Alert archive / Montana / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 138, NWS Great Falls, MT

August 31, 2008Cascade County, Chouteau County, Teton County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Aug 31, 2008, 12:07 AM MDT for Cascade County, Chouteau County, Teton County, Montana. It was in force for 38 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: Aug 31, 2008, 12:07 AM MDT (06:07 UTC)
Expired: Aug 31, 2008, 12:45 AM MDT
In force: 38 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon

Counties Cascade County, MT, Chouteau County, MT, Teton County, MT

The radar

The Great Falls radar (KTFX), 24 km from the middle of the area, began a volume at 06:07 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 00:00Z, 6.1 hours before the alert went out and 61 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: 3572 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: -26 m²/s²
0-3 km storm-relative helicity: 51 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 Great Falls, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 30, 10:50 PM MDT, 1 hour 17 minutes earlier.

Area forecast discussion, Aug 30, 10:50 PM MDT, 1 hour 17 minutes before

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Hazardous weather outlook, Aug 30, 8:55 PM MDT, 3 hours 12 minutes before

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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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        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 Great Falls, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 31, 12:48 AM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Liberty, Pondera, Teton	42 min
Aug 31, 3:37 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead	38 min
Aug 31, 3:49 PM MDT	Flash Flood Watch	TFX		5 hr
Aug 31, 4:01 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Judith Basin, Meagher	44 min

Nearby

Severe Thunderstorm Warnings in Montana, 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; radar from the NEXRAD Level II archive.