Alert archive / Louisiana / Mesoscale Discussions in 2008
Mesoscale Discussion 2209
The Storm Prediction Center issued this mesoscale discussion at Sep 3, 2008, 3:49 AM CDT for 12 parishes in Louisiana; 6 counties in Mississippi. It was in force for 116 min.
The area
The outline as issued.
The facts
- Issued
- Sep 3, 2008, 3:49 AM CDT (08:49 UTC)
- Expired
- Sep 3, 2008, 5:45 AM CDT
- In force
- 116 min
- Issued by
- the Storm Prediction Center
Counties Allen Parish, LA, Avoyelles Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Madison Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Tensas Parish, LA, West Feliciana Parish, LA, Adams County, MS, Claiborne County, MS, Franklin County, MS, Jefferson County, MS, Warren County, MS, Wilkinson County, MS
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Jackson, MS (KJAN), launched 00:00Z, 8.8 hours before the alert went out and 173 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.
- Mixed-layer CAPE
- 1223 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 546 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 159 m²/s²
- 0-3 km storm-relative helicity
- 257 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 6.1
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 |
|---|---|---|---|---|
| Sep 2, 7:40 PM CDT | Mesoscale Discussion | SPC | Ascension, Avoyelles, Catahoula, Concordia, East Baton Rouge, East Carroll and 22 more | 2 hr |
| Sep 2, 11:36 PM CDT | Tornado Watch | SPC | Acadia, Allen, Avoyelles, Caldwell, Catahoula, Concordia and 13 more | 7 hr |
| Sep 3, 6:21 AM CDT | Tornado Watch | SPC | Acadia, Allen, Avoyelles, Caldwell, Catahoula, Concordia and 14 more | 6 hr |
| Sep 3, 10:42 AM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 28 more | 2 hr |
| Sep 3, 12:39 PM CDT | Tornado Watch | SPC | Acadia, Ascension, Avoyelles, Caldwell, Catahoula, Concordia and 26 more | 6 hr |
| Sep 3, 3:04 PM CDT | Mesoscale Discussion | SPC | Acadia, Ascension, Assumption, Avoyelles, Caldwell, Catahoula and 27 more | 116 min |
| Sep 3, 5:24 PM CDT | Mesoscale Discussion | SPC | Avoyelles, Catahoula, Concordia, East Carroll, East Feliciana, Franklin and 6 more | 96 min |
| Sep 3, 5:58 PM CDT | Tornado Watch | SPC | Ascension, Avoyelles, Caldwell, Catahoula, Concordia, East Baton Rouge and 22 more | 8 hr |
Nearby
Mesoscale Discussions in Louisiana, 2008Mesoscale Discussions in Mississippi, 2008Every mesoscale discussion in 2008
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.