Alert archive / Nebraska / Mesoscale Discussions in 2018

Mesoscale Discussion 972

July 1, 20184 counties in Iowa; 16 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 1, 2018, 12:48 AM CDT for 4 counties in Iowa; 16 counties in Nebraska. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Jul 1, 2018, 12:48 AM CDT (05:48 UTC)
Expired: Jul 1, 2018, 2:45 AM CDT
In force: 117 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Harrison County, IA, Mills County, IA, Pottawattamie County, IA, Shelby County, IA, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Dodge County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Otoe County, NE, Pawnee County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 45 km from the middle of the area, began a volume at 05:52 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 nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 5.8 hours before the alert went out and 45 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: 2827 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 801 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 194 m²/s²
Significant tornado parameter: 2.5
Supercell composite: 15.5

Open this sounding in Storm Lab

The text

As transmitted.

<!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 30, 7:15 PM CDT	Mesoscale Discussion	SPC	Benton, Cedar, Clinton, Iowa, Jackson, Jasper and 11 more	90 min
Jun 30, 8:05 PM CDT	Mesoscale Discussion	SPC	Allamakee, Chickasaw, Clayton, Fayette, Winneshiek	85 min
Jun 30, 8:55 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Cass, Fremont, Harrison and 8 more	95 min
Jun 30, 8:18 PM CDT	Mesoscale Discussion	SPC	Dundy	117 min

Nearby

Mesoscale Discussions in Nebraska, 2018 Mesoscale Discussions in Iowa, 2018 Every mesoscale discussion in 2018

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.