Alert archive / Georgia / Mesoscale Discussions in 2009

Mesoscale Discussion 690

May 3, 200922 counties in Alabama; 36 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at May 3, 2009, 3:13 PM CDT for 22 counties in Alabama; 36 counties in Georgia. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
May 3, 2009, 3:13 PM CDT (20:13 UTC)
Expired
May 3, 2009, 4:15 PM CDT
In force
62 min
Issued by
the Storm Prediction Center
All 58 counties

Barbour County, AL, Bullock County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Clay County, AL, Cleburne County, AL, Coffee County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Elmore County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Macon County, AL, Montgomery County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Talladega County, AL, Tallapoosa County, AL, Bartow County, GA, Butts County, GA, Carroll County, GA, Chattahoochee County, GA, Cherokee County, GA, Clay County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, DeKalb County, GA, Douglas County, GA, Fayette County, GA, Floyd County, GA, Fulton County, GA, Gordon County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Lamar County, GA, Marion County, GA, Meriwether County, GA, Muscogee County, GA, Newton County, GA, Paulding County, GA, Pike County, GA, Polk County, GA, Quitman County, GA, Randolph County, GA, Rockdale County, GA, Spalding County, GA, Stewart County, GA, Talbot County, GA, Troup County, GA, Upson County, GA, Webster County, GA

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 12:00Z, 8.2 hours before the alert went out and 122 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 12:00Z on 2009-05-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 365 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 12:00Z on 2009-05-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 193 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
365 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
527 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
193 m²/s²
0-3 km storm-relative helicity
180 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.0

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 2, 7:30 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Clay, Cullman, Etowah and 12 more60 min
May 2, 8:43 PM CDTTornado WatchSPCBibb, Blount, Chilton, Fayette, Greene, Hale and 9 more6 hr
May 2, 10:40 PM CDTMesoscale DiscussionSPCBibb, Greene, Hale, Jefferson, Pickens, Tuscaloosa2 hr
May 3, 7:18 AM CDTMesoscale DiscussionSPCBibb, Chilton, Fayette, Greene, Hale, Jefferson and 6 more57 min
May 3, 7:44 AM CDTSevere Thunderstorm WatchSPCBibb, Chilton, Fayette, Greene, Hale, Jefferson and 8 more8 hr
May 3, 9:24 AM CDTMesoscale DiscussionSPCChoctaw, Greene, Hale, Lamar, Marengo, Perry and 3 more66 min
May 3, 10:56 AM CDTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Bullock, Butler, Calhoun and 39 more64 min
May 3, 11:35 AM CDTSevere Thunderstorm WatchSPCAutauga, Baldwin, Barbour, Blount, Bullock, Butler and 29 more5 hr
May 3, 1:49 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Bullock, Butler, Calhoun, Chambers and 22 more56 min
May 3, 3:11 PM CDTSevere Thunderstorm WatchSPCCoffee, Dale, Geneva, Henry, Houston3 hr
May 3, 5:36 PM CDTMesoscale DiscussionSPCHenry84 min
May 3, 3:42 PM CDTSevere Thunderstorm WatchSPCBaldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 90 more4 hr
May 3, 6:29 PM CDTSevere Thunderstorm WatchSPCColumbia, Elbert, Franklin, Habersham, Hart, Lincoln and 3 more2 hr

Nearby

Mesoscale Discussions in Georgia, 2009Mesoscale Discussions in Alabama, 2009Every mesoscale discussion in 2009

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.