Alert archive / Montana / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 106, NWS Billings, MT

July 15, 2011Custer County, Fallon County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Jul 15, 2011, 1:29 AM MDT for Custer County, Fallon County, Montana. It was in force for 46 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 15, 2011, 1:29 AM MDT (07:29 UTC)
Expired
Jul 15, 2011, 2:15 AM MDT
In force
46 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 07:30 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 watch it was issued in

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

IssuedProductOfficeLasted
Jul 14, 10:01 PM MDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 7.5 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 00:00Z on 2011-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 272 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 00:00Z on 2011-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -22 square meters per square second.19395878Sfc1 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
272 J/kg
Mixed-layer CIN
-124 J/kg
Mixed-layer LCL
2109 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
-22 m²/s²
0-3 km storm-relative helicity
106 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

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 14, 11:05 PM MDT, 2 hours 24 minutes earlier.

Area forecast discussion, Jul 14, 11:05 PM MDT, 2 hours 24 minutes before
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Hazardous weather outlook, Jul 14, 9:50 PM MDT, 3 hours 39 minutes before
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In the hours before

Special weather statement, Jul 14, 9:03 PM MDT, 4 hours 26 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BILLINGS MT
903 PM MDT THU JUL 14 2011

MTZ031-057-150400-
NORTHERN BIG HORN MT-NORTHERN ROSEBUD MT-
903 PM MDT THU JUL 14 2011

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL ROSEBUD AND NORTHEASTERN
BIG HORN COUNTIES UNTIL 1000 PM MDT...

AT 859 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR FORSYTH TO 14
MILES NORTH OF BUSBY...AND MOVING EAST AT 25 MPH.

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

THESE STORMS WILL BE NEAR...
ROSEBUD AND COLSTRIP BY 930 PM MDT.
HATHAWAY BY 1000 PM MDT.

LAT...LON 4635 10617 4572 10624 4567 10705 4587 10699
      4587 10694 4602 10694 4621 10688
TIME...MOT...LOC 0301Z 258DEG 20KT 4619 10672 4573 10695
Local storm report, Jul 14, 9:14 PM MDT, 4 hours 15 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BILLINGS MT
914 PM MDT THU JUL 14 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0910 PM     HAIL             10 WNW COLSTRIP         45.97N 106.81W
07/14/2011  E1.75 INCH       ROSEBUD            MT   TRAINED SPOTTER

&&

RNL
Local storm report, Jul 14, 9:24 PM MDT, 4 hours 5 minutes before
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Local storm report, Jul 14, 10:31 PM MDT, 2 hours 58 minutes before
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Special weather statement, Jul 14, 11:02 PM MDT, 2 hours 27 minutes before
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Special weather statement, Jul 14, 11:59 PM MDT, 1 hour 30 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 14, 6:01 PM MDTSevere Thunderstorm WarningBYZTreasure, Yellowstone59 min
Jul 14, 6:09 PM MDTSevere Thunderstorm WarningBYZMusselshell, Rosebud51 min
Jul 14, 6:28 PM MDTSevere Thunderstorm WarningBYZBig Horn, Treasure62 min
Jul 14, 6:45 PM MDTSpecial Weather StatementBYZRosebud60 min
Jul 14, 6:59 PM MDTSevere Thunderstorm WarningBYZRosebud, Treasure31 min
Jul 14, 7:12 PM MDTSpecial Weather StatementBYZMusselshell33 min
Jul 14, 7:16 PM MDTSevere Thunderstorm WarningBYZBig Horn, Rosebud, Treasure59 min
Jul 14, 7:33 PM MDTSpecial Weather StatementBYZCuster57 min
Jul 14, 7:45 PM MDTSevere Thunderstorm WarningBYZCuster, Rosebud60 min
Jul 14, 7:47 PM MDTSpecial Weather StatementBYZTreasure28 min
Jul 14, 8:02 PM MDTSevere Thunderstorm WarningBYZCuster, Powder River, Rosebud58 min
Jul 14, 8:19 PM MDTSpecial Weather StatementBYZRosebud41 min
Jul 14, 8:59 PM MDTSevere Thunderstorm WarningBYZCuster61 min
Jul 14, 9:03 PM MDTSpecial Weather StatementBYZRosebud57 min
Jul 14, 9:17 PM MDTSevere Thunderstorm WarningBYZRosebud58 min
Jul 14, 9:40 PM MDTSevere Thunderstorm WarningBYZCarter, Custer, Fallon50 min
Jul 14, 10:16 PM MDTSevere Thunderstorm WarningBYZRosebud29 min
Jul 14, 10:29 PM MDTFlash Flood WarningBYZRosebud3 hr
Jul 14, 10:29 PM MDTSevere Thunderstorm WarningBYZFallon46 min
Jul 14, 11:02 PM MDTSpecial Weather StatementBYZRosebud58 min
Jul 14, 11:59 PM MDTSpecial Weather StatementBYZCuster61 min
Jul 15, 12:43 AM MDTSevere Thunderstorm WarningBYZCuster47 min
Jul 15, 2:17 AM MDTSpecial Weather StatementBYZFallon43 min
Jul 15, 2:22 AM MDTSpecial Weather StatementBYZFallon53 min
Jul 15, 4:25 PM MDTSpecial Weather StatementBYZGolden Valley65 min
Jul 15, 5:12 PM MDTSpecial Weather StatementBYZGolden Valley, Musselshell63 min
Jul 15, 5:55 PM MDTSevere Thunderstorm WarningBYZGolden Valley, Musselshell65 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.