Alert archive / Alabama / Mesoscale Discussions in 2014

Mesoscale Discussion 469

April 28, 20145 states

The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2014, 11:20 PM CDT for 5 states. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
Apr 28, 2014, 11:20 PM CDT (04:20 UTC)
Expired
Apr 29, 2014, 12:45 AM CDT
In force
85 min
Issued by
the Storm Prediction Center
All 77 counties

Autauga County, AL, Bibb County, AL, Blount County, AL, Calhoun County, AL, Cherokee County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Dallas County, AL, DeKalb County, AL, Elmore County, AL, Etowah County, AL, Hale County, AL, Jefferson County, AL, Marengo County, AL, Marshall County, AL, Perry County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Washington County, AL, Wilcox County, AL, Bartow County, GA, Carroll County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Cobb County, GA, Dade County, GA, Dawson County, GA, Douglas County, GA, Fannin County, GA, Floyd County, GA, Forsyth County, GA, Gilmer County, GA, Gordon County, GA, Haralson County, GA, Lumpkin County, GA, Murray County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Rabun County, GA, Towns County, GA, Union County, GA, Walker County, GA, White County, GA, Whitfield County, GA, Clarke County, MS, Forrest County, MS, Greene County, MS, Jones County, MS, Lamar County, MS, Perry County, MS, Stone County, MS, Wayne County, MS, Cherokee County, NC, Clay County, NC, Graham County, NC, Haywood County, NC, Jackson County, NC, Macon County, NC, Swain County, NC, Blount County, TN, Bradley County, TN, Cocke County, TN, Hamilton County, TN, Loudon County, TN, McMinn County, TN, Monroe County, TN, Polk County, TN, Sevier County, TN

The radar

The Birmingham radar (KBMX), 17 km from the middle of the area, began a volume at 04:24 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, 4.3 hours before the alert went out and 17 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 2014-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1160 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 2014-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 236 square meters per square second.19395878Sfc1 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
1160 J/kg
Mixed-layer CIN
-40 J/kg
Mixed-layer LCL
1240 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
236 m²/s²
0-3 km storm-relative helicity
361 m²/s²
Significant tornado parameter
1.6
Supercell composite
9.6

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 28, 7:12 PM CDTMesoscale DiscussionSPCColbert, Cullman, Fayette, Franklin, Jackson, Lamar and 10 more93 min
Apr 28, 7:59 PM CDTTornado WatchSPCAutauga, Baldwin, Barbour, Bibb, Blount, Bullock and 51 more11 hr
Apr 28, 9:34 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Calhoun, Cherokee, Chilton and 23 more86 min
Apr 28, 10:53 PM CDTMesoscale DiscussionSPCBibb, Blount, Etowah, Jefferson, Marshall, St. Clair and 2 more97 min
Apr 29, 1:38 AM CDTMesoscale DiscussionSPCBaldwin, Barbour, Bullock, Butler, Chambers, Coffee and 18 more67 min
Apr 29, 1:56 AM CDTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston9 hr
Apr 29, 4:01 AM CDTMesoscale DiscussionSPCBarbour, Chambers, Dale, Geneva, Henry, Houston and 3 more89 min
Apr 29, 12:46 PM CDTTornado WatchSPCBaldwin, Mobile, Washington10 hr
Apr 29, 3:27 PM CDTMesoscale DiscussionSPCBibb, Blount, Choctaw, Colbert, Cullman, DeKalb and 20 more33 min
Apr 29, 3:56 PM CDTTornado WatchSPCBibb, Blount, Calhoun, Cherokee, Chilton, Colbert and 27 more4 hr
Apr 29, 3:58 PM CDTMesoscale DiscussionSPCClarke, Conecuh, Covington, Escambia, Monroe92 min
Apr 29, 6:01 PM CDTMesoscale DiscussionSPCChoctaw, Washington89 min
Apr 29, 6:55 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cullman, DeKalb, Etowah and 17 more95 min
Apr 28, 10:29 PM CDTMesoscale DiscussionSPCBanks, Habersham, Hall, Rabun, Stephens, Towns and 1 more61 min
Apr 28, 11:30 PM CDTTornado WatchSPCBanks, Dawson, Forsyth, Franklin, Habersham, Hall and 7 more7 hr
Apr 29, 7:13 AM CDTMesoscale DiscussionSPCBen Hill, Bleckley, Brooks, Colquitt, Cook, Crisp and 13 more92 min
Apr 29, 10:13 AM CDTMesoscale DiscussionSPCAtkinson, Berrien, Brooks, Clinch, Colquitt, Cook and 5 more62 min
Apr 29, 12:02 PM CDTMesoscale DiscussionSPCAdams, Amite, Attala, Carroll, Choctaw, Claiborne and 41 more88 min
Apr 29, 12:26 PM CDTMesoscale DiscussionSPCAlamance, Anson, Bladen, Cabarrus, Caswell, Catawba and 40 more94 min
Apr 29, 1:27 PM CDTTornado WatchSPCAnson, Beaufort, Bertie, Carteret, Chatham, Chowan and 38 more8 hr
Apr 29, 3:38 PM CDTMesoscale DiscussionSPCBeaufort, Bertie, Bladen, Camden, Carteret, Chowan and 27 more97 min
Apr 29, 6:22 PM CDTMesoscale DiscussionSPCBeaufort, Bertie, Carteret, Chowan, Craven, Cumberland and 26 more53 min
Apr 28, 9:10 PM CDTMesoscale DiscussionSPCAnderson, Campbell, Claiborne, Grainger, Morgan, Scott and 1 more65 min
Apr 29, 2:10 PM CDTMesoscale DiscussionSPCCannon, Cheatham, Clay, Davidson, DeKalb, Jackson and 8 more65 min

Nearby

Mesoscale Discussions in Alabama, 2014Mesoscale Discussions in Georgia, 2014Mesoscale Discussions in Tennessee, 2014Every mesoscale discussion in 2014

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.