Alert archive / Tennessee / Mesoscale Discussions in 2003

Mesoscale Discussion 811

May 7, 20035 states

The Storm Prediction Center issued this mesoscale discussion at May 7, 2003, 2:16 AM EDT for 5 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
May 7, 2003, 2:16 AM EDT (06:16 UTC)
Expired
May 7, 2003, 5:15 AM EDT
In force
3 hr
Issued by
the Storm Prediction Center
All 97 counties

Fannin County, GA, Lumpkin County, GA, Towns County, GA, Union County, GA, White County, GA, Harrison County, IN, Adair County, KY, Allen County, KY, Barren County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Casey County, KY, Clinton County, KY, Cumberland County, KY, Edmonson County, KY, Grayson County, KY, Green County, KY, Hardin County, KY, Hart County, KY, Larue County, KY, Laurel County, KY, Lincoln County, KY, Logan County, KY, Marion County, KY, McCreary County, KY, Meade County, KY, Metcalfe County, KY, Monroe County, KY, Nelson County, KY, Pulaski County, KY, Russell County, KY, Simpson County, KY, Taylor County, KY, Todd County, KY, Warren County, KY, Washington County, KY, Wayne County, KY, Whitley County, KY, Cherokee County, NC, Clay County, NC, Graham County, NC, Anderson County, TN, Bedford County, TN, Benton County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Cannon County, TN, Cheatham County, TN, Chester County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, Davidson County, TN, Decatur County, TN, DeKalb County, TN, Dickson County, TN, Fentress County, TN, Grundy County, TN, Hamilton County, TN, Henderson County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Jackson County, TN, Knox County, TN, Lewis County, TN, Loudon County, TN, Macon County, TN, Marshall County, TN, Maury County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Montgomery County, TN, Morgan County, TN, Overton County, TN, Perry County, TN, Pickett County, TN, Polk County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Robertson County, TN, Rutherford County, TN, Scott County, TN, Sequatchie County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Williamson County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 35 km from the middle of the area, began a volume at 06:17 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.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 6.3 hours before the alert went out and 38 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-pSkew-T log-p diagram, Nashville Metro, TN at 00:00Z on 2003-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1519 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 00:00Z on 2003-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 92 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
1519 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
720 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
92 m²/s²
0-3 km storm-relative helicity
120 m²/s²
Significant tornado parameter
0.9
Supercell composite
3.1

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.

IssuedProductOfficeCountiesLasted
May 7, 12:32 AM EDTMesoscale DiscussionSPCCatoosa, Dade88 min
May 7, 11:24 AM EDTMesoscale DiscussionSPCBaldwin, Bartow, Bibb, Bleckley, Butts, Carroll and 58 more2 hr
May 7, 11:35 AM EDTTornado WatchSPCCarroll, Chattooga, Floyd, Haralson, Heard, Polk and 1 more5 hr
May 7, 3:30 PM EDTTornado WatchSPCBaldwin, Barrow, Bibb, Bleckley, Butts, Carroll and 61 more6 hr
May 7, 7:29 PM EDTMesoscale DiscussionSPCBaldwin, Bibb, Bleckley, Butts, Carroll, Chattahoochee and 52 more91 min
May 6, 10:35 PM EDTMesoscale DiscussionSPCPosey115 min
May 7, 12:50 AM EDTTornado WatchSPCCrawford, Floyd, Gibson, Harrison, Perry, Posey and 3 more6 hr
May 7, 2:41 AM EDTMesoscale DiscussionSPCFloyd, Harrison, Perry, Spencer3 hr
May 7, 1:42 PM EDTMesoscale DiscussionSPCBartholomew, Benton, Boone, Brown, Carroll, Cass and 43 more2 hr
May 7, 7:06 PM EDTMesoscale DiscussionSPCAdams, Allen, Benton, Carroll, Cass, DeKalb and 20 more114 min
May 7, 3:40 AM EDTSevere Thunderstorm WatchSPCBell, Breathitt, Clark, Clay, Elliott, Estill and 27 more5 hr
May 7, 5:26 AM EDTMesoscale DiscussionSPCBell, Breathitt, Clark, Clay, Elliott, Estill and 27 more2 hr
May 7, 5:55 AM EDTTornado WatchSPCFulton6 hr
May 7, 8:06 AM EDTMesoscale DiscussionSPCBedford, Benton, Cannon, Carroll, Cheatham, Chester and 40 more114 min
May 7, 8:35 AM EDTTornado WatchSPCBedford, Bledsoe, Cannon, Coffee, Cumberland, DeKalb and 14 more5 hr

Nearby

Mesoscale Discussions in Tennessee, 2003Mesoscale Discussions in Kentucky, 2003Mesoscale Discussions in Georgia, 2003Every 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.