Alert archive / Montana / Winter Weather Advisories in 2012

Winter Weather Advisory 23, NWS Missoula, MT

March 12, 201211 counties in Montana; Clearwater County, Idaho County, Idaho

NWS Missoula, MT issued this winter weather advisory at Mar 12, 2012, 12:04 PM MDT for 11 counties in Montana; Clearwater County, Idaho County, Idaho. It took effect at Mar 12, 2012, 6:00 PM MDT. It was in force for 39 hr.

The area

The counties it named.

The facts

Issued: Mar 12, 2012, 12:04 PM MDT (18:04 UTC)
In effect from: Mar 12, 2012, 6:00 PM MDT
Expired: Mar 14, 2012, 9:00 AM MDT
In force: 39 hr
Issued by: NWS Missoula, MT

Counties Clearwater County, ID, Idaho County, ID, Deer Lodge County, MT, Flathead County, MT, Granite County, MT, Lake County, MT, Lincoln County, MT, Mineral County, MT, Missoula County, MT, Powell County, MT, Ravalli County, MT, Sanders County, MT, Silver Bow County, MT

The radar

The Missoula radar (KMSX), 22 km from the middle of the area, began a volume at 18:10 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

Great_falls, MT (KTFX), launched 12:00Z, 6.1 hours before the alert went out and 280 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: 1492 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 300 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 weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Missoula, MT wrote its last area forecast discussion before this winter weather advisory went out at Mar 12, 4:06 AM MDT, 7 hours 58 minutes earlier.

Area forecast discussion, Mar 12, 4:06 AM MDT, 7 hours 58 minutes before

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In the hours before

Local storm report, Mar 12, 6:29 AM MDT, 5 hours 35 minutes before

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Local storm report, Mar 12, 10:26 AM MDT, 1 hour 38 minutes before

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<head>
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</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.
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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 Missoula, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 12, 12:22 PM MDT	Wind Advisory	MSO	Deer Lodge, Flathead, Granite, Lake, Missoula, Powell and 3 more	30 hr
Mar 12, 3:32 AM MDT	Wind Advisory	MSO	Clearwater, Idaho	9 hr
Mar 12, 12:22 PM MDT	High Wind Warning	MSO	Clearwater, Idaho, Lemhi	32 hr

Nearby

Winter Weather Advisories in Montana, 2012 Winter Weather Advisories in Idaho, 2012 Every winter weather advisory 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.