Alert archive / Montana / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 28, NWS Glasgow, MT

June 29, 2011McCone County, Roosevelt County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jun 29, 2011, 1:42 AM MDT for McCone County, Roosevelt County, Montana. It was in force for 33 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: Jun 29, 2011, 1:42 AM MDT (07:42 UTC)
Expired: Jun 29, 2011, 2:15 AM MDT
In force: 33 min
Issued by: NWS Glasgow, MT
Area: Storm-based polygon

Counties McCone County, MT, Roosevelt County, MT

The radar

The Glasgow radar (KGGW), 94 km from the middle of the area, began a volume at 07:42 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, 7.7 hours before the alert went out and 393 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: 924 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 2940 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 125 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.8

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 Jun 28, 8:40 PM MDT, 5 hours 2 minutes earlier.

Area forecast discussion, Jun 28, 8:40 PM MDT, 5 hours 2 minutes before

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In the hours before

Special weather statement, Jun 28, 10:09 PM MDT, 3 hours 33 minutes before

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Special weather statement, Jun 29, 1:04 AM MDT, 38 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
Jun 28, 10:09 PM MDT	Special Weather Statement	GGW	Phillips	66 min
Jun 29, 1:04 AM MDT	Special Weather Statement	GGW	McCone	41 min
Jun 29, 5:20 PM MDT	Special Weather Statement	GGW	Phillips	55 min
Jun 29, 5:33 PM MDT	Special Weather Statement	GGW		57 min

Nearby

Severe Thunderstorm Warnings in Montana, 2011 Every severe thunderstorm warning in 2011

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.