Alert archive / Tennessee / Mesoscale Discussions in 2006

Mesoscale Discussion 808

May 9, 200611 counties in Alabama; 27 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at May 9, 2006, 2:55 PM CDT for 11 counties in Alabama; 27 counties in Tennessee. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 9, 2006, 2:55 PM CDT (19:55 UTC)
Expired
May 9, 2006, 5:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 38 counties

Colbert County, AL, Cullman County, AL, Franklin County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Morgan County, AL, Walker County, AL, Winston County, AL, Bedford County, TN, Cannon County, TN, Cheatham County, TN, Coffee County, TN, Davidson County, TN, DeKalb County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hickman County, TN, Jackson County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marshall County, TN, Maury County, TN, Moore County, TN, Putnam County, TN, Rutherford County, TN, Smith County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN, White County, TN, Williamson County, TN, Wilson County, TN

The radar

The Northeast Alabama radar (KHTX), 91 km from the middle of the area, began a volume at 19:57 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, 7.9 hours before the alert went out and 140 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 2006-05-09Temperature 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 2006-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 square meters per square second.193958Sfc1 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
810 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
80 m²/s²
0-3 km storm-relative helicity
124 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
May 8, 7:42 PM CDTMesoscale DiscussionSPCBaldwin, Barbour, Bullock, Butler, Choctaw, Clarke and 17 more93 min
May 8, 7:56 PM CDTSevere Thunderstorm WatchSPCBaldwin, Clarke, Conecuh, Covington, Escambia, Mobile and 2 more5 hr
May 8, 10:00 PM CDTMesoscale DiscussionSPCCoffee, Dale, Geneva, Henry, Houston2 hr
May 9, 9:47 AM CDTMesoscale DiscussionSPCBaldwin, Escambia, Mobile, Washington118 min
May 9, 10:26 AM CDTSevere Thunderstorm WatchSPCBaldwin, Choctaw, Clarke, Conecuh, Escambia, Mobile and 2 more7 hr
May 9, 12:29 PM CDTMesoscale DiscussionSPCLauderdale, Limestone, Madison91 min
May 9, 3:57 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Butler, Chilton, Choctaw, Clarke and 15 more2 hr
May 9, 4:47 PM CDTSevere Thunderstorm WatchSPCAutauga, Bibb, Blount, Butler, Chilton, Choctaw and 28 more5 hr
May 9, 6:33 PM CDTMesoscale DiscussionSPCAutauga, Barbour, Bullock, Butler, Choctaw, Clarke and 20 more57 min
May 9, 10:00 AM CDTMesoscale DiscussionSPCCrockett, Dyer, Gibson, Haywood, Lake, Lauderdale and 4 more2 hr
May 9, 10:05 AM CDTSevere Thunderstorm WatchSPCCrockett, Dyer, Fayette, Gibson, Hardeman, Haywood and 6 more5 hr

Nearby

Mesoscale Discussions in Tennessee, 2006Mesoscale Discussions in Alabama, 2006Every mesoscale discussion in 2006

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.