Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 1638

July 12, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Jul 12, 2004, 11:19 PM CDT for 4 states. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued
Jul 12, 2004, 11:19 PM CDT (04:19 UTC)
Expired
Jul 13, 2004, 1:15 AM CDT
In force
116 min
Issued by
the Storm Prediction Center
All 47 counties

Adair County, IA, Adams County, IA, Cass County, IA, Decatur County, IA, Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Brown County, KS, Doniphan County, KS, Andrew County, MO, Atchison County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Holt County, MO, Nodaway County, MO, Worth County, MO, Adams County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Washington County, NE, Webster County, NE, York County, NE

The radar

The Omaha radar (KOAX), 69 km from the middle of the area, began a volume at 04:20 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, 4.3 hours before the alert went out and 69 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 2004-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4686 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 2004-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 101 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
4686 J/kg
Mixed-layer CIN
-62 J/kg
Mixed-layer LCL
1125 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
101 m²/s²
0-3 km storm-relative helicity
194 m²/s²
Significant tornado parameter
3.2
Supercell composite
20.9

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 12, 9:15 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Boone, Buena Vista, Calhoun and 32 more7 hr
Jul 12, 9:19 PM CDTMesoscale DiscussionSPCClay, Dickinson, Emmet, Hancock, Kossuth, Lyon and 5 more116 min
Jul 12, 11:52 PM CDTMesoscale DiscussionSPCCherokee, Dickinson, Lyon, O'Brien, Osceola, Plymouth and 1 more53 min
Jul 13, 12:55 AM CDTSevere Thunderstorm WatchSPCAdair, Audubon, Benton, Black Hawk, Boone, Bremer and 52 more6 hr
Jul 13, 4:21 AM CDTMesoscale DiscussionSPCAllamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 22 more54 min
Jul 13, 10:32 AM CDTMesoscale DiscussionSPCCedar, Clinton, Delaware, Dubuque, Jackson, Johnson and 4 more118 min
Jul 13, 10:55 AM CDTTornado WatchSPCCedar, Clinton, Delaware, Dubuque, Jackson, Jones and 3 more6 hr
Jul 13, 1:39 PM CDTMesoscale DiscussionSPCCedar, Clinton, Delaware, Dubuque, Jackson, Jones and 3 more66 min
Jul 13, 2:25 PM CDTSevere Thunderstorm WatchSPCFremont, Harrison, Mills, Monona, Pottawattamie, Shelby6 hr
Jul 13, 6:34 PM CDTMesoscale DiscussionSPCDoniphan, Wyandotte116 min
Jul 12, 7:45 PM CDTMesoscale DiscussionSPCBoone, Butler, Colfax, Cuming, Dodge, Greeley and 14 more2 hr
Jul 12, 8:40 PM CDTTornado WatchSPCAdams, Buffalo, Clay, Franklin, Hall, Hamilton and 10 more5 hr
Jul 13, 3:27 PM CDTMesoscale DiscussionSPCArthur, Banner, Box Butte, Chase, Cheyenne, Deuel and 11 more3 hr
Jul 13, 4:10 PM CDTSevere Thunderstorm WatchSPCArthur, Banner, Box Butte, Chase, Cheyenne, Dawes and 10 more6 hr

Nearby

Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in Missouri, 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.