Alert archive / Arkansas / Mesoscale Discussions in 2005

Mesoscale Discussion 77

January 12, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Jan 12, 2005, 10:16 PM CST for 4 states. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Jan 12, 2005, 10:16 PM CST (04:16 UTC)
Expired: Jan 12, 2005, 11:15 PM CST
In force: 59 min
Issued by: the Storm Prediction Center

All 66 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Clay County, AR, Cleburne County, AR, Cleveland County, AR, Columbia County, AR, Conway County, AR, Craighead County, AR, Cross County, AR, Dallas County, AR, Drew County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hempstead County, AR, Hot Spring County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Lafayette County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Miller County, AR, Monroe County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Poinsett County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Searcy County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Union County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Dunklin County, MO, Nacogdoches County, TX, Panola County, TX, Shelby County, TX

The radar

The Little Rock radar (KLZK), 68 km from the middle of the area, began a volume at 04:16 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.

Severe Thunderstorm Watch 7Jan 12, 10:50 PM CST

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 4.3 hours before the alert went out and 228 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: 242 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 1106 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 262 m²/s²
0-3 km storm-relative helicity: 342 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.2

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
Jan 12, 6:02 PM CST	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 9 more	88 min
Jan 12, 7:52 PM CST	Mesoscale Discussion	SPC	Clark, Conway, Franklin, Garland, Hempstead, Howard and 15 more	83 min
Jan 12, 9:28 PM CST	Mesoscale Discussion	SPC	Clay, Cleburne, Craighead, Fulton, Greene, Independence and 5 more	32 min
Jan 12, 10:50 PM CST	Severe Thunderstorm Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleburne and 27 more	5 hr
Jan 13, 2:25 AM CST	Tornado Watch	SPC	Chicot	7 hr
Jan 13, 4:36 AM CST	Mesoscale Discussion	SPC	Acadia, Concordia, East Baton Rouge, East Feliciana, Iberville, Lafayette and 9 more	84 min
Jan 13, 5:45 AM CST	Tornado Watch	SPC	Saint Helena, Washington	5 hr
Jan 12, 6:50 PM CST	Mesoscale Discussion	SPC	Adair, Caldwell, Carroll, Cass, Jackson, Lafayette and 6 more	4 hr
Jan 12, 9:45 PM CST	Severe Thunderstorm Watch	SPC	Bollinger, Butler, Cape Girardeau, Carter, Iron, Jefferson and 15 more	5 hr
Jan 13, 1:02 AM CST	Mesoscale Discussion	SPC	Bollinger, Butler, Cape Girardeau, Madison, Perry, Scott and 2 more	88 min
Jan 13, 6:51 AM CST	Mesoscale Discussion	SPC	Adair, Audrain, Barton, Bates, Benton, Boone and 51 more	4 hr
Jan 13, 11:58 AM CST	Mesoscale Discussion	SPC	Crawford, Franklin, Jefferson, Saint Charles, Sainte Genevieve, Saint Louis and 2 more	5 hr

Nearby

Mesoscale Discussions in Arkansas, 2005 Mesoscale Discussions in Louisiana, 2005 Mesoscale Discussions in Texas, 2005 Every mesoscale discussion in 2005

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.