Alert archive / South Dakota / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 82, NWS Aberdeen, SD

July 4, 2015Dewey County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 4, 2015, 6:28 PM MDT for Dewey County, South Dakota. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 4, 2015, 6:28 PM MDT (00:28 UTC)
Expired: Jul 4, 2015, 7:15 PM MDT
In force: 47 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Dewey County, SD

The radar

The Bismarck radar (KBIS), 180 km from the middle of the area, began a volume at 00:29 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 0.5 hours before the alert went out and 180 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: 2452 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 1727 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 8.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Local storm report, Jul 4, 6:08 PM MDT, 20 minutes before

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Local storm report, Jul 4, 6:14 PM MDT, 14 minutes before

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  <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.
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      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

Everything else NWS Aberdeen, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 4, 6:57 PM MDT	Severe Thunderstorm Warning	ABR	Dewey	48 min
Jul 4, 7:33 PM MDT	Severe Thunderstorm Warning	ABR	Dewey, Stanley, Sully	42 min
Jul 4, 7:39 PM MDT	Special Weather Statement	ABR	Lyman	51 min
Jul 4, 7:44 PM MDT	Severe Thunderstorm Warning	ABR	Dewey, Stanley	46 min
Jul 4, 7:46 PM MDT	Severe Thunderstorm Warning	ABR	Hughes, Lyman	43 min
Jul 4, 8:21 PM MDT	Severe Thunderstorm Warning	ABR	Dewey, Stanley	39 min
Jul 4, 8:58 PM MDT	Severe Thunderstorm Warning	ABR	Stanley	23 min
Jul 4, 9:14 PM MDT	Special Weather Statement	ABR	Lyman	46 min
Jul 4, 9:22 PM MDT	Severe Thunderstorm Warning	ABR	Lyman	38 min
Jul 4, 9:44 PM MDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk, Potter, Walworth	31 min
Jul 4, 11:02 PM MDT	Special Weather Statement	ABR	Brown	28 min
Jul 4, 11:53 PM MDT	Special Weather Statement	ABR	Brown	52 min
Jul 5, 12:40 AM MDT	Severe Thunderstorm Warning	ABR	Brown, Faulk, Spink	50 min
Jul 5, 1:47 AM MDT	Special Weather Statement	ABR	Brown	43 min
Jul 5, 1:58 AM MDT	Severe Thunderstorm Warning	ABR	Brown	29 min
Jul 5, 2:23 AM MDT	Severe Thunderstorm Warning	ABR	Brown, Spink	37 min
Jul 5, 2:49 AM MDT	Severe Thunderstorm Warning	ABR	Brown, Spink	41 min
Jul 5, 3:49 AM MDT	Special Weather Statement	ABR	Brown	56 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2015 Every severe thunderstorm warning 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.