Alert archive / Iowa / Mesoscale Discussions in 2014

Mesoscale Discussion 1209

June 30, 201421 counties in Iowa; 14 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2014, 3:32 AM CDT for 21 counties in Iowa; 14 counties in Nebraska. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Jun 30, 2014, 3:32 AM CDT (08:32 UTC)
Expired: Jun 30, 2014, 4:30 AM CDT
In force: 58 min
Issued by: the Storm Prediction Center

All 35 counties

Audubon County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Cherokee County, IA, Crawford County, IA, Dallas County, IA, Greene County, IA, Guthrie County, IA, Ida County, IA, Jasper County, IA, Madison County, IA, Marion County, IA, Monona County, IA, Plymouth County, IA, Polk County, IA, Sac County, IA, Shelby County, IA, Story County, IA, Warren County, IA, Woodbury County, IA, Antelope County, NE, Boone County, NE, Burt County, NE, Cedar County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Madison County, NE, Pierce County, NE, Platte County, NE, Stanton County, NE, Thurston County, NE, Wayne County, NE, Wheeler County, NE

The radar

The Omaha radar (KOAX), 95 km from the middle of the area, began a volume at 08:33 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.

Severe Thunderstorm Watch 372Jun 30, 4:05 AM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 8.5 hours before the alert went out and 95 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: 2027 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1288 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 146 m²/s²
0-3 km storm-relative helicity: 271 m²/s²
Significant tornado parameter: 2.3
Supercell composite: 24.3

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
Jun 29, 7:50 PM CDT	Mesoscale Discussion	SPC	Buchanan, Clayton, Delaware, Dubuque, Fayette, Jackson and 2 more	85 min
Jun 29, 8:15 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Benton, Buchanan, Cedar, Chickasaw, Clayton and 14 more	7 hr
Jun 29, 9:43 PM CDT	Mesoscale Discussion	SPC	Allamakee, Buchanan, Cedar, Clayton, Clinton, Delaware and 6 more	92 min
Jun 29, 10:10 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Clarke, Dallas, Decatur and 16 more	65 min
Jun 29, 10:54 PM CDT	Tornado Watch	SPC	Clinton, Jackson	5 hr
Jun 30, 4:06 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Appanoose, Audubon, Boone, Calhoun and 42 more	10 hr
Jun 30, 7:16 AM CDT	Mesoscale Discussion	SPC	Audubon, Benton, Black Hawk, Boone, Bremer, Buchanan and 36 more	89 min
Jun 30, 9:08 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Cass, Harrison, Mills, Montgomery and 2 more	67 min
Jun 30, 9:38 AM CDT	Tornado Watch	SPC	Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 46 more	10 hr
Jun 30, 10:48 AM CDT	Mesoscale Discussion	SPC	Audubon, Calhoun, Carroll, Crawford, Greene, Guthrie and 7 more	87 min
Jun 30, 1:27 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Audubon, Benton, Black Hawk and 60 more	93 min
Jun 30, 2:03 PM CDT	Tornado Watch	SPC	Benton, Buchanan, Cedar, Clayton, Clinton, Delaware and 17 more	5 hr
Jun 30, 3:17 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Audubon, Boone, Carroll and 28 more	58 min
Jun 30, 3:25 PM CDT	Mesoscale Discussion	SPC	Allamakee, Benton, Buchanan, Cedar, Clayton, Clinton and 18 more	35 min
Jun 30, 6:28 PM CDT	Mesoscale Discussion	SPC	Benton, Cedar, Clinton, Dubuque, Iowa, Jackson and 10 more	92 min
Jun 29, 11:53 PM CDT	Mesoscale Discussion	SPC	Adams, Buffalo, Clay, Custer, Dawson, Franklin and 13 more	97 min
Jun 30, 1:02 AM CDT	Severe Thunderstorm Watch	SPC	Adams, Antelope, Blaine, Boone, Brown, Buffalo and 31 more	10 hr
Jun 30, 12:06 PM CDT	Mesoscale Discussion	SPC	Pawnee, Richardson	54 min
Jun 30, 3:52 PM CDT	Mesoscale Discussion	SPC	Gage, Johnson, Nemaha, Pawnee, Richardson	113 min

Nearby

Mesoscale Discussions in Iowa, 2014 Mesoscale Discussions in Nebraska, 2014 Every mesoscale discussion in 2014

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.