Alert archive / Alabama / Mesoscale Discussions in 2004

Mesoscale Discussion 2522

December 9, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Dec 9, 2004, 4:22 AM CST for 4 states. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Dec 9, 2004, 4:22 AM CST (10:22 UTC)
Expired: Dec 9, 2004, 5:45 AM CST
In force: 83 min
Issued by: the Storm Prediction Center

All 36 counties

Autauga County, AL, Baldwin County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Dallas County, AL, Escambia County, AL, Lowndes County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Perry County, AL, Sumter County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Santa Rosa County, FL, Plaquemines Parish, LA, Saint Bernard Parish, LA, Clarke County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jasper County, MS, Jones County, MS, Lamar County, MS, Lauderdale County, MS, Newton County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 56 km from the middle of the area, began a volume at 10:25 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.

Tornado Watch 916Dec 9, 4:45 AM CST

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 10.4 hours before the alert went out and 154 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: 124 J/kg
Mixed-layer CIN: -288 J/kg
Mixed-layer LCL: 610 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 158 m²/s²
0-3 km storm-relative helicity: 155 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

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
Dec 9, 4:45 AM CST	Tornado Watch	SPC	Autauga, Bibb, Chilton, Choctaw, Clarke, Coosa and 14 more	5 hr
Dec 9, 6:04 AM CST	Mesoscale Discussion	SPC	Autauga, Bibb, Chilton, Choctaw, Clarke, Dallas and 10 more	86 min
Dec 9, 7:46 AM CST	Mesoscale Discussion	SPC	Autauga, Bibb, Chilton, Choctaw, Clarke, Coosa and 9 more	89 min
Dec 9, 10:24 AM CST	Mesoscale Discussion	SPC	Barbour, Dale, Geneva, Henry, Houston, Russell	2 hr
Dec 9, 11:45 AM CST	Severe Thunderstorm Watch	SPC	Jackson	5 hr

Nearby

Mesoscale Discussions in Alabama, 2004 Mesoscale Discussions in Mississippi, 2004 Mesoscale Discussions in Florida, 2004 Every 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.