Alert archive / Montana / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 182, NWS Billings, MT

September 7, 2013Custer County, Fallon County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Sep 7, 2013, 3:00 PM MDT for Custer County, Fallon County, Montana. It was in force for 60 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 7, 2013, 3:00 PM MDT (21:00 UTC)
Expired
Sep 7, 2013, 4:00 PM MDT
In force
60 min
Issued by
NWS Billings, MT
Area
Storm-based polygon

Counties Custer County, MT, Fallon County, MT

The radar

The Glasgow radar (KGGW), 246 km from the middle of the area, began a volume at 21:01 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

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 9.0 hours before the alert went out and 246 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-pSkew-T log-p diagram, Glasgow Intl Airport, MT at 12:00Z on 2013-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1350 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Glasgow Intl Airport, MT at 12:00Z on 2013-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 77 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1350 J/kg
Mixed-layer CIN
-125 J/kg
Mixed-layer LCL
1012 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
77 m²/s²
0-3 km storm-relative helicity
116 m²/s²
Significant tornado parameter
0.0
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 Sep 7, 9:51 AM MDT, 5 hours 9 minutes earlier.

Area forecast discussion, Sep 7, 9:51 AM MDT, 5 hours 9 minutes before
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Hazardous weather outlook, Sep 7, 2:20 PM MDT, 40 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
220 PM MDT SAT SEP 7 2013

MTZ028>042-056>058-063>068-WYZ098-099-082030-
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 BIG HORN MOUNTAINS-SHERIDAN FOOTHILLS-
220 PM MDT SAT SEP 7 2013

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

SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS THE AREA THROUGH THE
EVENING...WITH THE HIGHEST RISK ALONG AND EAST OF A LINE FROM
BILLINGS TO SHERIDAN...INCLUDING ALL OF SOUTHEASTERN MONTANA.
THE STORMS MAY PRODUCE LARGE HAIL...DAMAGING WINDS...FREQUENT
LIGHTNING AND VERY HEAVY RAINFALL. ISOLATED TORNADOES ARE ALSO
POSSIBLE IN SOUTHEAST MONTANA. A FLASH FLOOD WATCH IS IN EFFECT
THROUGH LATE TONIGHT OVER PARTS OF SOUTH CENTRAL AND ALL OF
SOUTHEAST MONTANA...AND FOR SHERIDAN COUNTY IN WYOMING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

SEVERE THUNDERSTORMS ARE POSSIBLE AGAIN SUNDAY ACROSS SOUTHEAST
MONTANA. HEAVY RAINFALL IS POSSIBLE WITH STORMS OVER THE ENTIRE
AREA ON SUNDAY.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS WILL LIKELY BE NEEDED THROUGH THIS EVENING.

CJS

In the hours before

Special weather statement, Sep 7, 9:30 AM MDT, 5 hours 30 minutes before
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Special weather statement, Sep 7, 10:55 AM MDT, 4 hours 5 minutes before
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Special weather statement, Sep 7, 1:40 PM MDT, 1 hour 20 minutes before
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Special weather statement, Sep 7, 2:17 PM MDT, 43 minutes before
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Special weather statement, Sep 7, 2:27 PM MDT, 33 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Sep 6, 6:03 PM MDTSpecial Weather StatementBYZ42 min
Sep 6, 6:15 PM MDTSpecial Weather StatementBYZRosebud, Treasure45 min
Sep 6, 7:02 PM MDTSpecial Weather StatementBYZPowder River58 min
Sep 6, 8:20 PM MDTSpecial Weather StatementBYZCuster40 min
Sep 6, 9:13 PM MDTSpecial Weather StatementBYZPowder River32 min
Sep 6, 9:44 PM MDTSpecial Weather StatementBYZPowder River31 min
Sep 6, 10:41 PM MDTSpecial Weather StatementBYZCarter64 min
Sep 6, 11:18 PM MDTSpecial Weather StatementBYZPowder River57 min
Sep 6, 11:46 PM MDTSpecial Weather StatementBYZCarter59 min
Sep 7, 12:01 AM MDTSpecial Weather StatementBYZPowder River29 min
Sep 7, 1:50 AM MDTSpecial Weather StatementBYZCarter55 min
Sep 7, 8:01 AM MDTSpecial Weather StatementBYZCuster44 min
Sep 7, 8:49 AM MDTSpecial Weather StatementBYZCuster41 min
Sep 7, 9:30 AM MDTSpecial Weather StatementBYZCuster45 min
Sep 7, 9:49 AM MDTFlash Flood WatchBYZBig Horn, Carter, Custer, Fallon, Musselshell, Powder River and 3 more40 hr
Sep 7, 10:55 AM MDTSpecial Weather StatementBYZFallon50 min
Sep 7, 1:40 PM MDTSpecial Weather StatementBYZCuster35 min
Sep 7, 2:17 PM MDTSpecial Weather StatementBYZCuster43 min
Sep 7, 2:27 PM MDTSpecial Weather StatementBYZPark48 min
Sep 7, 3:17 PM MDTSpecial Weather StatementBYZSweet Grass43 min
Sep 7, 3:58 PM MDTSevere Thunderstorm WarningBYZFallon47 min
Sep 7, 4:09 PM MDTSpecial Weather StatementBYZFallon51 min
Sep 7, 4:20 PM MDTSpecial Weather StatementBYZSweet Grass40 min
Sep 7, 4:21 PM MDTSevere Thunderstorm WarningBYZCarter, Fallon54 min
Sep 7, 4:59 PM MDTSpecial Weather StatementBYZGolden Valley61 min
Sep 7, 5:12 PM MDTSevere Thunderstorm WarningBYZCarter, Fallon63 min
Sep 7, 5:22 PM MDTSevere Thunderstorm WarningBYZGolden Valley, Stillwater, Sweet Grass38 min
Sep 7, 5:59 PM MDTSevere Thunderstorm WarningBYZGolden Valley, Stillwater, Sweet Grass61 min

Nearby

Severe Thunderstorm Warnings in Montana, 2013Every severe thunderstorm warning in 2013

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.