Alert archive / Virginia / Mesoscale Discussions in 2014

Mesoscale Discussion 1269

July 3, 201414 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 3, 2014, 8:13 PM EDT for 14 counties in Virginia. It was in force for 32 min.

The area

The outline as issued.

The facts

Issued: Jul 3, 2014, 8:13 PM EDT (00:13 UTC)
Expired: Jul 3, 2014, 8:45 PM EDT
In force: 32 min
Issued by: the Storm Prediction Center

Counties Alleghany County, VA, Amherst County, VA, Bedford County, VA, Botetourt County, VA, City of Buena Vista, VA, City of Covington, VA, City of Lexington, VA, City of Lynchburg, VA, City of Roanoke, VA, City of Salem, VA, Franklin County, VA, Nelson County, VA, Roanoke County, VA, Rockbridge County, VA

The radar

The Roanoke radar (KFCX), 79 km from the middle of the area, began a volume at 00:15 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 0.2 hours before the alert went out and 161 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: 298 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 1273 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 24 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, 9:23 PM EDT	Mesoscale Discussion	SPC	Greensville, Isle of Wight, Southampton, City of Chesapeake, City of Emporia, City of Franklin and 4 more	67 min
Jul 3, 9:49 PM EDT	Tornado Watch	SPC	City of Chesapeake, City of Norfolk, City of Suffolk, City of Virginia Beach	6 hr
Jul 4, 3:58 AM EDT	Mesoscale Discussion	SPC	Mathews, Northampton, City of Hampton, City of Norfolk, City of Poquoson, City of Portsmouth and 1 more	2 hr

Nearby

Mesoscale Discussions in Virginia, 2014 Every mesoscale discussion in 2014

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.