Alert archive / Louisiana / Mesoscale Discussions in 2008

Mesoscale Discussion 924

May 14, 200816 parishes in Louisiana; 11 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 14, 2008, 1:55 PM CDT for 16 parishes in Louisiana; 11 counties in Mississippi. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: May 14, 2008, 1:55 PM CDT (18:55 UTC)
Expired: May 14, 2008, 3:00 PM CDT
In force: 65 min
Issued by: the Storm Prediction Center

All 27 counties

Ascension Parish, LA, Avoyelles Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Saint Martin Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Jefferson County, MS, Lawrence County, MS, Lincoln County, MS, Pike County, MS, Walthall County, MS, Wilkinson County, MS

The watches that followed

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

Tornado Watch 321May 14, 2:05 PM CDT

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 6.9 hours before the alert went out and 160 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: 363 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 746 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 45 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

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
May 13, 7:11 PM CDT	Mesoscale Discussion	SPC	Acadia, Ascension, Assumption, Avoyelles, Bienville, Bossier and 45 more	2 hr
May 14, 2:28 AM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Claiborne, De Soto, Natchitoches and 3 more	92 min
May 14, 7:31 AM CDT	Mesoscale Discussion	SPC	Beauregard, Bienville, De Soto, Grant, Jackson, LaSalle and 7 more	119 min
May 14, 7:50 AM CDT	Tornado Watch	SPC	Beauregard, Caldwell, De Soto, Grant, LaSalle, Natchitoches and 5 more	7 hr
May 14, 10:23 AM CDT	Mesoscale Discussion	SPC	Beauregard, Bienville, De Soto, Grant, Jackson, LaSalle and 7 more	97 min
May 14, 2:04 PM CDT	Tornado Watch	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 31 more	7 hr
May 14, 5:12 PM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 34 more	63 min

Nearby

Mesoscale Discussions in Louisiana, 2008 Mesoscale Discussions in Mississippi, 2008 Every 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.