Alert archive / Florida / Mesoscale Discussions in 2013

Mesoscale Discussion 231

February 26, 201314 counties in Florida; Decatur County, Seminole County, Georgia

The Storm Prediction Center issued this mesoscale discussion at Feb 26, 2013, 2:51 AM CST for 14 counties in Florida; Decatur County, Seminole County, Georgia. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Feb 26, 2013, 2:51 AM CST (08:51 UTC)
Expired: Feb 26, 2013, 4:45 AM CST
In force: 114 min
Issued by: the Storm Prediction Center

Counties Calhoun County, FL, Dixie County, FL, Gadsden County, FL, Gulf County, FL, Hamilton County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Suwannee County, FL, Taylor County, FL, Wakulla County, FL, Decatur County, GA, Seminole County, GA

The radar

The Tallahassee radar (KTLH), 33 km from the middle of the area, began a volume at 08:51 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, 8.9 hours before the alert went out and 32 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: 502 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 339 m²/s²
0-3 km storm-relative helicity: 337 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 25, 7:57 PM CST	Mesoscale Discussion	SPC	Escambia, Santa Rosa	63 min
Feb 25, 9:31 PM CST	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 10 more	59 min
Feb 25, 11:59 PM CST	Tornado Watch	SPC	Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 12 more	8 hr
Feb 26, 5:19 AM CST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 16 more	116 min
Feb 26, 5:49 AM CST	Tornado Watch	SPC	Alachua, Baker, Bradford, Brevard, Charlotte, Citrus and 31 more	8 hr
Feb 26, 10:38 AM CST	Mesoscale Discussion	SPC	Charlotte, Citrus, Clay, DeSoto, Duval, Flagler and 19 more	67 min
Feb 26, 7:44 AM CST	Mesoscale Discussion	SPC	Bulloch, Effingham, Screven	3 hr

Nearby

Mesoscale Discussions in Florida, 2013 Mesoscale Discussions in Georgia, 2013 Every mesoscale discussion in 2013

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.