Alert archive / Pennsylvania / Areal Flood Warnings in 2021

Areal Flood Warning 4, NWS Pittsburgh, PA

June 21, 20214 counties in Pennsylvania; Brooke County, Marshall County, Ohio County, West Virginia; Belmont County, Jefferson County, Ohio

NWS Pittsburgh, PA issued this areal flood warning at Jun 21, 2021, 8:40 PM EDT for 4 counties in Pennsylvania; Brooke County, Marshall County, Ohio County, West Virginia; Belmont County, Jefferson County, Ohio. It was in force for 2 hr. 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 21, 2021, 8:40 PM EDT (00:40 UTC)
Expired: Jun 21, 2021, 10:45 PM EDT
In force: 2 hr
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Flood severity: None

Counties Belmont County, OH, Jefferson County, OH, Allegheny County, PA, Greene County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Marshall County, WV, Ohio County, WV

The radar

The Pittsburgh radar (KPBZ), 44 km from the middle of the area, began a volume at 00:44 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 (KPIT), launched 00:00Z, 0.7 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-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: 190 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 802 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood 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 areal flood warning went out at Jun 21, 7:37 PM EDT, 1 hour 3 minutes earlier.

Area forecast discussion, Jun 21, 7:37 PM EDT, 1 hour 3 minutes before

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Hazardous weather outlook, Jun 21, 7:33 PM EDT, 1 hour 7 minutes before

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In the hours before

Local storm report, Jun 21, 6:51 PM EDT, 1 hour 49 minutes before

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Local storm report, Jun 21, 6:53 PM EDT, 1 hour 47 minutes before

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Local storm report, Jun 21, 7:25 PM EDT, 1 hour 15 minutes before

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Local storm report, Jun 21, 7:48 PM EDT, 52 minutes before

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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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Local storm report, Jun 21, 7:53 PM EDT, 47 minutes before

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<body>
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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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Local storm report, Jun 21, 7:54 PM EDT, 46 minutes before

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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.
      </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.
      </p>
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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 21, 10:44 PM EDT	Areal Flood Warning	PBZ	Allegheny, Fayette, Greene, Washington, Westmoreland	3 hr

Nearby

Areal Flood Warnings in Pennsylvania, 2021 Areal Flood Warnings in West Virginia, 2021 Areal Flood Warnings in Ohio, 2021 Every areal flood warning in 2021

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.