Alert archive / Mississippi / Mesoscale Discussions in 2016

Mesoscale Discussion 1847

November 29, 20168 counties in Alabama; 29 parishes in Louisiana; 50 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Nov 29, 2016, 8:03 PM CST for 8 counties in Alabama; 29 parishes in Louisiana; 50 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Nov 29, 2016, 8:03 PM CST (02:03 UTC)
Expired: Nov 29, 2016, 10:30 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 87 counties

Choctaw County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Lamar County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Avoyelles Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Livingston Parish, LA, Madison Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Richland Parish, LA, Saint Helena Parish, LA, Saint Landry 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, Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Clarke County, MS, Clay County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Marion County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Warren County, MS, Wayne County, MS, Webster County, MS, Wilkinson County, MS, Winston County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 79 km from the middle of the area, began a volume at 02:04 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 508Nov 29, 8:50 PM CST

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 2.1 hours before the alert went out and 77 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: 1191 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 883 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: 391 m²/s²
0-3 km storm-relative helicity: 488 m²/s²
Significant tornado parameter: 3.5
Supercell composite: 15.4

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
Nov 29, 6:43 PM CST	Mesoscale Discussion	SPC	Colbert, Fayette, Franklin, Lamar, Lauderdale, Lawrence and 6 more	92 min
Nov 29, 6:47 PM CST	Tornado Watch	SPC	Cullman, DeKalb, Jackson, Lawrence, Limestone, Madison and 2 more	8 hr
Nov 29, 8:50 PM CST	Tornado Watch	SPC	Bibb, Blount, Fayette, Greene, Hale, Jefferson and 7 more	8 hr
Nov 29, 9:28 PM CST	Mesoscale Discussion	SPC	Cullman, DeKalb, Jackson, Lawrence, Limestone, Madison and 2 more	62 min
Nov 29, 10:28 PM CST	Tornado Watch	SPC	Colbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more	5 hr
Nov 29, 11:17 PM CST	Mesoscale Discussion	SPC	DeKalb, Jackson, Lawrence, Limestone, Madison, Morgan	118 min
Nov 29, 11:37 PM CST	Mesoscale Discussion	SPC	Fayette, Lamar, Pickens	113 min
Nov 30, 1:07 AM CST	Mesoscale Discussion	SPC	Blount, Cullman, DeKalb, Fayette, Jackson, Madison and 5 more	53 min
Nov 30, 2:54 AM CST	Tornado Watch	SPC	Bibb, Blount, Calhoun, Cherokee, Chilton, Cleburne and 22 more	7 hr
Nov 30, 4:57 AM CST	Tornado Watch	SPC	Choctaw, Clarke, Mobile, Washington	7 hr
Nov 30, 5:10 AM CST	Mesoscale Discussion	SPC	Bibb, Blount, Calhoun, Cherokee, Chilton, Clay and 27 more	95 min
Nov 30, 9:00 AM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Bibb, Blount, Bullock, Butler and 37 more	2 hr
Nov 30, 11:06 AM CST	Tornado Watch	SPC	Baldwin, Barbour, Bullock, Butler, Chambers, Coffee and 17 more	6 hr
Nov 30, 12:59 PM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Coffee, Covington, Crenshaw, Dale and 7 more	2 hr
Nov 30, 1:55 PM CST	Mesoscale Discussion	SPC	Barbour, Coffee, Covington, Dale, Geneva, Henry and 2 more	2 hr
Nov 29, 6:06 PM CST	Mesoscale Discussion	SPC	Caldwell, Catahoula, Concordia, East Carroll, Franklin, Grant and 6 more	114 min
Nov 29, 9:47 PM CST	Mesoscale Discussion	SPC	Concordia	58 min
Nov 30, 3:33 AM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 14 more	87 min

Nearby

Mesoscale Discussions in Mississippi, 2016 Mesoscale Discussions in Louisiana, 2016 Mesoscale Discussions in Alabama, 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; radar from the NEXRAD Level II archive.