Alert archive / Florida / Mesoscale Discussions in 2011

Mesoscale Discussion 323

March 31, 201116 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2011, 2:56 PM EDT for 16 counties in Florida. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Mar 31, 2011, 2:56 PM EDT (18:56 UTC)
Expired: Mar 31, 2011, 4:00 PM EDT
In force: 64 min
Issued by: the Storm Prediction Center

Counties Brevard County, FL, Charlotte County, FL, DeSoto County, FL, Glades County, FL, Hardee County, FL, Highlands County, FL, Hillsborough County, FL, Indian River County, FL, Lee County, FL, Manatee County, FL, Martin County, FL, Okeechobee County, FL, Osceola County, FL, Palm Beach County, FL, Polk County, FL, Saint Lucie County, FL

The radar

The Tampa radar (KTBW), 76 km from the middle of the area, began a volume at 19:00 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

Tampa Bay, FL (KTBW), launched 12:00Z, 6.9 hours before the alert went out and 76 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: -58 J/kg
Mixed-layer LCL: 787 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 543 m²/s²
0-3 km storm-relative helicity: 606 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.9

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
Mar 31, 4:40 AM EDT	Mesoscale Discussion	SPC	Alachua, Bradford, Citrus, Columbia, Dixie, Franklin and 19 more	2 hr
Mar 31, 6:00 AM EDT	Tornado Watch	SPC	Brevard, Charlotte, Citrus, DeSoto, Flagler, Glades and 25 more	7 hr
Mar 31, 9:39 AM EDT	Mesoscale Discussion	SPC	Brevard, Charlotte, Citrus, DeSoto, Glades, Hardee and 21 more	66 min
Mar 31, 12:12 PM EDT	Mesoscale Discussion	SPC	Brevard, Charlotte, Citrus, DeSoto, Glades, Hardee and 22 more	63 min
Mar 31, 12:46 PM EDT	Tornado Watch	SPC	Brevard, Charlotte, DeSoto, Glades, Hardee, Hendry and 15 more	7 hr
Mar 31, 6:22 PM EDT	Mesoscale Discussion	SPC	Brevard, Charlotte, DeSoto, Glades, Hardee, Highlands and 10 more	83 min

Nearby

Mesoscale Discussions in Florida, 2011 Every mesoscale discussion in 2011

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.