Alert archive / Montana / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 69, NWS Glasgow, MT

August 8, 2003Garfield County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Aug 8, 2003, 9:16 PM MDT for Garfield County, Montana. It was in force for 59 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 8, 2003, 9:16 PM MDT (03:16 UTC)
Expired: Aug 8, 2003, 10:15 PM MDT
In force: 59 min
Issued by: NWS Glasgow, MT
Area: Counties, with a storm outline in the text

County Garfield County, MT

The radar

The Glasgow radar (KGGW), 107 km from the middle of the area, began a volume at 03:19 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 8, 4:35 PM MDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 3.3 hours before the alert went out and 109 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: 2301 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 2167 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 296 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 20.1

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 8, 8:52 PM MDT, 24 minutes earlier.

Area forecast discussion, Aug 8, 8:52 PM MDT, 24 minutes before

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Hazardous weather outlook, Aug 8, 4:07 PM MDT, 5 hours 9 minutes before

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In the hours before

Special weather statement, Aug 8, 8:30 PM MDT, 46 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 10:42 AM MDT	Severe Thunderstorm Warning	GGW	Phillips, Valley	63 min
Aug 9, 11:53 AM MDT	Severe Thunderstorm Warning	GGW	Valley	52 min
Aug 9, 2:05 PM MDT	Severe Thunderstorm Warning	GGW	Sheridan	55 min
Aug 9, 3:00 PM MDT	Severe Thunderstorm Warning	GGW	Sheridan	60 min

Nearby

Severe Thunderstorm Warnings in Montana, 2003 Every severe thunderstorm warning in 2003

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.