Alert archive / Montana / Winter Storm Warnings in 2011

Winter Storm Warning 3, NWS Billings, MT

February 6, 201110 counties in Montana

NWS Billings, MT issued this winter storm warning at Feb 6, 2011, 3:08 PM MST for 10 counties in Montana. It took effect at Feb 6, 2011, 11:00 PM MST. It was in force for 25 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: Feb 6, 2011, 3:08 PM MST (22:08 UTC)
In effect from: Feb 6, 2011, 11:00 PM MST
Expired: Feb 7, 2011, 11:58 PM MST
In force: 25 hr
Issued by: NWS Billings, MT

Counties Big Horn County, MT, Carbon County, MT, Golden Valley County, MT, Musselshell County, MT, Park County, MT, Rosebud County, MT, Stillwater County, MT, Sweet Grass County, MT, Treasure County, MT, Wheatland County, MT

The radar

The Billings radar (KBLX), 17 km from the middle of the area, began a volume at 22:13 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

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 10.1 hours before the alert went out and 302 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: 792 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -37 m²/s²
0-3 km storm-relative helicity: -17 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 warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Billings, MT wrote its last area forecast discussion before this winter storm warning went out at Feb 6, 2:53 PM MST, 15 minutes earlier.

Area forecast discussion, Feb 6, 2:53 PM MST, 15 minutes before

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Hazardous weather outlook, Feb 6, 2:53 PM MST, 15 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 Billings, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 5, 9:22 PM MST	Winter Weather Advisory	BYZ	Carbon, Carter, Custer, Fallon, Powder River, Rosebud and 2 more	14 hr
Feb 6, 3:08 PM MST	Winter Weather Advisory	BYZ	Carbon, Custer, Powder River, Rosebud, Stillwater, Sweet Grass	33 hr

Nearby

Winter Storm Warnings in Montana, 2011 Every winter storm warning in 2011

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.