Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 133, NWS Pittsburgh, PA

June 30, 2013Armstrong County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jun 30, 2013, 1:26 PM EDT for Armstrong County, Pennsylvania. It was in force for 49 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
Jun 30, 2013, 1:26 PM EDT (17:26 UTC)
Expired
Jun 30, 2013, 2:15 PM EDT
In force
49 min
Issued by
NWS Pittsburgh, PA
Area
Storm-based polygon

County Armstrong County, PA

The radar

The Pittsburgh radar (KPBZ), 71 km from the middle of the area, began a volume at 17:27 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 5.4 hours before the alert went out and 272 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, Washington/Dulle, VA at 12:00Z on 2013-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 97 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, Washington/Dulle, VA at 12:00Z on 2013-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.1939587897Sfc1 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
97 J/kg
Mixed-layer CIN
-123 J/kg
Mixed-layer LCL
1167 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
74 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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 Jun 30, 12:27 PM EDT, 59 minutes earlier.

Area forecast discussion, Jun 30, 12:27 PM EDT, 59 minutes before
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Hazardous weather outlook, Jun 30, 11:55 AM EDT, 1 hour 31 minutes before
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In the hours before

Special weather statement, Jun 30, 12:32 PM EDT, 54 minutes before
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  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
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<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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      <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.

IssuedProductOfficeCountiesLasted
Jun 30, 12:32 PM EDTSpecial Weather StatementPBZButler28 min
Jun 30, 12:40 PM EDTSevere Thunderstorm WarningPBZArmstrong, Butler50 min
Jun 30, 1:46 PM EDTSpecial Weather StatementPBZBeaver29 min
Jun 30, 1:57 PM EDTSpecial Weather StatementPBZWashington33 min
Jun 30, 2:03 PM EDTSpecial Weather StatementPBZAllegheny27 min
Jun 30, 2:05 PM EDTSpecial Weather StatementPBZButler25 min
Jun 30, 2:21 PM EDTAreal Flood AdvisoryPBZButler3 hr
Jun 30, 2:24 PM EDTSpecial Weather StatementPBZJefferson51 min
Jun 30, 2:40 PM EDTSevere Thunderstorm WarningPBZJefferson50 min
Jun 30, 2:42 PM EDTAreal Flood AdvisoryPBZAllegheny3 hr
Jun 30, 3:00 PM EDTAreal Flood WarningPBZJefferson3 hr
Jun 30, 3:09 PM EDTSevere Thunderstorm WarningPBZAllegheny, Beaver, Washington51 min
Jun 30, 3:11 PM EDTAreal Flood AdvisoryPBZArmstrong, Clarion3 hr
Jun 30, 3:36 PM EDTFlash Flood WarningPBZAllegheny, Westmoreland54 min
Jun 30, 4:00 PM EDTSpecial Weather StatementPBZAllegheny30 min
Jun 30, 4:40 PM EDTSpecial Weather StatementPBZLawrence35 min
Jun 30, 5:14 PM EDTSpecial Weather StatementPBZLawrence16 min
Jun 30, 1:39 PM EDTSpecial Weather StatementPBZHarrison36 min
Jun 30, 2:14 PM EDTSpecial Weather StatementPBZJefferson31 min
Jun 30, 2:22 PM EDTSevere Thunderstorm WarningPBZCarroll, Harrison, Jefferson53 min
Jun 30, 2:57 PM EDTSpecial Weather StatementPBZMuskingum33 min
Jun 30, 3:03 PM EDTSevere Thunderstorm WarningPBZMuskingum42 min
Jun 30, 3:19 PM EDTAreal Flood AdvisoryPBZMuskingum3 hr
Jun 30, 4:32 PM EDTSpecial Weather StatementPBZGuernsey28 min
Jun 30, 5:08 PM EDTSpecial Weather StatementPBZGuernsey37 min
Jun 30, 5:40 PM EDTSpecial Weather StatementPBZHarrison35 min
Jun 30, 6:06 PM EDTSpecial Weather StatementPBZCoshocton24 min
Jun 30, 6:10 PM EDTSevere Thunderstorm WarningPBZCoshocton50 min
Jun 30, 7:02 PM EDTSpecial Weather StatementPBZCoshocton28 min
Jun 30, 3:00 PM EDTSpecial Weather StatementPBZHancock30 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2013Every severe thunderstorm warning in 2013

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.