Alert archive / Louisiana / Mesoscale Discussions in 2016

Mesoscale Discussion 127

February 23, 201610 parishes in Louisiana; Hancock County, Harrison County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 23, 2016, 3:08 PM CST for 10 parishes in Louisiana; Hancock County, Harrison County, Mississippi. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Feb 23, 2016, 3:08 PM CST (21:08 UTC)
Expired: Feb 23, 2016, 4:45 PM CST
In force: 97 min
Issued by: the Storm Prediction Center

Counties Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Terrebonne Parish, LA, Hancock County, MS, Harrison County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.1 hours before the alert went out and 73 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: 42 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 667 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 129 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Feb 23, 10:44 AM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, Iberia, Iberville, Jefferson and 13 more	91 min
Feb 23, 11:08 AM CST	Tornado Watch	SPC	Acadia, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia and 23 more	7 hr
Feb 23, 12:25 PM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 19 more	65 min
Feb 23, 1:15 PM CST	Mesoscale Discussion	SPC	East Feliciana, Saint Helena, Saint Tammany, Tangipahoa, Washington	2 hr
Feb 23, 2:13 PM CST	Tornado Watch PDS	SPC	Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 4 more	8 hr
Feb 23, 5:18 PM CST	Mesoscale Discussion	SPC	Saint Tammany	117 min
Feb 23, 2:20 PM CST	Tornado Watch	SPC	Adams, Attala, Carroll, Choctaw, Claiborne, Clay and 26 more	6 hr
Feb 23, 3:30 PM CST	Mesoscale Discussion	SPC	Claiborne, Copiah, Hinds, Madison, Rankin, Yazoo	90 min

Nearby

Mesoscale Discussions in Louisiana, 2016 Mesoscale Discussions in Mississippi, 2016 Every mesoscale discussion in 2016

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.