Alert archive / Arkansas / Mesoscale Discussions in 2009

Mesoscale Discussion 667

May 2, 20094 states

The Storm Prediction Center issued this mesoscale discussion at May 2, 2009, 9:23 AM CDT for 4 states. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: May 2, 2009, 9:23 AM CDT (14:23 UTC)
Expired: May 2, 2009, 11:00 AM CDT
In force: 97 min
Issued by: the Storm Prediction Center

All 44 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Lincoln County, AR, Little River County, AR, Lonoke County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Polk County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Sevier County, AR, Yell County, AR, Bolivar County, MS, Coahoma County, MS, Washington County, MS, Choctaw County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK, Bowie County, TX, Delta County, TX, Lamar County, TX, Red River County, TX

The radar

The Western Arkansas radar (KSRX), 140 km from the middle of the area, began a volume at 14:23 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.

Tornado Watch 225May 2, 12:15 PM CDT

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 2.4 hours before the alert went out and 189 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: 1211 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 501 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.4

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 1, 9:36 PM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 34 more	84 min
May 1, 9:56 PM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Clark, Cleburne, Conway, Crawford, Faulkner and 27 more	6 hr
May 2, 1:45 AM CDT	Mesoscale Discussion	SPC	Arkansas, Clark, Cleburne, Cleveland, Conway, Crittenden and 34 more	90 min
May 2, 12:17 PM CDT	Tornado Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 19 more	7 hr
May 2, 3:47 PM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Columbia, Drew, Lafayette and 5 more	58 min
May 2, 5:25 PM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Columbia, Drew, Lafayette and 4 more	95 min
May 2, 6:03 PM CDT	Tornado Watch	SPC	Ashley, Bradley, Calhoun, Chicot, Columbia, Desha and 10 more	6 hr
May 2, 2:38 PM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Bolivar, Calhoun, Carroll, Chickasaw and 27 more	97 min
May 2, 2:55 PM CDT	Tornado Watch	SPC	Attala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 26 more	6 hr
May 2, 3:04 PM CDT	Mesoscale Discussion	SPC	Adams	26 min
May 2, 5:22 PM CDT	Mesoscale Discussion	SPC	Attala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 27 more	53 min
May 1, 7:19 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Cleveland, Coal, Comanche and 16 more	86 min
May 2, 2:58 AM CDT	Mesoscale Discussion	SPC	Beckham, Blaine, Caddo, Canadian, Cleveland, Comanche and 34 more	3 hr
May 2, 6:50 AM CDT	Mesoscale Discussion	SPC	Atoka, Coal, Haskell, Hughes, Johnston, Latimer and 10 more	3 hr
May 2, 1:24 PM CDT	Mesoscale Discussion	SPC	Bell, Blanco, Bosque, Burnet, Collin, Coryell and 31 more	66 min
May 2, 1:56 PM CDT	Tornado Watch	SPC	Bell, Bosque, Coryell, Dallas, Ellis, Falls and 18 more	4 hr
May 2, 5:10 PM CDT	Mesoscale Discussion	SPC	Harrison, Panola, Rusk	65 min
May 2, 6:49 PM CDT	Mesoscale Discussion	SPC	Camp, Cass, Franklin, Hopkins, Hunt, Kaufman and 7 more	86 min

Nearby

Mesoscale Discussions in Arkansas, 2009 Mesoscale Discussions in Oklahoma, 2009 Mesoscale Discussions in Texas, 2009 Every mesoscale discussion in 2009

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.