Alert archive / Tennessee / Mesoscale Discussions in 2008

Mesoscale Discussion 175

February 6, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Feb 6, 2008, 2:41 AM CST for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Feb 6, 2008, 2:41 AM CST (08:41 UTC)
Expired
Feb 6, 2008, 4:45 AM CST
In force
2 hr
Issued by
the Storm Prediction Center
All 105 counties

Bibb County, AL, Blount County, AL, Calhoun County, AL, Cherokee County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Hale County, AL, Jackson County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Perry County, AL, Pickens County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Floyd County, GA, Murray County, GA, Walker County, GA, Whitfield County, GA, Clarke County, MS, Clay County, MS, Jasper County, MS, Kemper County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Lowndes County, MS, Monroe County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Winston County, MS, Anderson County, TN, Bedford County, TN, Bledsoe County, TN, Bradley County, TN, Campbell County, TN, Cannon County, TN, Claiborne County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Jackson County, TN, Knox County, TN, Lawrence County, TN, Lincoln County, TN, Loudon County, TN, Macon County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Moore County, TN, Morgan County, TN, Overton County, TN, Pickett County, TN, Polk County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Rutherford County, TN, Scott County, TN, Sequatchie County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Union County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Williamson County, TN, Wilson County, TN

The radar

The Columbus AFB radar (KGWX), 76 km from the middle of the area, began a volume at 08:42 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

Birmingham, AL (KBMX), launched 00:00Z, 8.7 hours before the alert went out and 98 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, Birmingham, AL at 00:00Z on 2008-02-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 771 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, Birmingham, AL at 00:00Z on 2008-02-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 223 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
771 J/kg
Mixed-layer CIN
-36 J/kg
Mixed-layer LCL
947 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
223 m²/s²
0-3 km storm-relative helicity
320 m²/s²
Significant tornado parameter
1.3
Supercell composite
4.9

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
Feb 5, 9:39 PM CSTMesoscale DiscussionSPCBlount, Colbert, Cullman, Fayette, Franklin, Jackson and 10 more96 min
Feb 5, 10:01 PM CSTTornado WatchSPCBibb, Blount, Colbert, Cullman, DeKalb, Etowah and 23 more8 hr
Feb 6, 1:23 AM CSTTornado WatchSPCChoctaw, Clarke, Mobile, Washington6 hr
Feb 6, 4:06 AM CSTTornado WatchSPCAutauga, Bibb, Blount, Calhoun, Cherokee, Chilton and 24 more6 hr
Feb 6, 4:27 AM CSTMesoscale DiscussionSPCBaldwin, Butler, Clarke, Coffee, Conecuh, Covington and 7 more2 hr
Feb 6, 5:04 AM CSTTornado WatchSPCBaldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more5 hr
Feb 6, 6:10 AM CSTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Bullock, Butler, Calhoun and 34 more2 hr
Feb 6, 7:06 AM CSTTornado WatchSPCBarbour, Bullock, Chambers, Coffee, Dale, Geneva and 6 more6 hr
Feb 6, 10:20 AM CSTMesoscale DiscussionSPCBarbour, Bullock, Coffee, Dale, Geneva, Henry and 3 more85 min
Feb 6, 7:49 AM CSTMesoscale DiscussionSPCFannin, Gilmer, Habersham, Lumpkin, Murray, Rabun and 4 more116 min
Feb 6, 1:52 PM CSTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 56 more53 min
Feb 5, 8:07 PM CSTMesoscale DiscussionSPCAlcorn, Benton, Bolivar, Calhoun, Carroll, Coahoma and 24 more83 min
Feb 6, 1:02 AM CSTMesoscale DiscussionSPCAmite, Forrest, George, Greene, Hancock, Harrison and 11 more58 min
Feb 5, 6:59 PM CSTMesoscale DiscussionSPCCheatham, Davidson, Dickson, Giles, Hickman, Houston and 12 more91 min
Feb 5, 7:19 PM CSTTornado WatchSPCBenton, Cheatham, Davidson, Dickson, Giles, Hickman and 17 more6 hr
Feb 5, 9:19 PM CSTMesoscale DiscussionSPCCheatham, Clay, Davidson, Dickson, Fentress, Houston and 12 more86 min
Feb 5, 11:59 PM CSTTornado WatchSPCCampbell, Morgan, Scott4 hr

Nearby

Mesoscale Discussions in Tennessee, 2008Mesoscale Discussions in Alabama, 2008Mesoscale Discussions in Mississippi, 2008Every mesoscale discussion in 2008

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.