Alert archive / Alabama / Mesoscale Discussions in 2005

Mesoscale Discussion 477

April 1, 200524 counties in Alabama; 15 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 1, 2005, 11:20 AM CST for 24 counties in Alabama; 15 counties in Mississippi. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Apr 1, 2005, 11:20 AM CST (17:20 UTC)
Expired: Apr 1, 2005, 1:15 PM CST
In force: 115 min
Issued by: the Storm Prediction Center

All 39 counties

Bibb County, AL, Blount County, AL, Chilton County, AL, Choctaw County, AL, Cullman County, AL, Dallas County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Madison County, AL, Marengo 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, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Clarke County, MS, Jasper County, MS, Jones County, MS, Kemper County, MS, Lauderdale County, MS, Lowndes County, MS, Monroe County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Scott County, MS, Smith County, MS, Wayne County, MS, Winston County, MS

The radar

The Columbus AFB radar (KGWX), 115 km from the middle of the area, began a volume at 17:22 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.

Severe Thunderstorm Watch 122Apr 1, 11:45 AM CST

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 5.3 hours before the alert went out and 190 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: 39 J/kg
Mixed-layer CIN: -304 J/kg
Mixed-layer LCL: 671 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: -482 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -3.9

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.

Issued	Product	Office	Counties	Lasted
Apr 1, 1:29 AM CST	Mesoscale Discussion	SPC	Baldwin, Clarke, Escambia, Mobile, Washington	2 hr
Apr 1, 2:05 AM CST	Tornado Watch	SPC	Baldwin, Coffee, Conecuh, Covington, Escambia, Mobile and 1 more	5 hr
Apr 1, 11:16 AM CST	Mesoscale Discussion	SPC	Colbert, Franklin, Lauderdale, Limestone	2 hr
Apr 1, 11:45 AM CST	Severe Thunderstorm Watch	SPC	Autauga, Bibb, Blount, Chilton, Colbert, Cullman and 26 more	6 hr
Apr 1, 3:00 PM CST	Mesoscale Discussion	SPC	Bibb, Blount, Chilton, Cullman, Dallas, Greene and 13 more	90 min
Apr 1, 3:19 PM CST	Mesoscale Discussion	SPC	Baldwin, Choctaw, Clarke, Conecuh, Mobile, Monroe and 2 more	116 min
Apr 1, 4:55 PM CST	Mesoscale Discussion	SPC	Autauga, Butler, Calhoun, Cherokee, Clay, Cleburne and 12 more	65 min
Mar 31, 8:59 PM CST	Mesoscale Discussion	SPC	Adams, Amite, Covington, Forrest, Franklin, George and 18 more	61 min
Mar 31, 10:53 PM CST	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Clarke, Copiah, Covington and 34 more	67 min
Mar 31, 11:15 PM CST	Tornado Watch	SPC	Adams, Amite, Claiborne, Clarke, Copiah, Covington and 34 more	8 hr
Apr 1, 4:14 AM CST	Mesoscale Discussion	SPC	Clarke, Covington, Forrest, George, Greene, Jasper and 16 more	2 hr

Nearby

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