Alert archive / Georgia / Mesoscale Discussions in 2014

Mesoscale Discussion 1990

December 23, 201425 counties in Alabama; 20 counties in Florida; 46 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Dec 23, 2014, 7:03 PM CST for 25 counties in Alabama; 20 counties in Florida; 46 counties in Georgia. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Dec 23, 2014, 7:03 PM CST (01:03 UTC)
Expired: Dec 23, 2014, 8:30 PM CST
In force: 87 min
Issued by: the Storm Prediction Center

All 91 counties

Barbour County, AL, Bullock County, AL, Butler County, AL, Chambers County, AL, Clay County, AL, Coffee County, AL, Conecuh County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Elmore County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Montgomery County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Talladega County, AL, Tallapoosa County, AL, Bay County, FL, Calhoun County, FL, Dixie County, FL, Escambia County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Okaloosa County, FL, Santa Rosa County, FL, Taylor County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Brooks County, GA, Calhoun County, GA, Chattahoochee County, GA, Clay County, GA, Colquitt County, GA, Cook County, GA, Crawford County, GA, Crisp County, GA, Decatur County, GA, Dooly County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Harris County, GA, Heard County, GA, Houston County, GA, Irwin County, GA, Lee County, GA, Lowndes County, GA, Macon County, GA, Marion County, GA, Meriwether County, GA, Miller County, GA, Mitchell County, GA, Muscogee County, GA, Peach County, GA, Pike County, GA, Pulaski County, GA, Quitman County, GA, Randolph County, GA, Schley County, GA, Seminole County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taylor County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Troup County, GA, Turner County, GA, Upson County, GA, Webster County, GA, Wilcox County, GA, Worth County, GA

The radar

The Ft Rucker radar (KEOX), 57 km from the middle of the area, began a volume at 01:04 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.

Tornado Watch 562Dec 23, 10:55 PM CST

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 1.1 hours before the alert went out and 116 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 509 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 397 m²/s²
0-3 km storm-relative helicity: 547 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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
Dec 23, 10:22 PM CST	Mesoscale Discussion	SPC	Houston	53 min
Dec 24, 2:10 AM CST	Mesoscale Discussion	SPC	Houston	2 hr
Dec 23, 10:55 PM CST	Tornado Watch	SPC	Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 13 more	9 hr
Dec 24, 4:02 AM CST	Mesoscale Discussion	SPC	Baker, Bay, Calhoun, Columbia, Dixie, Franklin and 16 more	118 min
Dec 24, 5:32 AM CST	Tornado Watch	SPC	Baker, Bay, Calhoun, Columbia, Dixie, Franklin and 13 more	7 hr
Dec 24, 7:50 AM CST	Mesoscale Discussion	SPC	Baker, Bradford, Columbia, Dixie, Franklin, Gadsden and 13 more	115 min

Nearby

Mesoscale Discussions in Georgia, 2014 Mesoscale Discussions in Alabama, 2014 Mesoscale Discussions in Florida, 2014 Every 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.