Alert archive / Florida / Mesoscale Discussions in 2004

Mesoscale Discussion 347

April 13, 2004Miami-Dade County, Monroe County, Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2004, 2:35 AM EDT for Miami-Dade County, Monroe County, Florida. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued
Apr 13, 2004, 2:35 AM EDT (06:35 UTC)
Expired
Apr 13, 2004, 4:30 AM EDT
In force
115 min
Issued by
the Storm Prediction Center

Counties Miami-Dade County, FL, Monroe County, FL

The radar

The Key West radar (KBYX), 66 km from the middle of the area, began a volume at 06:36 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Key West, FL (KEYW), launched 00:00Z, 6.6 hours before the alert went out and 70 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-pSkew-T log-p diagram, Key West, FL at 00:00Z on 2004-04-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1514 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Key West, FL at 00:00Z on 2004-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 179 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1514 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
850 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
179 m²/s²
0-3 km storm-relative helicity
285 m²/s²
Significant tornado parameter
2.3
Supercell composite
11.0

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.

IssuedProductOfficeCountiesLasted
Apr 12, 10:25 PM EDTMesoscale DiscussionSPCCollier, Hendry, Monroe3 hr
Apr 13, 2:45 AM EDTTornado WatchSPCBroward, Collier, Hendry, Miami-Dade, Monroe, Palm Beach5 hr

Nearby

Mesoscale Discussions in Florida, 2004Every mesoscale discussion in 2004

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.