Alert archive / Montana / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 79, NWS Billings, MT

July 27, 2016Powder River County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Jul 27, 2016, 8:21 PM MDT for Powder River County, Montana. It was in force for 54 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 27, 2016, 8:21 PM MDT (02:21 UTC)
Expired: Jul 27, 2016, 9:15 PM MDT
In force: 54 min
Issued by: NWS Billings, MT
Area: Storm-based polygon
Hail: 2.0 in
Wind: 60.0 mph

County Powder River County, MT

The radar

The Billings radar (KBLX), 237 km from the middle of the area, began a volume at 02:22 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

Rapid City, SD (KRAP), launched 00:00Z, 2.4 hours before the alert went out and 262 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: 470 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 1394 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.2

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 Jul 27, 2:43 PM MDT, 5 hours 38 minutes earlier.

Area forecast discussion, Jul 27, 2:43 PM MDT, 5 hours 38 minutes before

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Hazardous weather outlook, Jul 27, 2:59 PM MDT, 5 hours 22 minutes before

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In the hours before

Special weather statement, Jul 27, 3:10 PM MDT, 5 hours 11 minutes before

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Local storm report, Jul 27, 3:37 PM MDT, 4 hours 44 minutes before

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Local storm report, Jul 27, 3:55 PM MDT, 4 hours 26 minutes before

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Special weather statement, Jul 27, 4:01 PM MDT, 4 hours 20 minutes before

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Local storm report, Jul 27, 4:15 PM MDT, 4 hours 6 minutes before

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Special weather statement, Jul 27, 4:34 PM MDT, 3 hours 47 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
Jul 27, 6:08 PM MDT	Special Weather Statement	BYZ	Rosebud	67 min
Jul 27, 6:25 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	65 min
Jul 27, 6:41 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud, Treasure	64 min
Jul 27, 7:15 PM MDT	Special Weather Statement	BYZ	Treasure	45 min
Jul 27, 7:21 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud, Treasure	54 min
Jul 27, 7:22 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Rosebud	53 min
Jul 27, 7:26 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Powder River, Rosebud	64 min
Jul 27, 8:10 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	50 min
Jul 27, 8:46 PM MDT	Special Weather Statement	BYZ	Custer	44 min
Jul 27, 9:01 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Powder River	59 min
Jul 27, 9:14 PM MDT	Severe Thunderstorm Warning	BYZ	Powder River	40 min
Jul 27, 9:25 PM MDT	Special Weather Statement	BYZ	Powder River	50 min
Jul 27, 9:43 PM MDT	Severe Thunderstorm Warning	BYZ	Powder River	25 min
Jul 27, 9:55 PM MDT	Severe Thunderstorm Warning	BYZ	Powder River	21 min

Nearby

Severe Thunderstorm Warnings in Montana, 2016 Every severe thunderstorm warning in 2016

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.