Alert archive / South Dakota / Mesoscale Discussions in 2013

Mesoscale Discussion 674

May 17, 201315 counties in Nebraska; 29 counties in South Dakota; 4 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at May 17, 2013, 9:26 PM MDT for 15 counties in Nebraska; 29 counties in South Dakota; 4 counties in Wyoming. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
May 17, 2013, 9:26 PM MDT (03:26 UTC)
Expired
May 17, 2013, 10:30 PM MDT
In force
64 min
Issued by
the Storm Prediction Center
All 48 counties

Arthur County, NE, Box Butte County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Dawes County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keya Paha County, NE, McPherson County, NE, Morrill County, NE, Rock County, NE, Sheridan County, NE, Sioux County, NE, Aurora County, SD, Bennett County, SD, Brule County, SD, Buffalo County, SD, Butte County, SD, Charles Mix County, SD, Custer County, SD, Douglas County, SD, Fall River County, SD, Gregory County, SD, Haakon County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jerauld County, SD, Jones County, SD, Lawrence County, SD, Lyman County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Ziebach County, SD, Campbell County, WY, Crook County, WY, Niobrara County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 60 km from the middle of the area, began a volume at 03:29 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

Rapid City, SD (KUNR), launched 00:00Z, 3.4 hours before the alert went out and 55 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, Rapid City, SD at 00:00Z on 2013-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 514 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, Rapid City, SD at 00:00Z on 2013-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 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
514 J/kg
Mixed-layer CIN
-87 J/kg
Mixed-layer LCL
1707 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
264 m²/s²
Significant tornado parameter
0.2
Supercell composite
7.2

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
May 18, 1:09 PM MDTMesoscale DiscussionSPCArthur, Box Butte, Chase, Cheyenne, Deuel, Dundy and 14 more96 min
May 18, 1:42 PM MDTTornado WatchSPCArthur, Banner, Box Butte, Chase, Cherry, Cheyenne and 27 more8 hr
May 18, 4:15 PM MDTMesoscale DiscussionSPCArthur, Box Butte, Cheyenne, Deuel, Garden, Grant and 4 more60 min
May 18, 5:42 PM MDTMesoscale DiscussionSPCAdams, Buffalo, Clay, Custer, Franklin, Garfield and 12 more33 min
May 17, 6:28 PM MDTMesoscale DiscussionSPCBennett, Brule, Butte, Custer, Fall River, Gregory and 15 more92 min
May 17, 6:59 PM MDTSevere Thunderstorm WatchSPCAurora, Brule, Buffalo, Charles Mix, Douglas, Faulk and 10 more3 hr
May 18, 2:31 PM MDTMesoscale DiscussionSPCBennett, Brule, Buffalo, Butte, Custer, Dewey and 21 more59 min
May 18, 2:55 PM MDTSevere Thunderstorm WatchSPCBennett, Butte, Custer, Fall River, Haakon, Harding and 9 more8 hr
May 18, 4:24 PM MDTMesoscale DiscussionSPCBrown, Campbell, Corson, Dewey, Edmunds, Faulk and 10 more66 min
May 18, 4:46 PM MDTSevere Thunderstorm WatchSPCBrown, Buffalo, Campbell, Corson, Dewey, Edmunds and 12 more7 hr
May 18, 5:11 PM MDTMesoscale DiscussionSPCBrookings, Codington, Deuel, Grant, Hamlin, Kingsbury94 min

Nearby

Mesoscale Discussions in South Dakota, 2013Mesoscale Discussions in Nebraska, 2013Mesoscale Discussions in Wyoming, 2013Every mesoscale discussion in 2013

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.