Alert archive / Arkansas / Mesoscale Discussions in 2007

Mesoscale Discussion 233

March 1, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Mar 1, 2007, 5:23 AM CST for 4 states. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Mar 1, 2007, 5:23 AM CST (11:23 UTC)
Expired: Mar 1, 2007, 7:00 AM CST
In force: 97 min
Issued by: the Storm Prediction Center

All 73 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Jefferson County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Phillips County, AR, Pike County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Bolivar County, MS, Issaquena County, MS, Washington County, MS, Anderson County, TX, Angelina County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Gregg County, TX, Harrison County, TX, Houston County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Upshur County, TX

The radar

The Shreveport radar (KSHV), 95 km from the middle of the area, began a volume at 11:23 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.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 11.4 hours before the alert went out and 314 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: 350 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 540 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 198 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.0

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 1, 12:12 AM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Baxter, Bradley, Chicot, Clay and 36 more	2 hr
Mar 1, 1:32 AM CST	Tornado Watch	SPC	Benton, Boone, Carroll, Crawford, Franklin, Johnson and 7 more	6 hr
Mar 1, 3:35 AM CST	Mesoscale Discussion	SPC	Baxter, Clay, Cleburne, Conway, Craighead, Cross and 18 more	55 min
Mar 1, 3:58 AM CST	Tornado Watch	SPC	Baxter, Clay, Cleburne, Conway, Craighead, Faulkner and 18 more	8 hr
Mar 1, 6:17 AM CST	Tornado Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 22 more	7 hr
Mar 1, 6:54 AM CST	Mesoscale Discussion	SPC	Crittenden, Cross, Lee, Phillips, St. Francis	66 min
Mar 1, 7:28 AM CST	Tornado Watch PDS	SPC	Crittenden, Cross, Lee, Mississippi, Phillips, St. Francis	12 hr
Mar 1, 5:22 PM CST	Mesoscale Discussion	SPC	Saint Bernard	83 min
Mar 1, 1:05 AM CST	Severe Thunderstorm Watch	SPC	Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more	7 hr
Mar 1, 4:18 AM CST	Mesoscale Discussion	SPC	Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 17 more	117 min
Mar 1, 10:33 AM CST	Mesoscale Discussion	SPC	Amite, Attala, Calhoun, Carroll, Chickasaw, Choctaw and 43 more	117 min
Mar 1, 11:39 AM CST	Mesoscale Discussion	SPC	George, Greene, Perry	2 hr
Mar 1, 2:41 PM CST	Mesoscale Discussion	SPC	Clarke, Greene, Wayne	94 min
Mar 1, 3:03 AM CST	Mesoscale Discussion	SPC	Bell, Blanco, Burnet, Coryell, Gillespie, Kerr and 6 more	27 min

Nearby

Mesoscale Discussions in Arkansas, 2007 Mesoscale Discussions in Louisiana, 2007 Mesoscale Discussions in Texas, 2007 Every mesoscale discussion in 2007

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.