Alert archive / Iowa / Mesoscale Discussions in 2007

Mesoscale Discussion 1667

August 6, 200748 counties in Iowa; 31 counties in Nebraska; 16 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 6, 2007, 7:24 PM CDT for 48 counties in Iowa; 31 counties in Nebraska; 16 counties in South Dakota. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Aug 6, 2007, 7:24 PM CDT (00:24 UTC)
Expired
Aug 6, 2007, 9:00 PM CDT
In force
96 min
Issued by
the Storm Prediction Center
All 95 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Dickinson County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Jasper County, IA, Kossuth County, IA, Lyon County, IA, Madison County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Polk County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Story County, IA, Union County, IA, Warren County, IA, Webster County, IA, Woodbury County, IA, Wright County, IA, Antelope County, NE, Boone County, NE, Boyd County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Garfield County, NE, Greeley County, NE, Holt County, NE, Knox County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Rock County, NE, Sarpy County, NE, Saunders County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Wheeler County, NE, Aurora County, SD, Bon Homme County, SD, Brule County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Lincoln County, SD, McCook County, SD, Tripp County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 0.4 hours before the alert went out and 115 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 2007-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2407 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 2007-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 114 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
2407 J/kg
Mixed-layer CIN
-43 J/kg
Mixed-layer LCL
1157 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
114 m²/s²
0-3 km storm-relative helicity
362 m²/s²
Significant tornado parameter
2.8
Supercell composite
22.6

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
Aug 6, 10:28 PM CDTMesoscale DiscussionSPCAdair, Audubon, Carroll, Cass, Crawford, Fremont and 10 more3 hr
Aug 7, 1:58 PM CDTMesoscale DiscussionSPCAdams, Appanoose, Cedar, Clarke, Clinton, Davis and 29 more2 hr
Aug 7, 4:45 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Cass, Cedar, Clarke and 32 more6 hr
Aug 7, 1:46 AM CDTMesoscale DiscussionSPCAdams, Buffalo, Clay, Franklin, Hall, Harlan and 3 more89 min
Aug 7, 2:24 PM CDTMesoscale DiscussionSPCDawes, Sioux2 hr
Aug 7, 2:59 PM CDTSevere Thunderstorm WatchSPCBennett, Butte, Custer, Fall River, Haakon, Harding and 6 more7 hr
Aug 7, 6:30 PM CDTMesoscale DiscussionSPCBennett, Butte, Custer, Fall River, Haakon, Harding and 7 more90 min

Nearby

Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Nebraska, 2007Mesoscale Discussions in South Dakota, 2007Every mesoscale discussion in 2007

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.