Alert archive / Montana / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 72, NWS Great Falls, MT

July 26, 2009Blaine County, Chouteau County, Fergus County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jul 26, 2009, 3:43 PM MDT for Blaine County, Chouteau County, Fergus County, Montana. It was in force for 47 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 26, 2009, 3:43 PM MDT (21:43 UTC)
Expired: Jul 26, 2009, 4:30 PM MDT
In force: 47 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon

Counties Blaine County, MT, Chouteau County, MT, Fergus County, MT

The radar

The Great Falls radar (KTFX), 145 km from the middle of the area, began a volume at 21:45 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 12:00Z, 9.7 hours before the alert went out and 91 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: 29 J/kg
Mixed-layer CIN: -328 J/kg
Mixed-layer LCL: 2182 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: -9 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 Great Falls, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 26, 2:51 PM MDT, 52 minutes earlier.

Area forecast discussion, Jul 26, 2:51 PM MDT, 52 minutes before

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Hazardous weather outlook, Jul 26, 4:06 AM MDT, 11 hours 37 minutes before

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In the hours before

Special weather statement, Jul 26, 3:03 PM MDT, 40 minutes before

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Special weather statement, Jul 26, 3:15 PM MDT, 28 minutes before

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Local storm report, Jul 26, 3:17 PM MDT, 26 minutes before

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Special weather statement, Jul 26, 3:18 PM MDT, 25 minutes before

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Special weather statement, Jul 26, 3:29 PM MDT, 14 minutes before

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Special weather statement, Jul 26, 3:36 PM MDT, 7 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
Jul 25, 6:48 PM MDT	Special Weather Statement	TFX	Teton	57 min
Jul 26, 1:26 PM MDT	Special Weather Statement	TFX	Fergus	49 min
Jul 26, 1:44 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	35 min
Jul 26, 2:25 PM MDT	Special Weather Statement	TFX		50 min
Jul 26, 2:51 PM MDT	Special Weather Statement	TFX	Hill	39 min
Jul 26, 3:03 PM MDT	Special Weather Statement	TFX	Beaverhead	42 min
Jul 26, 3:15 PM MDT	Special Weather Statement	TFX	Teton	45 min
Jul 26, 3:18 PM MDT	Special Weather Statement	TFX		42 min
Jul 26, 3:29 PM MDT	Special Weather Statement	TFX	Liberty	46 min
Jul 26, 3:36 PM MDT	Special Weather Statement	TFX		39 min
Jul 26, 3:40 PM MDT	Severe Thunderstorm Warning	TFX	Teton	39 min
Jul 26, 4:01 PM MDT	Special Weather Statement	TFX	Lewis and Clark	44 min
Jul 26, 4:30 PM MDT	Special Weather Statement	TFX	Fergus	45 min
Jul 26, 4:33 PM MDT	Special Weather Statement	TFX	Madison	42 min
Jul 26, 4:49 PM MDT	Special Weather Statement	TFX	Pondera	41 min
Jul 26, 5:21 PM MDT	Special Weather Statement	TFX	Fergus	39 min
Jul 26, 5:37 PM MDT	Special Weather Statement	TFX	Fergus	38 min
Jul 26, 5:40 PM MDT	Special Weather Statement	TFX	Cascade	35 min

Nearby

Severe Thunderstorm Warnings in Montana, 2009 Every severe thunderstorm warning in 2009

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.