Alert archive / Florida / Mesoscale Discussions in 2007

Mesoscale Discussion 497

April 15, 200710 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2007, 2:27 AM EDT for 10 counties in Florida. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 15, 2007, 2:27 AM EDT (06:27 UTC)
Expired: Apr 15, 2007, 4:30 AM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Alachua County, FL, Citrus County, FL, Dixie County, FL, Franklin County, FL, Gilchrist County, FL, Hernando County, FL, Lafayette County, FL, Levy County, FL, Suwannee County, FL, Taylor County, FL

The radar

The Tallahassee radar (KTLH), 194 km from the middle of the area, began a volume at 06:30 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, 6.5 hours before the alert went out and 194 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: 791 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 504 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 222 m²/s²
0-3 km storm-relative helicity: 198 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 5.0

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
Apr 14, 8:09 PM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 12 more	2 hr
Apr 14, 11:45 PM EDT	Tornado Watch	SPC	Calhoun, Franklin, Gadsden, Gulf, Jackson, Jefferson and 4 more	6 hr
Apr 15, 9:31 AM EDT	Mesoscale Discussion	SPC	Brevard, Broward, Charlotte, Collier, DeSoto, Flagler and 22 more	59 min
Apr 15, 9:45 AM EDT	Tornado Watch	SPC	Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 18 more	7 hr
Apr 15, 1:03 PM EDT	Mesoscale Discussion	SPC	Broward, Collier, Glades, Hendry, Highlands, Indian River and 7 more	117 min
Apr 15, 3:42 PM EDT	Mesoscale Discussion	SPC	Broward, Miami-Dade, Monroe, Palm Beach	93 min

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.