Alert archive / Wyoming / Winter Storm Watches in 2012

Winter Storm Watch 2, NWS Riverton, WY

January 20, 20125 counties in Wyoming

NWS Riverton, WY issued this winter storm watch at Jan 20, 2012, 2:22 AM MST for 5 counties in Wyoming. It took effect at Jan 20, 2012, 11:00 PM MST. It was in force for .

The area

The counties it named.

The facts

Issued: Jan 20, 2012, 2:22 AM MST (09:22 UTC)
In effect from: Jan 20, 2012, 11:00 PM MST
Expired: Jan 20, 2012, 2:36 PM MST
In force
Issued by: NWS Riverton, WY

Counties Fremont County, WY, Lincoln County, WY, Park County, WY, Sublette County, WY, Teton County, WY

The radar

The Riverton/Lander radar (KRIW), 116 km from the middle of the area, began a volume at 09:20 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

Riverton, WY (KRIW), launched 00:00Z, 9.4 hours before the alert went out and 122 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: 2167 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 229 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 winter storm watch 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 watch went out at Jan 19, 11:46 PM MST, 2 hours 36 minutes earlier.

Area forecast discussion, Jan 19, 11:46 PM MST, 2 hours 36 minutes before

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Hazardous weather outlook, Jan 19, 11:44 PM MST, 2 hours 38 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 Riverton, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 20, 9:54 AM MST	Winter Weather Advisory	RIW	Fremont, Hot Springs, Lincoln, Park, Sublette, Sweetwater	37 hr
Jan 20, 1:42 PM MST	High Wind Watch	RIW	Fremont, Natrona, Sweetwater	6 hr
Jan 20, 2:36 PM MST	Winter Storm Warning	RIW	Fremont, Lincoln, Park, Sublette, Teton	32 hr

Nearby

Winter Storm Watches in Wyoming, 2012 Every winter storm watch in 2012

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.