Alert archive / West Virginia / Mesoscale Discussions in 2011

Mesoscale Discussion 1484

July 3, 20115 states

The Storm Prediction Center issued this mesoscale discussion at Jul 3, 2011, 3:22 PM EDT for 5 states. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Jul 3, 2011, 3:22 PM EDT (19:22 UTC)
Expired: Jul 3, 2011, 4:15 PM EDT
In force: 53 min
Issued by: the Storm Prediction Center

All 52 counties

Allegany County, MD, Carroll County, MD, Frederick County, MD, Garrett County, MD, Montgomery County, MD, Washington County, MD, Athens County, OH, Belmont County, OH, Hocking County, OH, Jackson County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Noble County, OH, Vinton County, OH, Washington County, OH, Adams County, PA, Bedford County, PA, Fayette County, PA, Franklin County, PA, Fulton County, PA, Greene County, PA, Somerset County, PA, City of Winchester, VA, Clarke County, VA, Frederick County, VA, Loudoun County, VA, Barbour County, WV, Berkeley County, WV, Doddridge County, WV, Gilmer County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Harrison County, WV, Jefferson County, WV, Lewis County, WV, Marion County, WV, Marshall County, WV, Mineral County, WV, Monongalia County, WV, Morgan County, WV, Pleasants County, WV, Preston County, WV, Ritchie County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Upshur County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV

The radar

The Pittsburgh radar (KPBZ), 132 km from the middle of the area, began a volume at 19:24 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 589Jul 3, 4:20 PM EDT

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 7.4 hours before the alert went out and 120 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: 568 J/kg
Mixed-layer CIN: -164 J/kg
Mixed-layer LCL: 1090 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 159 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 3, 4:21 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 8 more	7 hr
Jul 2, 9:01 PM EDT	Mesoscale Discussion	SPC	Ashtabula, Carroll, Columbiana, Cuyahoga, Geauga, Lake and 7 more	59 min

Nearby

Mesoscale Discussions in West Virginia, 2011 Mesoscale Discussions in Ohio, 2011 Mesoscale Discussions in Pennsylvania, 2011 Every mesoscale discussion in 2011

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.