Alert archive / Montana / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 109, NWS Billings, MT

July 15, 20114 counties in Montana

NWS Billings, MT issued this severe thunderstorm warning at Jul 15, 2011, 10:38 PM MDT for 4 counties in Montana. It was in force for 52 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, 10:38 PM MDT (04:38 UTC)
Expired: Jul 15, 2011, 11:30 PM MDT
In force: 52 min
Issued by: NWS Billings, MT
Area: Storm-based polygon

Counties Musselshell County, MT, Rosebud County, MT, Treasure County, MT, Yellowstone County, MT

The radar

The Billings radar (KBLX), 83 km from the middle of the area, began a volume at 04:37 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 00:00Z, 4.6 hours before the alert went out and 237 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: 2980 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 161 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Jul 15, 9:37 PM MDT, 1 hour 1 minute earlier.

Area forecast discussion, Jul 15, 9:37 PM MDT, 1 hour 1 minute before

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Hazardous weather outlook, Jul 15, 9:41 PM MDT, 57 minutes before

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In the hours before

Special weather statement, Jul 15, 5:12 PM MDT, 5 hours 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BILLINGS MT
512 PM MDT FRI JUL 15 2011

MTZ029-034-042-063-160015-
GOLDEN VALLEY MT-JUDITH GAP MT-MUSSELSHELL MT-NORTHERN STILLWATER MT-
512 PM MDT FRI JUL 15 2011

...SIGNIFICANT WEATHER ADVISORY FOR GOLDEN VALLEY...NORTHEASTERN
STILLWATER AND WESTERN MUSSELSHELL COUNTIES UNTIL 615 PM MDT...

AT 511 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 8 MILES SOUTH OF RYEGATE...OR 33 MILES SOUTHEAST
OF HARLOWTON...MOVING NORTHEAST AT 25 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.

AREAS AFFECTED BY THIS STORM INCLUDE...ROUNDUP...RYEGATE...
FRANKLIN...BELMONT...CUSHMAN...LAVINA AND KLEIN.

THIS STORM MAY INTENSIFY...AND A SEVERE THUNDERSTORM WATCH IS IN
EFFECT FOR THIS AREA. BE CERTAIN TO MONITOR LOCAL RADIO AND TV
STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 4627 10803 4626 10832 4624 10840 4620 10841
      4612 10883 4614 10892 4611 10892 4604 10928
      4622 10942 4623 10940 4653 10939 4676 10889
      4676 10879
TIME...MOT...LOC 2312Z 239DEG 23KT 4619 10923

Local storm report, Jul 15, 6:22 PM MDT, 4 hours 16 minutes before

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Special weather statement, Jul 15, 9:22 PM MDT, 1 hour 16 minutes before

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Local storm report, Jul 15, 9:35 PM MDT, 1 hour 3 minutes before

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Special weather statement, Jul 15, 10:00 PM MDT, 38 minutes before

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Special weather statement, Jul 15, 10:26 PM MDT, 12 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
Jul 15, 6:44 PM MDT	Severe Thunderstorm Warning	BYZ	Musselshell, Rosebud	61 min
Jul 15, 9:22 PM MDT	Special Weather Statement	BYZ	Treasure	38 min
Jul 15, 10:00 PM MDT	Special Weather Statement	BYZ	Musselshell	45 min
Jul 15, 10:26 PM MDT	Special Weather Statement	BYZ	Treasure	64 min
Jul 15, 10:43 PM MDT	Special Weather Statement	BYZ	Yellowstone	62 min
Jul 15, 10:43 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	41 min
Jul 15, 11:14 PM MDT	Severe Thunderstorm Warning	BYZ	Yellowstone	17 min
Jul 15, 11:27 PM MDT	Special Weather Statement	BYZ	Treasure	63 min
Jul 16, 5:14 PM MDT	Special Weather Statement	BYZ	Golden Valley	46 min
Jul 16, 5:25 PM MDT	Severe Thunderstorm Warning	BYZ	Golden Valley, Musselshell	35 min
Jul 16, 5:59 PM MDT	Special Weather Statement	BYZ	Musselshell	46 min

Nearby

Severe Thunderstorm Warnings in Montana, 2011 Every 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.