Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1984

August 15, 20117 counties in Kansas; 15 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Aug 15, 2011, 1:26 AM CDT for 7 counties in Kansas; 15 counties in Nebraska. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Aug 15, 2011, 1:26 AM CDT (06:26 UTC)
Expired: Aug 15, 2011, 4:30 AM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 22 counties

Cloud County, KS, Jewell County, KS, Mitchell County, KS, Osborne County, KS, Republic County, KS, Smith County, KS, Washington County, KS, Boone County, NE, Clay County, NE, Fillmore County, NE, Gage County, NE, Hamilton County, NE, Jefferson County, NE, Lancaster County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Polk County, NE, Saline County, NE, Seward County, NE, Thayer County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 79 km from the middle of the area, began a volume at 06:28 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 6.4 hours before the alert went out and 209 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: 1461 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 1398 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 125 m²/s²
0-3 km storm-relative helicity: 416 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 21.7

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
Aug 14, 7:44 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Rawlins, Sheridan, Sherman, Thomas	91 min

Nearby

Mesoscale Discussions in Nebraska, 2011 Mesoscale Discussions in Kansas, 2011 Every mesoscale discussion in 2011

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.