Alert archive / Wyoming / Winter Storm Warnings in 2013

Winter Storm Warning 6, NWS Riverton, WY

April 8, 20135 counties in Wyoming

NWS Riverton, WY issued this winter storm warning at Apr 8, 2013, 2:03 AM MDT for 5 counties in Wyoming. It took effect at Apr 8, 2013, 9:00 AM MDT. It was in force for 39 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 8, 2013, 2:03 AM MDT (08:03 UTC)
In effect from: Apr 8, 2013, 9:00 AM MDT
Expired: Apr 10, 2013, 12:00 AM MDT
In force: 39 hr
Issued by: NWS Riverton, WY

Counties Fremont County, WY, Lincoln County, WY, Natrona County, WY, Sublette County, WY, Sweetwater County, WY

The radar

The Riverton/Lander radar (KRIW), 71 km from the middle of the area, began a volume at 08:05 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

Salt Lake City I, UT (KSLC), launched 00:00Z, 8.1 hours before the alert went out and 312 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: 68 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 2822 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 166 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter storm 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 winter storm warning went out at Apr 7, 3:32 PM MDT, 10 hours 31 minutes earlier.

Area forecast discussion, Apr 7, 3:32 PM MDT, 10 hours 31 minutes before

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Hazardous weather outlook, Apr 7, 5:00 AM MDT, 21 hours 3 minutes before

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  <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 Riverton, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 8, 2:03 AM MDT	Winter Weather Advisory	RIW	Big Horn, Fremont, Hot Springs, Johnson, Natrona, Sublette and 2 more	46 hr

Nearby

Winter Storm Warnings in Wyoming, 2013 Every winter storm warning 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.