Alert archive / Georgia / Mesoscale Discussions in 2008

Mesoscale Discussion 220

February 12, 20086 counties in Florida; 13 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Feb 12, 2008, 11:25 PM EST for 6 counties in Florida; 13 counties in Georgia. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Feb 12, 2008, 11:25 PM EST (04:25 UTC)
Expired: Feb 13, 2008, 1:00 AM EST
In force: 95 min
Issued by: the Storm Prediction Center

Counties Gadsden County, FL, Jefferson County, FL, Leon County, FL, Madison County, FL, Taylor County, FL, Wakulla County, FL, Berrien County, GA, Brooks County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Grady County, GA, Irwin County, GA, Lowndes County, GA, Mitchell County, GA, Thomas County, GA, Tift County, GA, Worth County, GA

The radar

The Tallahassee radar (KTLH), 44 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 nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 4.4 hours before the alert went out and 41 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: 1391 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 182 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

Issued	Product	Office	Counties	Lasted
Feb 12, 7:41 PM EST	Mesoscale Discussion	SPC	Alachua, Bradford, Brevard, Broward, Charlotte, Citrus and 34 more	2 hr
Feb 12, 8:11 PM EST	Mesoscale Discussion	SPC	Calhoun, Gadsden, Holmes, Jackson, Jefferson, Leon and 6 more	64 min
Feb 12, 8:30 PM EST	Tornado Watch	SPC	Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 11 more	4 hr
Feb 12, 9:39 PM EST	Mesoscale Discussion	SPC	Alachua, Broward, Charlotte, Citrus, Collier, DeSoto and 25 more	96 min
Feb 12, 10:20 PM EST	Tornado Watch	SPC	Brevard, Broward, Charlotte, Citrus, Collier, DeSoto and 30 more	9 hr
Feb 13, 3:12 AM EST	Mesoscale Discussion	SPC	Alachua, Brevard, Broward, Charlotte, Citrus, Collier and 30 more	93 min
Feb 13, 8:19 AM EST	Mesoscale Discussion	SPC	Broward, Charlotte, Collier, Glades, Hendry, Lee and 4 more	56 min
Feb 13, 10:52 AM EST	Mesoscale Discussion	SPC	Broward, Collier, Glades, Hendry, Martin, Miami-Dade and 4 more	53 min
Feb 13, 11:44 AM EST	Severe Thunderstorm Watch	SPC	Broward, Collier, Miami-Dade, Monroe, Palm Beach	4 hr

Nearby

Mesoscale Discussions in Georgia, 2008 Mesoscale Discussions in Florida, 2008 Every mesoscale discussion in 2008

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.