Alert archive / Montana / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 91, NWS Billings, MT

September 5, 2015Fallon County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Sep 5, 2015, 9:12 PM MDT for Fallon 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: Sep 5, 2015, 9:12 PM MDT (03:12 UTC)
Expired: Sep 5, 2015, 10:03 PM MDT
In force: 51 min
Issued by: NWS Billings, MT
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

County Fallon County, MT

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Sep 5, 6:00 PM MDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 3.2 hours before the alert went out and 288 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: 559 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 1382 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.0

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 Sep 5, 8:27 PM MDT, 45 minutes earlier.

Area forecast discussion, Sep 5, 8:27 PM MDT, 45 minutes before

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Hazardous weather outlook, Sep 5, 3:00 PM MDT, 6 hours 12 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
300 PM MDT SAT SEP 5 2015

MTZ028>042-056>058-063>068-WYZ098-099-062100-
SOUTHERN WHEATLAND-MUSSELSHELL-TREASURE-NORTHERN ROSEBUD-CUSTER-
FALLON-NORTHERN STILLWATER-YELLOWSTONE-POWDER RIVER-CARTER-
SOUTHERN BIG HORN-EASTERN CARBON-NORTHERN PARK-
NORTHERN SWEET GRASS-GOLDEN VALLEY-RED LODGE FOOTHILLS-
NORTHERN BIG HORN-SOUTHERN ROSEBUD-JUDITH GAP-PARADISE VALLEY-
LIVINGSTON AREA-BEARTOOTH FOOTHILLS-ABSAROKA/BEARTOOTH MOUNTAINS-
CRAZY MOUNTAINS-NORTHEAST BIGHORN MOUNTAINS-SHERIDAN FOOTHILLS-
300 PM MDT SAT SEP 5 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
MONTANA...SOUTH CENTRAL MONTANA...SOUTHEAST MONTANA AND NORTH
CENTRAL WYOMING.

.DAY ONE...THIS AFTERNOON AND TONIGHT

STRONG TO SEVERE THUNDERSTORMS WITH HAIL...STRONG WINDS...HEAVY
RAINFALL AND DANGEROUS LIGHTNING ARE EXPECTED LATE THIS AFTERNOON
INTO THE EVENING. THE GREATEST POTENTIAL FOR SEVERE STORMS IS FROM
BILLINGS EASTWARD. PLEASE MONITOR THE LATEST WEATHER INFORMATION
SHOULD STORMS APPROACH YOUR VICINITY.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

In the hours before

Local storm report, Sep 5, 8:27 PM MDT, 45 minutes before

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Special weather statement, Sep 5, 8:28 PM MDT, 44 minutes before

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Local storm report, Sep 5, 8:42 PM MDT, 30 minutes before

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Local storm report, Sep 5, 8:53 PM MDT, 19 minutes before

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Local storm report, Sep 5, 8:58 PM MDT, 14 minutes before

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Local storm report, Sep 5, 9:12 PM MDT, 0 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
Sep 5, 6:15 PM MDT	Special Weather Statement	BYZ	Big Horn	45 min
Sep 5, 6:27 PM MDT	Special Weather Statement	BYZ	Big Horn	48 min
Sep 5, 6:58 PM MDT	Special Weather Statement	BYZ	Big Horn	62 min
Sep 5, 7:04 PM MDT	Special Weather Statement	BYZ		41 min
Sep 5, 7:14 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn	46 min
Sep 5, 7:20 PM MDT	Severe Thunderstorm Warning	BYZ	Powder River, Rosebud	55 min
Sep 5, 7:41 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	49 min
Sep 5, 7:50 PM MDT	Special Weather Statement	BYZ	Rosebud	55 min
Sep 5, 8:14 PM MDT	Special Weather Statement	BYZ	Powder River	61 min
Sep 5, 8:19 PM MDT	Severe Thunderstorm Warning	BYZ	Powder River	56 min
Sep 5, 8:25 PM MDT	Severe Thunderstorm Warning	BYZ	Carter, Powder River	32 min
Sep 5, 8:28 PM MDT	Special Weather Statement	BYZ	Custer	32 min
Sep 5, 8:51 PM MDT	Severe Thunderstorm Warning	BYZ	Carter, Fallon	54 min
Sep 5, 9:20 PM MDT	Special Weather Statement	BYZ	Custer	40 min
Sep 5, 9:38 PM MDT	Special Weather Statement	BYZ	Carter	67 min
Sep 6, 1:30 AM MDT	Special Weather Statement	BYZ	Powder River	60 min

Nearby

Severe Thunderstorm Warnings in Montana, 2015 Every severe thunderstorm warning in 2015

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.