Alert archive / Louisiana / Mesoscale Discussions in 2019

Mesoscale Discussion 1003

June 6, 201914 parishes in Louisiana; 11 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jun 6, 2019, 9:30 AM CDT for 14 parishes in Louisiana; 11 counties in Mississippi. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jun 6, 2019, 9:30 AM CDT (14:30 UTC)
Expired: Jun 6, 2019, 10:30 AM CDT
In force: 60 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 25 counties

Ascension Parish, LA, Assumption Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Forrest County, MS, George County, MS, Hancock County, MS, Harrison County, MS, Lamar County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Stone County, MS, Walthall County, MS

The watches that followed

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

Tornado Watch 335Jun 6, 9:40 AM CDT

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 2.5 hours before the alert went out and 59 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: 2679 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 564 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 121 m²/s²
0-3 km storm-relative helicity: 232 m²/s²
Significant tornado parameter: 2.3
Supercell composite: 11.5

Open this sounding in Storm Lab

The text

As transmitted.

<!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
Jun 5, 11:27 PM CDT	Mesoscale Discussion	SPC	Acadia, Calcasieu, Cameron, Iberia, Jefferson Davis, Lafayette and 1 more	93 min
Jun 6, 2:54 AM CDT	Mesoscale Discussion	SPC	Acadia, Cameron, Iberia, Jefferson Davis, Lafayette, Vermilion	2 hr
Jun 6, 9:40 AM CDT	Tornado Watch	SPC	Ascension, Jefferson, Lafourche, Livingston, Orleans, Plaquemines and 8 more	6 hr
Jun 6, 12:51 PM CDT	Mesoscale Discussion	SPC	Orleans, Saint Bernard, Saint Tammany, Washington	84 min

Nearby

Mesoscale Discussions in Louisiana, 2019 Mesoscale Discussions in Mississippi, 2019 Every mesoscale discussion in 2019

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.