Alert archive / Montana / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 55, NWS Glasgow, MT

July 30, 2004Dawson County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jul 30, 2004, 10:55 PM MDT for Dawson County, Montana. It was in force for 65 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 30, 2004, 10:55 PM MDT (04:55 UTC)
Expired: Jul 31, 2004, 12:00 AM MDT
In force: 65 min
Issued by: NWS Glasgow, MT
Area: Counties, with a storm outline in the text

County Dawson County, MT

The radar

The Glasgow radar (KGGW), 166 km from the middle of the area, began a volume at 04:58 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 00:00Z, 4.9 hours before the alert went out and 166 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: 104 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 2490 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 144 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 Glasgow, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 30, 8:35 PM MDT, 2 hours 20 minutes earlier.

Area forecast discussion, Jul 30, 8:35 PM MDT, 2 hours 20 minutes before

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In the hours before

Local storm report, Jul 30, 10:16 PM MDT, 39 minutes before

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<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
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      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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The office that day

Everything else NWS Glasgow, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 30, 6:57 PM MDT	Severe Thunderstorm Warning	GGW	Phillips	63 min
Jul 30, 7:19 PM MDT	Severe Thunderstorm Warning	GGW	Valley	56 min
Jul 30, 7:20 PM MDT	Severe Thunderstorm Warning	GGW	Valley	55 min
Jul 30, 8:13 PM MDT	Severe Thunderstorm Warning	GGW	Valley	62 min
Jul 30, 8:46 PM MDT	Severe Thunderstorm Warning	GGW	McCone	59 min
Jul 30, 9:04 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	56 min
Jul 30, 11:33 PM MDT	Severe Thunderstorm Warning	GGW	Wibaux	57 min

Nearby

Severe Thunderstorm Warnings in Montana, 2004 Every severe thunderstorm warning in 2004

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.