Alert archive / Montana / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 178, NWS Glasgow, MT

August 18, 2005Roosevelt County, Sheridan County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Aug 18, 2005, 1:36 AM MDT for Roosevelt County, Sheridan County, Montana. It was in force for 54 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 18, 2005, 1:36 AM MDT (07:36 UTC)
Expired
Aug 18, 2005, 2:30 AM MDT
In force
54 min
Issued by
NWS Glasgow, MT
Area
Counties, with a storm outline in the text

Counties Roosevelt County, MT, Sheridan County, MT

The radar

The Glasgow radar (KGGW), 142 km from the middle of the area, began a volume at 07:40 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, 7.6 hours before the alert went out and 140 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-pSkew-T log-p diagram, Glasgow Intl Airport, MT at 00:00Z on 2005-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 915 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Glasgow Intl Airport, MT at 00:00Z on 2005-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -30 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
915 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
1911 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
-30 m²/s²
0-3 km storm-relative helicity
30 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.4

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 Aug 17, 9:15 PM MDT, 4 hours 21 minutes earlier.

Area forecast discussion, Aug 17, 9:15 PM MDT, 4 hours 21 minutes before
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Hazardous weather outlook, Aug 17, 11:11 PM MDT, 2 hours 25 minutes before
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In the hours before

Local storm report, Aug 17, 8:03 PM MDT, 5 hours 33 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
803 PM MDT WED AUG 17 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0530 PM     HAIL             15 WSW THE PINES RECREA 47.75N 106.92W
08/16/2005  0.75 INCH        VALLEY             MT   PUBLIC

            WITTMAYER GRAZING HILL RANCH REPORTED PENNY SIZED HAIL
            COVERED THE GROUND WITH SOME QUARTER SIZED HAIL.

0540 PM     HAIL             15 SE BROCKWAY          47.14N 105.54W
08/16/2005  0.75 INCH        PRAIRIE            MT   PUBLIC

0640 PM     HAIL             10 S LINDSAY            47.07N 105.15W
08/16/2005  1.00 INCH        DAWSON             MT   TRAINED SPOTTER

            HAIL TWO INCHES DEEP ON THE GROUND

0645 PM     HAIL             THE PINES RECREATION AR 47.83N 106.62W
08/16/2005  0.88 INCH        VALLEY             MT   PUBLIC

0730 PM     TSTM WND GST     5 NNE HOYT              47.00N 104.81W
08/16/2005  59 MPH           DAWSON             MT   MESONET

0745 PM     HAIL             8 N PEERLESS            48.90N 105.83W
08/16/2005  0.75 INCH        DANIELS            MT   PUBLIC

0750 PM     HAIL             HOYT                    46.93N 104.85W
08/16/2005  0.75 INCH        DAWSON             MT   CO-OP OBSERVER

&&

BOGEL
Local storm report, Aug 17, 9:49 PM MDT, 3 hours 47 minutes before
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Local storm report, Aug 17, 9:50 PM MDT, 3 hours 46 minutes before
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Local storm report, Aug 17, 10:50 PM MDT, 2 hours 46 minutes before
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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
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      </p>
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 8:48 PM MDTSevere Thunderstorm WarningGGWSheridan45 min
Aug 17, 9:41 PM MDTSevere Thunderstorm WarningGGWSheridan58 min
Aug 18, 12:54 AM MDTSevere Thunderstorm WarningGGWDaniels, Roosevelt66 min
Aug 18, 2:32 AM MDTSevere Thunderstorm WarningGGWRichland, Roosevelt, Sheridan58 min
Aug 18, 3:33 AM MDTSevere Thunderstorm WarningGGWRoosevelt21 min
Aug 18, 4:45 AM MDTLake Wind AdvisoryGGWGarfield, McCone, Valley7 hr

Nearby

Severe Thunderstorm Warnings in Montana, 2005Every severe thunderstorm warning in 2005

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.