counties

Counties Clearfield 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 00:00Z, 3.4 hours before the alert went out and 136 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 1986-07-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1388 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 1986-07-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 square meters per square second.193958Sfc1 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
1388 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
1267 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
90 m²/s²
0-3 km storm-relative helicity
139 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KPIT 190323
SVRPIT
PAC033-065-190420-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
1123 PM EDT FRI JUL 18 1986
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 1220 AM EDT FOR THE FOLLOWING COUNTIES OF
 
PENNSYLVANIA.. CLEARFIELD.. JEFFERSON
 
                                                                        
THESE THUNDERSTORMS WILL BE ACCOMPAINIED BY DAMAGING WINDS LARGE HAIL   
DANGEROUS LIGHTNING AND POSSIBLY ENOUGH RAIN TO CAUSE FLOODING.         
                                                                        
                                                                       
                                                                        
                                                                        
IF THREATENING WEATHER APPROACHES GO TO A PLACE OF SAFETY IMMEDIATELY.  
 
BC/RSD

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 19, 12:45 AM EDTSevere Thunderstorm WarningPBZCambria60 min
Jul 19, 2:05 PM EDTSevere Thunderstorm WarningPBZSomerset, Westmoreland55 min
Jul 19, 2:05 PM EDTSevere Thunderstorm WarningPBZArmstrong, Indiana55 min
Jul 19, 3:00 PM EDTSevere Thunderstorm WarningPBZFayette, Somerset60 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1986Every severe thunderstorm warning in 1986

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.