Alert archive / Virginia / Mesoscale Discussions in 2005

Mesoscale Discussion 977

May 23, 200513 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at May 23, 2005, 6:42 PM EDT for 13 counties in Virginia. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: May 23, 2005, 6:42 PM EDT (22:42 UTC)
Expired: May 23, 2005, 7:45 PM EDT
In force: 63 min
Issued by: the Storm Prediction Center

Counties Amelia County, VA, City of Emporia, VA, City of Franklin, VA, City of Suffolk, VA, Cumberland County, VA, Dinwiddie County, VA, Fluvanna County, VA, Goochland County, VA, Greensville County, VA, Nottoway County, VA, Powhatan County, VA, Southampton County, VA, Sussex County, VA

The radar

The Norfolk radar (KAKQ), 31 km from the middle of the area, began a volume at 22:42 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 10.7 hours before the alert went out and 191 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: 4 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 1409 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 179 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
May 23, 1:16 PM EDT	Mesoscale Discussion	SPC	Brunswick, Caroline, Charles City, Chesterfield, Dinwiddie, Essex and 37 more	89 min
May 23, 3:50 PM EDT	Severe Thunderstorm Watch	SPC	Albemarle, Amelia, Caroline, Charles City, Chesterfield, Culpeper and 53 more	6 hr
May 23, 5:12 PM EDT	Mesoscale Discussion	SPC	Albemarle, Amelia, Caroline, Charles City, Chesterfield, Cumberland and 52 more	93 min
May 23, 5:36 PM EDT	Mesoscale Discussion	SPC	Alleghany, Amherst, Appomattox, Augusta, Bath, Bedford and 49 more	84 min

Nearby

Mesoscale Discussions in Virginia, 2005 Every mesoscale discussion in 2005

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.