Alert archive / Montana / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 9, NWS Billings, MT

May 17, 2018Musselshell County, Montana

NWS Billings, MT issued this severe thunderstorm warning at May 17, 2018, 4:25 PM MDT for Musselshell County, Montana. It was in force for 50 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: May 17, 2018, 4:25 PM MDT (22:25 UTC)
Expired: May 17, 2018, 5:15 PM MDT
In force: 50 min
Issued by: NWS Billings, MT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Musselshell County, MT

The radar

The Billings radar (KBLX), 73 km from the middle of the area, began a volume at 22:25 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, 10.4 hours before the alert went out and 198 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: 1319 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -31 m²/s²
0-3 km storm-relative helicity: 48 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 May 17, 2:19 PM MDT, 2 hours 6 minutes earlier.

Area forecast discussion, May 17, 2:19 PM MDT, 2 hours 6 minutes before

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Hazardous weather outlook, May 17, 2:26 PM MDT, 1 hour 59 minutes before

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In the hours before

Special weather statement, May 17, 3:34 PM MDT, 51 minutes before

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Local storm report, May 17, 3:40 PM MDT, 45 minutes before

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Special weather statement, May 17, 4:01 PM MDT, 24 minutes before

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Local storm report, May 17, 4:03 PM MDT, 22 minutes before

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Special weather statement, May 17, 4:05 PM MDT, 20 minutes before

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Local storm report, May 17, 4:17 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
May 16, 6:27 PM MDT	Special Weather Statement	BYZ	Carter	48 min
May 16, 7:10 PM MDT	Special Weather Statement	BYZ	Fallon	65 min
May 16, 7:48 PM MDT	Severe Thunderstorm Warning	BYZ	Fallon	57 min
May 16, 8:05 PM MDT	Special Weather Statement	BYZ	Big Horn	40 min
May 16, 8:42 PM MDT	Special Weather Statement	BYZ	Big Horn	48 min
May 16, 10:40 PM MDT	Special Weather Statement	BYZ		50 min
May 16, 10:59 PM MDT	Special Weather Statement	BYZ	Rosebud	46 min
May 17, 2:11 PM MDT	Special Weather Statement	BYZ	Fallon	34 min
May 17, 3:32 PM MDT	Special Weather Statement	BYZ	Fallon	43 min
May 17, 3:34 PM MDT	Special Weather Statement	BYZ	Stillwater	26 min
May 17, 4:01 PM MDT	Special Weather Statement	BYZ	Musselshell	29 min
May 17, 4:05 PM MDT	Special Weather Statement	BYZ	Yellowstone	40 min
May 17, 5:12 PM MDT	Areal Flood Advisory	BYZ	Musselshell, Yellowstone	3 hr
May 17, 5:18 PM MDT	Special Weather Statement	BYZ	Powder River	27 min
May 17, 5:18 PM MDT	Severe Thunderstorm Warning	BYZ	Musselshell	19 min
May 17, 5:32 PM MDT	Special Weather Statement	BYZ	Treasure	43 min
May 17, 5:36 PM MDT	Special Weather Statement	BYZ	Powder River	24 min
May 17, 5:51 PM MDT	Special Weather Statement	BYZ	Musselshell	39 min
May 17, 5:51 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Powder River	24 min

Nearby

Severe Thunderstorm Warnings in Montana, 2018 Every severe thunderstorm warning in 2018

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.