Alert archive / Montana / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 87, NWS Great Falls, MT

July 23, 2008Chouteau County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jul 23, 2008, 7:59 PM MDT for Chouteau County, Montana. It was in force for 39 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: Jul 23, 2008, 7:59 PM MDT (01:59 UTC)
Expired: Jul 23, 2008, 8:38 PM MDT
In force: 39 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon

County Chouteau County, MT

The nearest sounding before it

Great_falls, MT (KTFX), launched 00:00Z, 2.0 hours before the alert went out and 48 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: 2742 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 134 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 Jul 23, 5:28 PM MDT, 2 hours 31 minutes earlier.

Area forecast discussion, Jul 23, 5:28 PM MDT, 2 hours 31 minutes before

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Hazardous weather outlook, Jul 23, 5:23 AM MDT, 14 hours 36 minutes before

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  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
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  <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 Great Falls, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 23, 8:54 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Lewis and Clark	51 min
Jul 23, 9:36 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Lewis and Clark, Meagher	54 min
Jul 23, 10:19 PM MDT	Severe Thunderstorm Warning	TFX	Pondera, Teton	41 min
Jul 23, 10:25 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Judith Basin, Meagher	50 min
Jul 23, 10:32 PM MDT	Tornado Warning	TFX	Pondera	28 min
Jul 23, 10:55 PM MDT	Severe Thunderstorm Warning	TFX	Pondera, Toole	50 min
Jul 23, 11:45 PM MDT	Severe Thunderstorm Warning	TFX	Toole	30 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.