Alert archive / Tennessee / Mesoscale Discussions in 2005

Mesoscale Discussion 476

April 1, 20054 counties in Alabama; 9 counties in Mississippi; 35 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 1, 2005, 11:16 AM CST for 4 counties in Alabama; 9 counties in Mississippi; 35 counties in Tennessee. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 1, 2005, 11:16 AM CST (17:16 UTC)
Expired
Apr 1, 2005, 1:45 PM CST
In force
2 hr
Issued by
the Storm Prediction Center
All 48 counties

Colbert County, AL, Franklin County, AL, Lauderdale County, AL, Limestone County, AL, Alcorn County, MS, Benton County, MS, Itawamba County, MS, Lee County, MS, Pontotoc County, MS, Prentiss County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Bedford County, TN, Cannon County, TN, Cheatham County, TN, Chester County, TN, Coffee County, TN, Davidson County, TN, Decatur County, TN, DeKalb County, TN, Dickson County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hardeman County, TN, Hardin County, TN, Henderson County, TN, Hickman County, TN, Humphreys County, TN, Jackson County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Macon County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Moore County, TN, Perry County, TN, Rutherford County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Warren County, TN, Wayne County, TN, Williamson County, TN, Wilson County, TN

The radar

The Columbus AFB radar (KGWX), 136 km from the middle of the area, began a volume at 17:18 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 12:00Z, 5.3 hours before the alert went out and 159 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 12:00Z on 2005-04-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 2005-04-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 151 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2127 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
151 m²/s²
0-3 km storm-relative helicity
226 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.

IssuedProductOfficeCountiesLasted
Apr 1, 1:29 AM CSTMesoscale DiscussionSPCBaldwin, Clarke, Escambia, Mobile, Washington2 hr
Apr 1, 2:05 AM CSTTornado WatchSPCBaldwin, Coffee, Conecuh, Covington, Escambia, Mobile and 1 more5 hr
Apr 1, 11:20 AM CSTMesoscale DiscussionSPCBibb, Blount, Chilton, Choctaw, Cullman, Dallas and 18 more115 min
Apr 1, 11:45 AM CSTSevere Thunderstorm WatchSPCAutauga, Bibb, Blount, Chilton, Colbert, Cullman and 26 more6 hr
Apr 1, 3:00 PM CSTMesoscale DiscussionSPCBibb, Blount, Chilton, Cullman, Dallas, Greene and 13 more90 min
Apr 1, 3:19 PM CSTMesoscale DiscussionSPCBaldwin, Choctaw, Clarke, Conecuh, Mobile, Monroe and 2 more116 min
Apr 1, 4:55 PM CSTMesoscale DiscussionSPCAutauga, Butler, Calhoun, Cherokee, Clay, Cleburne and 12 more65 min
Mar 31, 8:59 PM CSTMesoscale DiscussionSPCAdams, Amite, Covington, Forrest, Franklin, George and 18 more61 min
Mar 31, 10:53 PM CSTMesoscale DiscussionSPCAdams, Amite, Claiborne, Clarke, Copiah, Covington and 34 more67 min
Mar 31, 11:15 PM CSTTornado WatchSPCAdams, Amite, Claiborne, Clarke, Copiah, Covington and 34 more8 hr
Apr 1, 4:14 AM CSTMesoscale DiscussionSPCClarke, Covington, Forrest, George, Greene, Jasper and 16 more2 hr

Nearby

Mesoscale Discussions in Tennessee, 2005Mesoscale Discussions in Mississippi, 2005Mesoscale Discussions in Alabama, 2005Every 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.