Alert archive / Wyoming / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 35, NWS Riverton, WY

June 20, 2008Johnson County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jun 20, 2008, 1:36 PM MDT for Johnson County, Wyoming. It was in force for 39 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: Jun 20, 2008, 1:36 PM MDT (19:36 UTC)
Expired: Jun 20, 2008, 2:15 PM MDT
In force: 39 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon

County Johnson County, WY

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 7.6 hours before the alert went out and 296 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: 1914 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 26 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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Riverton, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 20, 2:27 AM MDT, 11 hours 9 minutes earlier.

Area forecast discussion, Jun 20, 2:27 AM MDT, 11 hours 9 minutes before

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Hazardous weather outlook, Jun 20, 5:00 AM MDT, 8 hours 36 minutes before

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<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>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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In the hours before

Special weather statement, Jun 20, 12:23 PM MDT, 1 hour 13 minutes before

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<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.
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      <p id="message2">
        Please try again in a few minutes.
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      <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 Riverton, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 19, 6:02 PM MDT	Flash Flood Warning	RIW	Big Horn	118 min
Jun 19, 7:01 PM MDT	Special Weather Statement	RIW	Sheridan	44 min
Jun 19, 7:23 PM MDT	Special Weather Statement	RIW	Johnson	52 min
Jun 19, 8:02 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	28 min
Jun 19, 8:11 PM MDT	Areal Flood Advisory	RIW	Big Horn	2 hr
Jun 20, 12:23 PM MDT	Special Weather Statement	RIW	Johnson	67 min
Jun 20, 2:20 PM MDT	Special Weather Statement	RIW	Johnson	55 min
Jun 20, 4:32 PM MDT	Special Weather Statement	RIW	Johnson	58 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2008 Every severe thunderstorm warning in 2008

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.