Alert archive / Tennessee / Mesoscale Discussions in 2003

Mesoscale Discussion 2526

November 18, 20035 counties in Georgia; 14 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Nov 18, 2003, 4:26 PM EST for 5 counties in Georgia; 14 counties in Tennessee. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Nov 18, 2003, 4:26 PM EST (21:26 UTC)
Expired: Nov 18, 2003, 6:00 PM EST
In force: 94 min
Issued by: the Storm Prediction Center

Counties Fannin County, GA, Gilmer County, GA, Gordon County, GA, Murray County, GA, Whitfield County, GA, Anderson County, TN, Bradley County, TN, Campbell County, TN, Cumberland County, TN, Fentress County, TN, Loudon County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Scott County, TN

The radar

The Knoxville radar (KMRX), 122 km from the middle of the area, began a volume at 21:28 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

Nashville Metro, TN (KBNA), launched 12:00Z, 9.4 hours before the alert went out and 174 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: 1000 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 325 m²/s²
0-3 km storm-relative helicity: 386 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
Nov 18, 2:33 PM EST	Mesoscale Discussion	SPC	Catoosa, Chattooga, Dade, Murray, Walker, Whitfield	57 min
Nov 18, 2:55 PM EST	Tornado Watch	SPC	Catoosa, Chattooga, Dade, Gordon, Murray, Walker and 1 more	5 hr
Nov 18, 2:59 PM EST	Mesoscale Discussion	SPC	Baker, Bartow, Calhoun, Carroll, Chattahoochee, Cherokee and 40 more	91 min
Nov 18, 5:31 PM EST	Mesoscale Discussion	SPC	Baker, Calhoun, Carroll, Chattahoochee, Clay, Coweta and 27 more	29 min
Nov 18, 5:55 PM EST	Tornado Watch	SPC	Calhoun, Chattahoochee, Clay, Early, Harris, Lamar and 17 more	5 hr
Nov 18, 5:58 PM EST	Mesoscale Discussion	SPC	Catoosa, Chattooga, Dade, Fannin, Murray, Walker and 1 more	32 min
Nov 18, 2:29 AM EST	Mesoscale Discussion	SPC	Dyer, Fayette, Haywood, Lake, Lauderdale, Obion and 2 more	3 hr
Nov 18, 2:55 AM EST	Tornado Watch	SPC	Dyer, Lake, Lauderdale, Shelby, Tipton	6 hr
Nov 18, 7:08 AM EST	Mesoscale Discussion	SPC	Chester, Fayette, Hardeman, Hardin, Haywood, McNairy and 1 more	2 hr
Nov 18, 7:55 AM EST	Tornado Watch	SPC	Benton, Carroll, Cheatham, Chester, Crockett, Davidson and 29 more	5 hr

Nearby

Mesoscale Discussions in Tennessee, 2003 Mesoscale Discussions in Georgia, 2003 Every mesoscale discussion in 2003

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.