Alert archive / Mississippi / Mesoscale Discussions in 2003

Mesoscale Discussion 1041

May 17, 2003Chicot County, Arkansas; 18 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 17, 2003, 1:54 AM CDT for Chicot County, Arkansas; 18 counties in Mississippi. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: May 17, 2003, 1:54 AM CDT (06:54 UTC)
Expired: May 17, 2003, 3:00 AM CDT
In force: 66 min
Issued by: the Storm Prediction Center

Counties Chicot County, AR, Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Lafayette County, MS, Leflore County, MS, Montgomery County, MS, Pontotoc County, MS, Sunflower County, MS, Tallahatchie County, MS, Union County, MS, Washington County, MS, Webster County, MS, Yalobusha County, MS

The watches that followed

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

Tornado Watch 402May 17, 4:45 AM CDT

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 6.9 hours before the alert went out and 137 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: 2424 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 1112 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 141 m²/s²
0-3 km storm-relative helicity: 216 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 11.1

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
May 16, 8:14 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Cleveland, Columbia and 19 more	2 hr
May 16, 8:38 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Chicot, Crittenden, Cross, Desha and 10 more	97 min
May 16, 9:35 PM CDT	Tornado Watch	SPC	Arkansas, Ashley, Chicot, Craighead, Crittenden, Cross and 8 more	6 hr
May 17, 4:45 AM CDT	Tornado Watch	SPC	Chicot	5 hr
May 16, 11:41 PM CDT	Mesoscale Discussion	SPC	Tishomingo	94 min
May 17, 12:55 AM CDT	Severe Thunderstorm Watch	SPC	Itawamba, Monroe, Prentiss, Tishomingo	4 hr
May 17, 2:37 AM CDT	Mesoscale Discussion	SPC	Monroe	53 min
May 17, 5:42 AM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Itawamba, Lafayette, Lee, Marshall and 7 more	63 min
May 17, 6:37 AM CDT	Mesoscale Discussion	SPC	Attala, Calhoun, Carroll, Chickasaw, Choctaw, Claiborne and 18 more	83 min
May 17, 7:48 AM CDT	Mesoscale Discussion	SPC	Attala, Calhoun, Carroll, Chickasaw, Choctaw, Claiborne and 33 more	57 min
May 17, 9:20 AM CDT	Tornado Watch	SPC	Adams, Amite, Attala, Chickasaw, Choctaw, Claiborne and 42 more	6 hr
May 17, 1:50 PM CDT	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Clarke, Copiah, Covington and 29 more	115 min
May 17, 3:00 PM CDT	Tornado Watch	SPC	Adams, Amite, Claiborne, Clarke, Copiah, Covington and 28 more	5 hr
May 17, 6:04 PM CDT	Mesoscale Discussion	SPC	Amite, Clarke, Copiah, Covington, Forrest, Greene and 18 more	116 min

Nearby

Mesoscale Discussions in Mississippi, 2003 Mesoscale Discussions in Arkansas, 2003 Every mesoscale discussion in 2003

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.