Alert archive / Pennsylvania / Winter Weather Advisories in 2008

Winter Weather Advisory 21, NWS Pittsburgh, PA

December 30, 20085 counties in Pennsylvania

NWS Pittsburgh, PA issued this winter weather advisory at Dec 30, 2008, 3:14 PM EST for 5 counties in Pennsylvania. It took effect at Dec 31, 2008, 12:00 AM EST. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: Dec 30, 2008, 3:14 PM EST (20:14 UTC)
In effect from: Dec 31, 2008, 12:00 AM EST
Expired: Dec 31, 2008, 3:26 PM EST
In force: 15 hr
Issued by: NWS Pittsburgh, PA

Counties Clarion County, PA, Forest County, PA, Jefferson County, PA, Mercer County, PA, Venango County, PA

The radar

The Pittsburgh radar (KPBZ), 104 km from the middle of the area, began a volume at 20:15 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, 8.2 hours before the alert went out and 319 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1924 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 141 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter weather advisory 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 winter weather advisory went out at Dec 30, 3:42 AM EST, 11 hours 32 minutes earlier.

Area forecast discussion, Dec 30, 3:42 AM EST, 11 hours 32 minutes before

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Hazardous weather outlook, Dec 30, 5:01 AM EST, 10 hours 13 minutes before

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  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
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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
Dec 29, 7:49 PM EST	Wind Advisory	PBZ	Clarion, Forest, Jefferson, Mercer, Venango	7 hr
Dec 30, 3:13 PM EST	Wind Advisory	PBZ		24 hr

Nearby

Winter Weather Advisories in Pennsylvania, 2008 Winter Weather Advisories in West Virginia, 2008 Every winter weather advisory in 2008

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.