Alert archive / Montana / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 66, NWS Great Falls, MT

August 11, 2010Fergus County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Aug 11, 2010, 6:15 PM MDT for Fergus County, Montana. It was in force for 60 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 11, 2010, 6:15 PM MDT (00:15 UTC)
Expired: Aug 11, 2010, 7:15 PM MDT
In force: 60 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon

County Fergus County, MT

The radar

The Billings radar (KBLX), 164 km from the middle of the area, began a volume at 00:18 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 11, 4:50 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 0.3 hours before the alert went out and 223 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: 1592 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 2371 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -29 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

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 Aug 11, 5:45 PM MDT, 30 minutes earlier.

Area forecast discussion, Aug 11, 5:45 PM MDT, 30 minutes before

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Hazardous weather outlook, Aug 11, 5:04 PM MDT, 1 hour 11 minutes before

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In the hours before

Special weather statement, Aug 11, 5:21 PM MDT, 54 minutes before

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Special weather statement, Aug 11, 5:29 PM MDT, 46 minutes before

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Special weather statement, Aug 11, 5:31 PM MDT, 44 minutes before

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Special weather statement, Aug 11, 5:38 PM MDT, 37 minutes before

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Special weather statement, Aug 11, 5:43 PM MDT, 32 minutes before

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Special weather statement, Aug 11, 5:46 PM MDT, 29 minutes before

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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
Aug 11, 6:02 PM MDT	Special Weather Statement	TFX	Glacier	43 min
Aug 11, 6:15 PM MDT	Special Weather Statement	TFX	Broadwater	45 min
Aug 11, 6:25 PM MDT	Special Weather Statement	TFX	Hill	65 min
Aug 11, 6:28 PM MDT	Special Weather Statement	TFX	Chouteau	62 min
Aug 11, 6:37 PM MDT	Special Weather Statement	TFX	Teton	53 min
Aug 11, 7:17 PM MDT	Special Weather Statement	TFX	Liberty	43 min
Aug 11, 7:37 PM MDT	Special Weather Statement	TFX	Judith Basin	53 min
Aug 11, 7:46 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Judith Basin	29 min
Aug 11, 7:47 PM MDT	Special Weather Statement	TFX		58 min
Aug 11, 8:10 PM MDT	Special Weather Statement	TFX	Liberty	50 min
Aug 11, 8:31 PM MDT	Special Weather Statement	TFX	Chouteau	44 min
Aug 12, 2:29 PM MDT	Winter Weather Advisory	TFX		20 hr
Aug 12, 5:57 PM MDT	Special Weather Statement	TFX	Glacier	48 min

Nearby

Severe Thunderstorm Warnings in Montana, 2010 Every severe thunderstorm warning in 2010

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.