Alert archive / Montana / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 166, NWS Billings, MT

August 29, 2011Musselshell County, Rosebud County, Yellowstone County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Aug 29, 2011, 3:41 PM MDT for Musselshell County, Rosebud County, Yellowstone County, Montana. It was in force for 51 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 29, 2011, 3:41 PM MDT (21:41 UTC)
Expired: Aug 29, 2011, 4:32 PM MDT
In force: 51 min
Issued by: NWS Billings, MT
Area: Storm-based polygon

Counties Musselshell County, MT, Rosebud County, MT, Yellowstone County, MT

The radar

The Billings radar (KBLX), 74 km from the middle of the area, began a volume at 21:41 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 29, 2:34 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 9.7 hours before the alert went out and 254 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3295 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: -13 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 Billings, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 29, 3:15 PM MDT, 26 minutes earlier.

Area forecast discussion, Aug 29, 3:15 PM MDT, 26 minutes before

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Hazardous weather outlook, Aug 29, 3:37 PM MDT, 4 minutes before

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In the hours before

Special weather statement, Aug 29, 2:50 PM MDT, 51 minutes before

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Local storm report, Aug 29, 2:59 PM MDT, 42 minutes before

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Local storm report, Aug 29, 3:00 PM MDT, 41 minutes before

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Local storm report, Aug 29, 3:03 PM MDT, 38 minutes before

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Special weather statement, Aug 29, 3:21 PM MDT, 20 minutes before

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Special weather statement, Aug 29, 3:33 PM MDT, 8 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 29, 12:58 PM MDT	Special Weather Statement	BYZ	Stillwater	62 min
Aug 29, 1:16 PM MDT	Special Weather Statement	BYZ	Golden Valley	59 min
Aug 29, 1:43 PM MDT	Special Weather Statement	BYZ	Carbon	62 min
Aug 29, 1:45 PM MDT	Severe Thunderstorm Warning	BYZ	Carbon, Stillwater, Yellowstone	60 min
Aug 29, 2:03 PM MDT	Special Weather Statement	BYZ	Golden Valley	57 min
Aug 29, 2:29 PM MDT	Special Weather Statement	BYZ	Carbon	61 min
Aug 29, 2:44 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Yellowstone	61 min
Aug 29, 2:50 PM MDT	Special Weather Statement	BYZ	Yellowstone	55 min
Aug 29, 3:21 PM MDT	Special Weather Statement	BYZ	Musselshell	39 min
Aug 29, 3:33 PM MDT	Special Weather Statement	BYZ	Yellowstone	27 min
Aug 29, 3:45 PM MDT	Special Weather Statement	BYZ	Stillwater	30 min
Aug 29, 3:46 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Treasure, Yellowstone	28 min
Aug 29, 4:38 PM MDT	Special Weather Statement	BYZ	Golden Valley	37 min
Aug 29, 4:40 PM MDT	Special Weather Statement	BYZ	Treasure	65 min
Aug 29, 5:00 PM MDT	Special Weather Statement	BYZ	Rosebud	45 min
Aug 29, 5:52 PM MDT	Special Weather Statement	BYZ	Powder River	53 min
Aug 29, 4:21 PM MDT	Special Weather Statement	BYZ	Sheridan	39 min
Aug 29, 5:47 PM MDT	Severe Thunderstorm Warning	BYZ	Sheridan	28 min
Aug 29, 5:48 PM MDT	Special Weather Statement	BYZ	Sheridan	42 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.