Alert archive / Arkansas / Mesoscale Discussions in 2008

Mesoscale Discussion 817

May 7, 20084 states

The Storm Prediction Center issued this mesoscale discussion at May 7, 2008, 10:28 PM CDT for 4 states. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: May 7, 2008, 10:28 PM CDT (03:28 UTC)
Expired: May 8, 2008, 12:00 AM CDT
In force: 92 min
Issued by: the Storm Prediction Center

All 72 counties

Arkansas County, AR, Ashley County, AR, Baxter County, AR, Boone County, AR, Bradley County, AR, Calhoun County, AR, Carroll County, AR, Chicot County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lincoln County, AR, Lonoke County, AR, Marion County, AR, Monroe County, AR, Newton County, AR, Ouachita County, AR, Perry County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Union County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia 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, West Carroll Parish, LA, Winn Parish, LA, Adams County, MS, Angelina County, TX, Sabine County, TX, San Augustine County, TX, Trinity County, TX

The radar

The Little Rock radar (KLZK), 145 km from the middle of the area, began a volume at 03:31 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

Jackson, MS (KJAN), launched 00:00Z, 3.5 hours before the alert went out and 327 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2287 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 219 m²/s²
0-3 km storm-relative helicity: 261 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
May 7, 9:35 PM CDT	Tornado Watch	SPC	Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 36 more	5 hr
May 7, 11:49 PM CDT	Mesoscale Discussion	SPC	Ashley, Chicot	116 min
May 8, 7:48 AM CDT	Mesoscale Discussion	SPC	Attala, Calhoun, Carroll, Chickasaw, Choctaw, Clay and 21 more	87 min
May 8, 8:04 AM CDT	Tornado Watch	SPC	Alcorn, Attala, Calhoun, Carroll, Chickasaw, Choctaw and 22 more	6 hr
May 8, 10:07 AM CDT	Mesoscale Discussion	SPC	Alcorn, Attala, Calhoun, Carroll, Chickasaw, Choctaw and 23 more	83 min
May 8, 12:13 PM CDT	Mesoscale Discussion	SPC	Kemper, Lauderdale, Neshoba, Newton, Noxubee	92 min
May 8, 12:40 PM CDT	Tornado Watch	SPC	Clarke, Covington, Jasper, Jones, Kemper, Lauderdale and 6 more	5 hr
May 7, 8:21 PM CDT	Mesoscale Discussion	SPC	Brazos, Falls, Grimes, Leon, Madison, Milam and 2 more	54 min
May 8, 1:27 PM CDT	Mesoscale Discussion	SPC	Ochiltree	63 min

Nearby

Mesoscale Discussions in Arkansas, 2008 Mesoscale Discussions in Louisiana, 2008 Mesoscale Discussions in Texas, 2008 Every mesoscale discussion in 2008

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.