Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 67, NWS Pittsburgh, PA

September 30, 1986Beaver County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Sep 30, 1986, 5:58 PM EDT for Beaver County, Pennsylvania. It was in force for 42 min.

The area

The counties it named.

The facts

Issued
Sep 30, 1986, 5:58 PM EDT (21:58 UTC)
Expired
Sep 30, 1986, 6:40 PM EDT
In force
42 min
Issued by
NWS Pittsburgh, PA
Area
Whole counties

County Beaver 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, 10.0 hours before the alert went out and 37 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 1986-09-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 461 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 1986-09-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 212 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
461 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
871 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
212 m²/s²
0-3 km storm-relative helicity
199 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

Open this sounding in Storm Lab

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 severe thunderstorm 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, Sep 30, 5:35 PM EDT, 23 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH, PA
532 PM EDT TUE SEP 30 1986

...LINE OF STRONG THUNDERSTORMS MOVING TOWARD BUTLER AND BEAVER
     COUNTIES IN WESTERN PENNSYLVANIA...

A LINE OF STRONG THUNDERSTORMS MOVING OUT OF EAST CENTRAL WILL MOVE
ACROSS BUTLER AND BEAVER COUNTIES BETWEEN 545 PM AND 645 PM. SOME
OF THESE THUNDERSTORMS MAY BE ACCOMPANIED BY DAMAGING WINDS..HAIL AND
DANGEROUS LIGHTNING. THESE THUNDERSTORMS ARE MOVING EAST AT 45 MPH AND
BY 700 PM WILL PUSH EAST INTO ARMSTRONG..ALLEGHENY..AND WASHINGTON
COUNTIES.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 10 PM FOR MUCH OF
WESTERN PENNSYLVANIA.

STAY TUNED TO NOAA WEATHER RADIO FOR THE LATEST SEVE7RE WEATHER WARNINGS
AND WATCHES.

DAVIS

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 30, 5:46 PM EDTTornado WarningPBZButler64 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.