Alert archive / Mississippi / Mesoscale Discussions in 2015

Mesoscale Discussion 173

March 31, 2015Crittenden County, Cross County, Poinsett County, Arkansas; 12 counties in Mississippi; Fayette County, Shelby County, Tennessee

The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2015, 11:43 PM CDT for Crittenden County, Cross County, Poinsett County, Arkansas; 12 counties in Mississippi; Fayette County, Shelby County, Tennessee. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Mar 31, 2015, 11:43 PM CDT (04:43 UTC)
Expired: Apr 1, 2015, 1:15 AM CDT
In force: 92 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Crittenden County, AR, Cross County, AR, Poinsett County, AR, Alcorn County, MS, Benton County, MS, DeSoto County, MS, Itawamba County, MS, Lee County, MS, Marshall County, MS, Pontotoc County, MS, Prentiss County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Fayette County, TN, Shelby County, TN

The radar

The Memphis radar (KNQA), 77 km from the middle of the area, began a volume at 04:46 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 nearest sounding before it

Little Rock, AR (KBYH), launched 00:00Z, 4.7 hours before the alert went out and 53 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: 1687 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 1334 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 15 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -1.1

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
Mar 31, 8:14 PM CDT	Mesoscale Discussion	SPC	Crawford, Franklin, Sebastian	91 min
Mar 31, 8:50 PM CDT	Mesoscale Discussion	SPC	Clay, Cleburne, Craighead, Crittenden, Cross, Faulkner and 10 more	85 min
Apr 1, 1:16 AM CDT	Mesoscale Discussion	SPC	Polk, Scott	89 min
Apr 1, 12:39 PM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 8 more	3 hr
Apr 1, 5:14 PM CDT	Mesoscale Discussion	SPC	Arkansas, Baxter, Boone, Carroll, Clark, Clay and 54 more	91 min

Nearby

Mesoscale Discussions in Mississippi, 2015 Mesoscale Discussions in Arkansas, 2015 Mesoscale Discussions in Tennessee, 2015 Every mesoscale discussion in 2015

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.