Alert archive / Arkansas / Mesoscale Discussions in 2005

Mesoscale Discussion 182

February 20, 200533 counties in Arkansas; Oregon County, Missouri; Adair County, Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Feb 20, 2005, 8:51 PM CST for 33 counties in Arkansas; Oregon County, Missouri; Adair County, Oklahoma. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Feb 20, 2005, 8:51 PM CST (02:51 UTC)
Expired: Feb 20, 2005, 10:45 PM CST
In force: 114 min
Issued by: the Storm Prediction Center

All 35 counties

Baxter County, AR, Boone County, AR, Carroll County, AR, Cleburne County, AR, Conway County, AR, Crawford County, AR, Faulkner County, AR, Franklin County, AR, Fulton County, AR, Garland County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Polk County, AR, Pope County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, White County, AR, Yell County, AR, Oregon County, MO, Adair County, OK

The radar

The Western Arkansas radar (KSRX), 98 km from the middle of the area, began a volume at 02:51 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

Springfield, MO (KSGF), launched 00:00Z, 2.9 hours before the alert went out and 155 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: 424 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1413 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.3

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
Feb 20, 9:10 PM CST	Severe Thunderstorm Watch	SPC	Baxter, Benton, Boone, Carroll, Cleburne, Conway and 29 more	6 hr
Feb 20, 11:22 PM CST	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Clay, Cleburne and 42 more	113 min
Feb 21, 12:30 AM CST	Severe Thunderstorm Watch	SPC	Clay, Craighead, Crittenden, Cross, Greene, Jackson and 8 more	6 hr
Feb 21, 2:10 AM CST	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Clay, Cleburne and 43 more	95 min
Feb 21, 2:30 AM CST	Severe Thunderstorm Watch	SPC	Baxter, Boone, Cleburne, Conway, Fulton, Independence and 11 more	4 hr
Feb 21, 4:29 AM CST	Mesoscale Discussion	SPC	Baxter, Boone, Clay, Cleburne, Conway, Craighead and 16 more	2 hr
Feb 21, 5:45 AM CST	Severe Thunderstorm Watch	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more	3 hr
Feb 21, 7:50 AM CST	Mesoscale Discussion	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more	55 min
Feb 21, 3:58 PM CST	Mesoscale Discussion	SPC	Arkansas, Desha, Drew, Jefferson, Lincoln, Phillips	92 min

Nearby

Mesoscale Discussions in Arkansas, 2005 Mesoscale Discussions in Missouri, 2005 Mesoscale Discussions in Oklahoma, 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.