Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 27, NWS Pittsburgh, PA

May 13, 20184 counties in Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at May 13, 2018, 8:04 AM EDT for 4 counties in Pennsylvania. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 13, 2018, 8:04 AM EDT (12:04 UTC)
Expired: May 13, 2018, 8:45 AM EDT
In force: 41 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Allegheny County, PA, Beaver County, PA, Butler County, PA, Lawrence County, PA

The radar

The Pittsburgh radar (KPBZ), 27 km from the middle of the area, began a volume at 12:05 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 (KAGC), launched 12:00Z, 0.1 hours before the alert went out and 39 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: 28 J/kg
Mixed-layer CIN: -201 J/kg
Mixed-layer LCL: 485 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 267 m²/s²
0-3 km storm-relative helicity: 366 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

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.

NWS Pittsburgh, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at May 13, 7:32 AM EDT, 32 minutes earlier.

Area forecast discussion, May 13, 7:32 AM EDT, 32 minutes before

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Hazardous weather outlook, May 13, 3:31 AM EDT, 4 hours 33 minutes before

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<body>
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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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        Please try again in a few minutes.
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        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
May 12, 8:13 PM EDT	Flash Flood Warning	PBZ	Westmoreland	108 min
May 13, 8:39 AM EDT	Special Weather Statement	PBZ	Armstrong, Indiana	36 min
May 13, 4:22 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	38 min
May 13, 4:53 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene, Washington	52 min
May 13, 7:59 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	22 min
May 13, 6:17 PM EDT	Severe Thunderstorm Warning	PBZ	Guernsey, Monroe, Muskingum, Noble	43 min
May 13, 6:52 PM EDT	Severe Thunderstorm Warning	PBZ	Monroe	25 min
May 13, 6:54 PM EDT	Severe Thunderstorm Warning	PBZ	Belmont, Guernsey, Noble	36 min
May 13, 7:22 PM EDT	Severe Thunderstorm Warning	PBZ	Belmont, Guernsey, Noble	33 min
May 13, 4:05 PM EDT	Special Weather Statement	PBZ	Ohio	25 min
May 13, 7:52 PM EDT	Special Weather Statement	PBZ	Ohio	23 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2018 Every severe thunderstorm warning in 2018

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.