Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 12, NWS Pittsburgh, PA

May 15, 1990Clarion County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at May 15, 1990, 6:02 PM EDT for Clarion County, Pennsylvania. It was in force for 58 min.

The area

The counties it named.

The facts

Issued: May 15, 1990, 6:02 PM EDT (22:02 UTC)
Expired: May 15, 1990, 7:00 PM EDT
In force: 58 min
Issued by: NWS Pittsburgh, PA
Area: Whole counties

County Clarion 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 104 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: 61 J/kg
Mixed-layer CIN: -163 J/kg
Mixed-layer LCL: 1172 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 177 m²/s²
0-3 km storm-relative helicity: 195 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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, May 15, 3:49 PM EDT, 2 hours 13 minutes before

PAZ001>006-013>015-WVZ001-160300-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE PITTSBURGH PA
345 PM EDT SUN MAY 13 1990

...THUNDERSTORMS WITH HEAVY DOWNPOURS HAIL GUSTY WIND AND DANGEROUS
LIGHTNING DEVELOPING OVER WESTERN PENNSYLVANIA LATE THIS AFTERNOON AND
TONIGHT...

JUST BEFORE 4 PM PITTSBURGH WEATHER RADAR SHOWED THUNDERSTORMS IN
WESTERN PENNSYLVANIA ALONG A LINE FROM LAWRENCE COUNTY EASTWARD THROUGH
BUTLER AND ARMSTRONG COUNTIES TO CLEARFIELD AND CENTRE COUNTIES.  SOME
AREAS IN THESE COUNTIES MAY GET REPEATED HEAVY DOWNPOURS THROUGH 6 PM
WHICH MAY RESULT IN ROADWAY AND OTHER POOR DRAINAGE TYPE FLOODING.  SO
USE EXTRA CAUTION.  STRONG WIND GUSTS AND DANGEROUS LIGHTNING ARE ALSO
POSSIBLE.  WHEN A THUNDERSTORM APPROACHES...ITS SAFEST TO GO INSIDE.

OTHER THUNDERSTORMS WILL BE DEVELOPING ACROSS WESTERN PENNSYLVANIA AND
THE NORTHERN WEST VIRGINIA PANHANDLE THIS EVENING AND TONIGHT.  SO BE
ON THE LOOKOUT FOeR THUNDERSTORMS AND LISTEN FOR FURTHER ADVISORIES.

GIORDANO/STAIRS/REHAK

Special weather statement, May 15, 5:06 PM EDT, 56 minutes before

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Special weather statement, May 15, 5:45 PM EDT, 17 minutes before

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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
        Please try again in a few minutes.
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The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 3:58 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong	62 min
May 15, 4:53 PM EDT	Flash Flood Warning	PBZ	Armstrong, Butler	3 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1990 Every severe thunderstorm 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.