Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 617

May 9, 2004Sedgwick County, Colorado; 9 counties in Kansas; 25 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 9, 2004, 1:42 PM MDT for Sedgwick County, Colorado; 9 counties in Kansas; 25 counties in Nebraska. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
May 9, 2004, 1:42 PM MDT (19:42 UTC)
Expired
May 9, 2004, 4:15 PM MDT
In force
3 hr
Issued by
the Storm Prediction Center
All 35 counties

Sedgwick County, CO, Cheyenne County, KS, Decatur County, KS, Greeley County, KS, Logan County, KS, Rawlins County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Wichita County, KS, Arthur County, NE, Blaine County, NE, Brown County, NE, Chase County, NE, Cherry County, NE, Custer County, NE, Dawson County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Red Willow County, NE, Rock County, NE, Thomas County, NE

The radar

The North Platte radar (KLNX), 124 km from the middle of the area, began a volume at 19:45 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 7.7 hours before the alert went out and 42 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-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 12:00Z on 2004-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 639 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 12:00Z on 2004-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 191 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
639 J/kg
Mixed-layer CIN
-440 J/kg
Mixed-layer LCL
1809 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
191 m²/s²
0-3 km storm-relative helicity
240 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.

IssuedProductOfficeCountiesLasted
May 8, 7:25 PM MDTSevere Thunderstorm WatchSPCBrown, Clay, Cloud, Ellis, Jewell, Lincoln and 10 more6 hr
May 8, 9:44 PM MDTMesoscale DiscussionSPCBrown, Cloud, Jewell, Marshall, Mitchell, Nemaha and 5 more2 hr
May 9, 12:22 AM MDTMesoscale DiscussionSPCAtchison, Barton, Brown, Clay, Cloud, Dickinson and 27 more23 min
May 9, 2:07 PM MDTMesoscale DiscussionSPCMorton, Stevens2 hr
May 9, 2:30 PM MDTSevere Thunderstorm WatchSPCDecatur, Gove, Graham, Logan, Norton, Phillips and 7 more6 hr
May 8, 6:54 PM MDTMesoscale DiscussionSPCButler, Cass, Clay, Dodge, Douglas, Fillmore and 20 more2 hr
May 8, 8:17 PM MDTMesoscale DiscussionSPCBoyd88 min
May 9, 4:38 PM MDTMesoscale DiscussionSPCCedar2 hr
May 9, 5:12 PM MDTMesoscale DiscussionSPCAdams, Antelope, Blaine, Boone, Buffalo, Butler and 37 more2 hr

Nearby

Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in Kansas, 2004Mesoscale Discussions in Colorado, 2004Every mesoscale discussion in 2004

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.