Alert archive / Florida / Mesoscale Discussions in 2007

Mesoscale Discussion 155

February 13, 200714 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Feb 13, 2007, 3:15 PM EST for 14 counties in Florida. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Feb 13, 2007, 3:15 PM EST (20:15 UTC)
Expired: Feb 13, 2007, 4:15 PM EST
In force: 60 min
Issued by: the Storm Prediction Center

Counties Brevard County, FL, Flagler County, FL, Glades County, FL, Hardee County, FL, Highlands County, FL, Indian River County, FL, Martin County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Polk County, FL, Saint Lucie County, FL, Seminole County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 45 km from the middle of the area, began a volume at 20:18 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 8.3 hours before the alert went out and 80 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: 728 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 650 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 94 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

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 13, 3:43 AM EST	Tornado Watch	SPC	Escambia, Okaloosa, Santa Rosa	10 hr
Feb 13, 8:24 AM EST	Mesoscale Discussion	SPC	Escambia, Santa Rosa	96 min
Feb 13, 9:52 AM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 8 more	53 min
Feb 13, 10:07 AM EST	Tornado Watch	SPC	Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 11 more	7 hr
Feb 13, 11:17 AM EST	Mesoscale Discussion	SPC	Charlotte, DeSoto, Hardee, Hernando, Hillsborough, Lee and 5 more	88 min
Feb 13, 12:54 PM EST	Severe Thunderstorm Watch	SPC	Brevard, Charlotte, Citrus, DeSoto, Flagler, Glades and 25 more	5 hr
Feb 13, 1:08 PM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 11 more	67 min
Feb 13, 3:34 PM EST	Severe Thunderstorm Watch	SPC	Alachua, Baker, Bradford, Clay, Columbia, Duval and 5 more	5 hr

Nearby

Mesoscale Discussions in Florida, 2007 Every mesoscale discussion in 2007

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.