Alert archive / Nebraska / Mesoscale Discussions in 2003

Mesoscale Discussion 1691

July 7, 20037 counties in Iowa; 57 counties in Nebraska; Bon Homme County, Clay County, Union County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 7, 2003, 10:15 PM CDT for 7 counties in Iowa; 57 counties in Nebraska; Bon Homme County, Clay County, Union County, South Dakota. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Jul 7, 2003, 10:15 PM CDT (03:15 UTC)
Expired
Jul 8, 2003, 12:45 AM CDT
In force
3 hr
Issued by
the Storm Prediction Center
All 67 counties

Crawford County, IA, Harrison County, IA, Ida County, IA, Monona County, IA, Plymouth County, IA, Pottawattamie County, IA, Woodbury County, IA, Adams County, NE, Antelope County, NE, Blaine County, NE, Boone County, NE, Boyd County, NE, Brown County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Cedar County, NE, Cherry County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dakota County, NE, Dawson County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Holt County, NE, Howard County, NE, Kearney County, NE, Keya Paha County, NE, Knox County, NE, Lancaster County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Rock County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thurston County, NE, Valley County, NE, Washington County, NE, Wayne County, NE, Wheeler County, NE, York County, NE, Bon Homme County, SD, Clay County, SD, Union County, SD

The radar

The North Platte radar (KLNX), 171 km from the middle of the area, began a volume at 03:16 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.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.3 hours before the alert went out and 190 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, Omaha, NE at 00:00Z on 2003-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4419 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, Omaha, NE at 00:00Z on 2003-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 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
4419 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
1109 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
173 m²/s²
Significant tornado parameter
3.2
Supercell composite
22.5

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
Jul 7, 7:16 PM CDTMesoscale DiscussionSPCAdair, Audubon, Benton, Cass, Cedar, Clinton and 20 more3 hr
Jul 7, 10:20 PM CDTSevere Thunderstorm WatchSPCCherokee, Crawford, Fremont, Harrison, Ida, Mills and 4 more7 hr
Jul 7, 11:25 PM CDTMesoscale DiscussionSPCClay, Dickinson, Emmet, Kossuth, Lyon, O'Brien and 3 more2 hr
Jul 7, 11:40 PM CDTSevere Thunderstorm WatchSPCClay, Dickinson, Lyon, O'Brien, Osceola, Sioux5 hr
Jul 8, 1:34 AM CDTMesoscale DiscussionSPCCherokee, Crawford, Fremont, Harrison, Ida, Mills and 5 more116 min
Jul 8, 2:52 AM CDTMesoscale DiscussionSPCBenton, Black Hawk, Boone, Bremer, Buchanan, Buena Vista and 49 more113 min
Jul 8, 8:50 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Boone, Cass and 32 more115 min
Jul 8, 9:50 AM CDTSevere Thunderstorm WatchSPCAppanoose, Benton, Black Hawk, Buchanan, Cedar, Clinton and 33 more5 hr
Jul 8, 12:59 PM CDTMesoscale DiscussionSPCBenton, Black Hawk, Buchanan, Cedar, Clinton, Delaware and 17 more91 min
Jul 8, 1:45 PM CDTTornado WatchSPCCedar, Clinton, Des Moines, Henry, Jackson, Johnson and 7 more5 hr
Jul 8, 3:40 PM CDTMesoscale DiscussionSPCDes Moines, Henry, Lee95 min
Jul 8, 5:13 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 19 more92 min
Jul 8, 6:15 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 22 more5 hr
Jul 8, 6:46 PM CDTMesoscale DiscussionSPCAppanoose, Davis, Decatur, Lee, Ringgold, Taylor and 2 more3 hr
Jul 7, 7:48 PM CDTMesoscale DiscussionSPCArthur, Box Butte, Chase, Cheyenne, Deuel, Dundy and 14 more117 min
Jul 8, 2:36 PM CDTMesoscale DiscussionSPCBox Butte, Dawes, Sioux84 min
Jul 8, 10:44 AM CDTMesoscale DiscussionSPCAurora, Beadle, Brown, Brule, Buffalo, Clark and 28 more91 min
Jul 8, 3:05 PM CDTTornado WatchSPCBennett, Butte, Custer, Fall River, Harding, Jackson and 5 more7 hr
Jul 8, 5:38 PM CDTMesoscale DiscussionSPCBennett, Butte, Custer, Fall River, Harding, Lawrence and 4 more67 min

Nearby

Mesoscale Discussions in Nebraska, 2003Mesoscale Discussions in Iowa, 2003Mesoscale Discussions in South Dakota, 2003Every mesoscale discussion in 2003

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.