Alert archive / South Dakota / High Wind Watches in 2021

High Wind Watch 8, NWS Rapid City, SD

November 15, 20215 counties in South Dakota

NWS Rapid City, SD issued this high wind watch at Nov 15, 2021, 1:31 AM MST for 5 counties in South Dakota. It took effect at Nov 16, 2021, 9:00 AM MST. It was in force for .

The area

The counties it named.

The facts

Issued: Nov 15, 2021, 1:31 AM MST (08:31 UTC)
In effect from: Nov 16, 2021, 9:00 AM MST
Expired: Nov 15, 2021, 2:25 PM MST
In force
Issued by: NWS Rapid City, SD

Counties Butte County, SD, Harding County, SD, Meade County, SD, Perkins County, SD, Ziebach County, SD

The radar

The Rapid City radar (KUDX), 109 km from the middle of the area, began a volume at 08:36 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, 8.5 hours before the alert went out and 245 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1231 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 203 m²/s²
0-3 km storm-relative helicity: 382 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Rapid City, SD wrote its last area forecast discussion before this high wind watch went out at Nov 14, 9:53 PM MST, 3 hours 38 minutes earlier.

Area forecast discussion, Nov 14, 9:53 PM MST, 3 hours 38 minutes before

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Hazardous weather outlook, Nov 14, 10:24 AM MST, 15 hours 7 minutes before

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<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.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 15, 1:46 AM MST	Fire Weather Watch	UNR	Bennett, Butte, Custer, Fall River, Haakon, Jackson and 8 more	13 hr
Nov 15, 2:25 PM MST	High Wind Warning	UNR	Butte, Harding, Meade, Pennington, Perkins, Ziebach	51 hr
Nov 15, 2:28 PM MST	Red Flag Warning	UNR	Bennett, Butte, Custer, Fall River, Haakon, Jackson and 8 more	27 hr

Nearby

High Wind Watches in South Dakota, 2021 High Wind Watches in Wyoming, 2021 Every high wind watch in 2021

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.