Alert archive / Georgia / Mesoscale Discussions in 2006

Mesoscale Discussion 609

April 21, 200615 counties in Alabama; 67 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2006, 8:05 PM CDT for 15 counties in Alabama; 67 counties in Georgia. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued
Apr 21, 2006, 8:05 PM CDT (01:05 UTC)
Expired
Apr 21, 2006, 10:00 PM CDT
In force
115 min
Issued by
the Storm Prediction Center
All 82 counties

Barbour County, AL, Bullock County, AL, Chambers County, AL, Coffee 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, Tallapoosa County, AL, Baker County, GA, Baldwin County, GA, Barrow County, GA, Bibb County, GA, Butts County, GA, Calhoun County, GA, Carroll County, GA, Chattahoochee County, GA, Clarke County, GA, Clay County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Crawford County, GA, Dawson County, GA, DeKalb County, GA, Dooly County, GA, Dougherty County, GA, Douglas County, GA, Early County, GA, Fayette County, GA, Forsyth County, GA, Fulton County, GA, Greene County, GA, Gwinnett County, GA, Hall County, GA, Hancock County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Houston County, GA, Jackson County, GA, Jasper County, GA, Jones County, GA, Lamar County, GA, Lee County, GA, Macon County, GA, Madison County, GA, Marion County, GA, Meriwether County, GA, Miller County, GA, Monroe County, GA, Morgan County, GA, Muscogee County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Peach County, GA, Pike County, GA, Putnam County, GA, Quitman County, GA, Randolph County, GA, Rockdale County, GA, Schley County, GA, Spalding County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taliaferro County, GA, Taylor County, GA, Terrell County, GA, Troup County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Webster County, GA, Wilkinson County, GA

The radar

The Atlanta radar (KFFC), 95 km from the middle of the area, began a volume at 01:05 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 1.1 hours before the alert went out and 96 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, Peachtre/Fal Fld, GA at 00:00Z on 2006-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 347 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 00:00Z on 2006-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 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
347 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
1609 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

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 21, 8:21 PM CDTSevere Thunderstorm WatchSPCBarbour, Bullock, Coffee, Covington, Crenshaw, Dale and 7 more7 hr
Apr 21, 10:40 PM CDTMesoscale DiscussionSPCBaldwin, Conecuh, Covington, Escambia, Geneva, Houston and 2 more2 hr
Apr 21, 10:48 PM CDTTornado WatchSPCBaldwin, Escambia, Mobile4 hr
Apr 22, 2:28 AM CDTMesoscale DiscussionSPCBarbour, Bullock, Dale, Geneva, Henry, Houston and 2 more62 min
Apr 22, 12:07 PM CDTMesoscale DiscussionSPCBaldwin, Barrow, Ben Hill, Bibb, Bleckley, Bulloch and 51 more83 min
Apr 22, 4:58 PM CDTMesoscale DiscussionSPCAppling, Bryan, Bulloch, Effingham, Evans, Screven and 1 more2 hr

Nearby

Mesoscale Discussions in Georgia, 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.