Alert archive / Nebraska / Mesoscale Discussions in 2015

Mesoscale Discussion 1694

August 16, 20154 counties in Nebraska; 4 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Aug 16, 2015, 5:24 PM MDT for 4 counties in Nebraska; 4 counties in Wyoming. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Aug 16, 2015, 5:24 PM MDT (23:24 UTC)
Expired
Aug 16, 2015, 7:30 PM MDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
20%

Counties Banner County, NE, Box Butte County, NE, Scotts Bluff County, NE, Sioux County, NE, Albany County, WY, Goshen County, WY, Laramie County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 100 km from the middle of the area, began a volume at 23:27 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

Denver, CO (KDEN), launched 12:00Z, 11.4 hours before the alert went out and 272 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, Denver, CO at 12:00Z on 2015-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Denver, CO at 12:00Z on 2015-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 square meters per square second.1939Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2198 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
90 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 15, 6:01 PM MDTMesoscale DiscussionSPCArthur, Boyd, Brown, Cherry, Garden, Grant and 7 more89 min
Aug 16, 12:08 PM MDTMesoscale DiscussionSPCKimball3 hr
Aug 16, 1:42 PM MDTMesoscale DiscussionSPCAdams, Boone, Buffalo, Dawson, Franklin, Frontier and 15 more2 hr
Aug 16, 3:01 PM MDTMesoscale DiscussionSPCBurt, Cedar, Cuming, Dakota, Dixon, Dodge and 3 more119 min

Nearby

Mesoscale Discussions in Nebraska, 2015Mesoscale Discussions in Wyoming, 2015Every mesoscale discussion in 2015

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.