Alert archive / Virginia / Mesoscale Discussions in 2008

Mesoscale Discussion 1202

June 4, 2008Charles County, Maryland; 20 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Jun 4, 2008, 2:01 PM EDT for Charles County, Maryland; 20 counties in Virginia. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Jun 4, 2008, 2:01 PM EDT (18:01 UTC)
Expired: Jun 4, 2008, 3:00 PM EDT
In force: 59 min
Issued by: the Storm Prediction Center

All 21 counties

Charles County, MD, Arlington County, VA, Caroline County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Manassas, VA, City of Manassas Park, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, King George County, VA, Loudoun County, VA, Louisa County, VA, Madison County, VA, Orange County, VA, Prince William County, VA, Rappahannock County, VA, Spotsylvania County, VA, Stafford County, VA

The radar

The Sterling radar (KLWX), 45 km from the middle of the area, began a volume at 18:05 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, 6.0 hours before the alert went out and 44 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: 163 J/kg
Mixed-layer CIN: -151 J/kg
Mixed-layer LCL: 867 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 149 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
Jun 4, 12:18 AM EDT	Mesoscale Discussion	SPC	Calvert, Charles, Prince George's, Saint Mary's	87 min
Jun 4, 9:18 AM EDT	Tornado Watch	SPC	Garrett	7 hr
Jun 4, 11:51 AM EDT	Mesoscale Discussion	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 11 more	84 min
Jun 4, 12:49 PM EDT	Tornado Watch	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 8 more	7 hr
Jun 4, 2:53 PM EDT	Tornado Watch	SPC	Caroline, Cecil, Dorchester, Kent, Queen Anne's, Somerset and 3 more	5 hr
Jun 4, 4:04 PM EDT	Mesoscale Discussion	SPC	Charles	116 min
Jun 4, 7:13 PM EDT	Mesoscale Discussion	SPC	Anne Arundel, Calvert, Caroline, Charles, Dorchester, Howard and 10 more	62 min
Jun 4, 7:34 PM EDT	Tornado Watch	SPC	Anne Arundel, Calvert, Caroline, Charles, Dorchester, Kent and 8 more	5 hr
Jun 4, 2:26 AM EDT	Tornado Watch	SPC	Albemarle, Alleghany, Amelia, Amherst, Appomattox, Augusta and 60 more	6 hr
Jun 4, 7:23 AM EDT	Mesoscale Discussion	SPC	Albemarle, Augusta, Bath, Caroline, Charles City, Chesterfield and 40 more	97 min
Jun 4, 2:39 PM EDT	Mesoscale Discussion	SPC	Buchanan	96 min

Nearby

Mesoscale Discussions in Virginia, 2008 Mesoscale Discussions in Maryland, 2008 Every mesoscale discussion 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.