Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 29, NWS Pittsburgh, PA

June 9, 1990Washington County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jun 9, 1990, 6:00 AM EDT for Washington County, Pennsylvania. It was in force for 60 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 9, 1990, 6:00 AM EDT (10:00 UTC)
Expired: Jun 9, 1990, 7:00 AM EDT
In force: 60 min
Issued by: NWS Pittsburgh, PA
Area: Whole counties

County Washington County, PA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

Time	Report	Where	Remark
Jun 9, 6:15 AM EDT	Hail 0.75	Washington, PA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 00:00Z, 10.0 hours before the alert went out and 28 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: 1817 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 1091 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 192 m²/s²
0-3 km storm-relative helicity: 233 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 10.6

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, Jun 9, 12:49 AM EDT, 5 hours 11 minutes before

PAZ001>006-013>015-WVZ001-090900-

SPECIAL WEATHER AND FLOOD STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
1245 AM EDT SAT JUN 9 1990

...FLASH FLOOD WARNING AND SEVERE THUNDERSTORM WARNING TIL 130 AM FOR
CLEARFIELD INDIANA BUTLER ARMSTRONG AND ALLEGHENY COUNTIES...

...TORNADO WATCH TIL 3 AM FOR THE WEST VIRGINIA NORTHERN PANHANDLE AND
FOR WESTERN PENNSYLVANIA SOUTH OF PITTSBURGH AND ALTOONA...

...FLOOD WATCH FOR THE WEST VIRGINIA PANHANDLE AND ALL OF WESTERN
PENNSYLVANIA TIL 4 AM...

JUST BEFORE 1 AM...THE WORST STORMS WERE OVER INDIANA CLEARFIELD AND
CENTRE COUNTIES IN THE CENTRAL PENNSYLVANIA MOUNTAINS.  REPEATED HEAVY
RAIN MAY CAUSE THE RAPID FLOODING OF STREAMS AND CREEKS AND WHERE
DRAINAGE IS POOR.  THERE WERE ALSO THUNDERSTORMS WITH HEAVY RAIN OVER
THE WEST VIRGINIA NORTHERN PANHANDLE AND THE SOUTHWEST PENNSYLVANIA
COUNTIES OF GREENE AND WASHINGTON.  THESE TOO CAN CAUSE FLOODING.

THE RAIN HAS LESSENED OVER ALLEGHENY ARMSTRONG AND BUTLER
COUNTIES...BUT RUNOFF FROM THE PREVIOUS HEAVY RAIN CAN STILL CAUSE
FLOODING TIL AROUND 130.  IN GENERAL THE THREAT OF HIGH WINDS AND LARGE
HAIL HAS DIMINISHED...BUT THERES STILL LOTS OF DANGEROUS LIGHTNING WITH
THESE STORMS WHICH HAS CAUSED FIRES AND MANY OF THE POWER OUTAGES.

GIORDANO/SISK/ALESSI/PALKO/LEONARDON/REHAK

Special weather statement, Jun 9, 1:55 AM EDT, 4 hours 5 minutes before

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Special weather statement, Jun 9, 1:56 AM EDT, 4 hours 4 minutes before

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Special weather statement, Jun 9, 2:39 AM EDT, 3 hours 21 minutes before

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<head>
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</head>
<body>
  <main class="wrap">
    <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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Special weather statement, Jun 9, 3:02 AM EDT, 2 hours 58 minutes before

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  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <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.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 8, 8:29 PM EDT	Tornado Warning	PBZ	Somerset	61 min
Jun 8, 9:29 PM EDT	Tornado Warning	PBZ	Bedford	61 min
Jun 8, 11:21 PM EDT	Flash Flood Warning	PBZ	Allegheny, Armstrong, Butler	2 hr
Jun 8, 11:21 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Butler	2 hr
Jun 9, 12:10 AM EDT	Flash Flood Warning	PBZ	Clearfield, Indiana	80 min
Jun 9, 12:10 AM EDT	Severe Thunderstorm Warning	PBZ	Clearfield, Indiana	80 min
Jun 9, 1:16 AM EDT	Flash Flood Warning	PBZ	Clearfield	2 hr
Jun 9, 6:15 AM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler	60 min
Jun 9, 6:26 AM EDT	Severe Thunderstorm Warning	PBZ	Westmoreland	64 min
Jun 9, 7:51 AM EDT	Severe Thunderstorm Warning	PBZ	Cambria, Somerset	39 min
Jun 9, 5:39 AM EDT	Severe Thunderstorm Warning	PBZ	Marshall, Ohio	36 min
Jun 9, 5:56 AM EDT	Severe Thunderstorm Warning	PBZ	Brooke, Hancock	34 min

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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.