Alert archive / Montana / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 85, NWS Billings, MT

July 13, 2011Custer County, Rosebud County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Jul 13, 2011, 9:51 PM MDT for Custer County, Rosebud County, Montana. It was in force for 34 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 13, 2011, 9:51 PM MDT (03:51 UTC)
Expired
Jul 13, 2011, 10:25 PM MDT
In force
34 min
Issued by
NWS Billings, MT
Area
Storm-based polygon

Counties Custer County, MT, Rosebud County, MT

The radar

The Billings radar (KBLX), 194 km from the middle of the area, began a volume at 03:51 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 (KUNR), launched 00:00Z, 3.9 hours before the alert went out and 352 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, Rapid City, SD at 00:00Z on 2011-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1030 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, Rapid City, SD at 00:00Z on 2011-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 133 square meters per square second.1939Sfc1 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
1030 J/kg
Mixed-layer CIN
-64 J/kg
Mixed-layer LCL
995 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
133 m²/s²
0-3 km storm-relative helicity
157 m²/s²
Significant tornado parameter
0.7
Supercell composite
6.1

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 13, 9:08 PM MDT, 43 minutes earlier.

Area forecast discussion, Jul 13, 9:08 PM MDT, 43 minutes before
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Hazardous weather outlook, Jul 13, 9:11 PM MDT, 40 minutes before
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In the hours before

Special weather statement, Jul 13, 4:35 PM MDT, 5 hours 16 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BILLINGS MT
435 PM MDT WED JUL 13 2011

MTZ035-132330-
YELLOWSTONE MT-
435 PM MDT WED JUL 13 2011

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL YELLOWSTONE COUNTY UNTIL
530 PM MDT...

AT 430 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 11 MILES SOUTH OF BILLINGS...MOVING NORTH AT 15
MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.

THIS STORM WILL BE NEAR...
BILLINGS AROUND 510 PM MDT.
BILLINGS WEST END AND LOCKWOOD AROUND 515 PM MDT.
BILLINGS HEIGHTS AROUND 520 PM MDT.

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

LAT...LON 4594 10867 4601 10822 4557 10832 4553 10857
TIME...MOT...LOC 2235Z 169DEG 15KT 4564 10847
Special weather statement, Jul 13, 5:40 PM MDT, 4 hours 11 minutes before
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Special weather statement, Jul 13, 5:43 PM MDT, 4 hours 8 minutes before
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Special weather statement, Jul 13, 6:05 PM MDT, 3 hours 46 minutes before
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Special weather statement, Jul 13, 6:40 PM MDT, 3 hours 11 minutes before
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Special weather statement, Jul 13, 9:45 PM MDT, 6 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 6:05 PM MDTSpecial Weather StatementBYZYellowstone55 min
Jul 13, 6:40 PM MDTSpecial Weather StatementBYZTreasure65 min
Jul 13, 9:45 PM MDTSpecial Weather StatementBYZPrairie60 min
Jul 14, 2:28 PM MDTSpecial Weather StatementBYZGolden Valley62 min
Jul 14, 3:00 PM MDTSpecial Weather StatementBYZWheatland60 min
Jul 14, 3:23 PM MDTSpecial Weather StatementBYZWheatland37 min
Jul 14, 3:44 PM MDTSpecial Weather StatementBYZCarbon31 min
Jul 14, 3:44 PM MDTSevere Thunderstorm WarningBYZGolden Valley, Wheatland40 min
Jul 14, 4:07 PM MDTSpecial Weather StatementBYZBig Horn53 min
Jul 14, 4:07 PM MDTSevere Thunderstorm WarningBYZCarbon, Stillwater, Yellowstone38 min
Jul 14, 4:17 PM MDTSpecial Weather StatementBYZCarbon58 min
Jul 14, 4:29 PM MDTSevere Thunderstorm WarningBYZYellowstone61 min
Jul 14, 4:59 PM MDTTornado WarningBYZYellowstone31 min
Jul 14, 5:12 PM MDTSpecial Weather StatementBYZBig Horn63 min
Jul 14, 5:13 PM MDTSevere Thunderstorm WarningBYZYellowstone62 min
Jul 14, 5:27 PM MDTSevere Thunderstorm WarningBYZBig Horn63 min
Jul 14, 5:30 PM MDTSevere Thunderstorm WarningBYZMusselshell, Yellowstone60 min
Jul 14, 5:35 PM MDTSevere Thunderstorm WarningBYZGolden Valley, Stillwater, Yellowstone33 min

Nearby

Severe Thunderstorm Warnings in Montana, 2011Every 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.