Alert archive / Montana / Tornado Warnings in 2010

Tornado Warning 9, NWS Billings, MT

June 20, 2010Big Horn County, Rosebud County, Montana; Sheridan County, Wyoming

NWS Billings, MT issued this tornado warning at Jun 20, 2010, 5:03 PM MDT for Big Horn County, Rosebud County, Montana; Sheridan County, Wyoming. It was in force for 27 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
Jun 20, 2010, 5:03 PM MDT (23:03 UTC)
Expired
Jun 20, 2010, 5:30 PM MDT
In force
27 min
Issued by
NWS Billings, MT
Area
Storm-based polygon

Counties Big Horn County, MT, Rosebud County, MT, Sheridan County, WY

The radar

The Billings radar (KBLX), 129 km from the middle of the area, began a volume at 23:06 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
Jun 20, 12:55 PM MDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 11.1 hours before the alert went out and 351 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, Great_falls, MT at 12:00Z on 2010-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 9 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, Great_falls, MT at 12:00Z on 2010-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -17 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
9 J/kg
Mixed-layer CIN
-110 J/kg
Mixed-layer LCL
1121 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-17 m²/s²
0-3 km storm-relative helicity
32 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at Jun 20, 3:04 PM MDT, 1 hour 59 minutes earlier.

Area forecast discussion, Jun 20, 3:04 PM MDT, 1 hour 59 minutes before
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Hazardous weather outlook, Jun 20, 1:07 PM MDT, 3 hours 56 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
107 PM MDT SUN JUN 20 2010

MTZ028>042-056>058-063>068-WYZ098-099-211915-
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-
107 PM MDT SUN JUN 20 2010

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

SCATTERED THUNDERSTORMS WILL IMPACT THE FORECAST AREA THIS
AFTERNOON THROUGH TONIGHT. SOME OF THESE STORMS MAY BECOME
SEVERE...ESPECIALLY FROM ROUNDUP TO BILLINGS TO RED LODGE AND
EAST. THE PRIMARY THREATS WILL BE LARGE HAIL...STRONG
WINDS...HEAVY RAIN AND FREQUENT LIGHTNING.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

A COLD FRONT WILL PUSH THROUGH THE FORECAST AREA MONDAY AFTERNOON
THROUGH MONDAY EVENING. THUNDERSTORMS ARE EXPECTED TO DEVELOP
ALONG THE FRONT. SOME OF THESE STORMS MAY BECOME SEVERE
ESPECIALLY OVER EXTREME SOUTHEASTERN MONTANA.

MONITOR NOAA WEATHER RADIO FOR THE LATEST
INFORMATION...FORECASTS...AND WARNINGS.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Special weather statement, Jun 20, 1:46 PM MDT, 3 hours 17 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BILLINGS MT
146 PM MDT SUN JUN 20 2010

MTZ038-202045-
SOUTHERN BIG HORN MT-
146 PM MDT SUN JUN 20 2010

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL BIG HORN COUNTY UNTIL 245
PM MDT...

AT 138 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 20 MILES SOUTHWEST OF LODGE GRASS...OR 38 MILES
NORTHWEST OF SHERIDAN...MOVING NORTH AT 15 MPH.

HAIL UP TO THE SIZE OF PENNIES IS EXPECTED WITH THIS STORM...ALONG
WITH HEAVY RAIN.

AREAS AFFECTED BY THIS STORM INCLUDE...LODGE GRASS.

THIS INCLUDES INTERSTATE 90 BETWEEN MILE MARKERS 522 AND 537.

LAT...LON 4546 10778 4543 10723 4501 10750 4502 10775
TIME...MOT...LOC 1946Z 184DEG 13KT 4511 10762

RNL
Local storm report, Jun 20, 2:58 PM MDT, 2 hours 5 minutes before
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Local storm report, Jun 20, 3:54 PM MDT, 1 hour 9 minutes before
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Local storm report, Jun 20, 4:33 PM MDT, 30 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 19, 6:41 PM MDTSpecial Weather StatementBYZBig Horn64 min
Jun 20, 12:00 PM MDTAreal Flood AdvisoryBYZWheatland24 hr
Jun 20, 1:46 PM MDTSpecial Weather StatementBYZBig Horn59 min
Jun 20, 2:25 PM MDTSevere Thunderstorm WarningBYZBig Horn, Treasure, Yellowstone32 min
Jun 20, 2:44 PM MDTSevere Thunderstorm WarningBYZPark46 min
Jun 20, 3:14 PM MDTSevere Thunderstorm WarningBYZRosebud, Treasure61 min
Jun 20, 3:17 PM MDTSevere Thunderstorm WarningBYZRosebud58 min
Jun 20, 3:20 PM MDTSevere Thunderstorm WarningBYZBig Horn18 min
Jun 20, 3:28 PM MDTSevere Thunderstorm WarningBYZRosebud, Treasure, Yellowstone62 min
Jun 20, 3:39 PM MDTSevere Thunderstorm WarningBYZPowder River51 min
Jun 20, 3:40 PM MDTSevere Thunderstorm WarningBYZBig Horn65 min
Jun 20, 3:53 PM MDTSevere Thunderstorm WarningBYZYellowstone19 min
Jun 20, 4:15 PM MDTSevere Thunderstorm WarningBYZMusselshell, Yellowstone60 min
Jun 20, 4:18 PM MDTSevere Thunderstorm WarningBYZGolden Valley57 min
Jun 20, 4:26 PM MDTSevere Thunderstorm WarningBYZMusselshell, Rosebud23 min
Jun 20, 4:27 PM MDTTornado WarningBYZYellowstone33 min
Jun 20, 4:46 PM MDTSevere Thunderstorm WarningBYZPowder River59 min
Jun 20, 4:47 PM MDTSevere Thunderstorm WarningBYZBig Horn, Carbon, Yellowstone43 min
Jun 20, 4:55 PM MDTSevere Thunderstorm WarningBYZBig Horn, Rosebud65 min
Jun 20, 4:56 PM MDTFlash Flood WarningBYZYellowstone3 hr
Jun 20, 4:59 PM MDTTornado WarningBYZYellowstone31 min
Jun 20, 5:18 PM MDTSevere Thunderstorm WarningBYZGolden Valley, Musselshell, Yellowstone46 min
Jun 20, 5:31 PM MDTTornado WarningBYZYellowstone29 min
Jun 20, 5:36 PM MDTSevere Thunderstorm WarningBYZCarter54 min
Jun 20, 2:32 PM MDTSevere Thunderstorm WarningBYZSheridan58 min
Jun 20, 3:09 PM MDTSevere Thunderstorm WarningBYZSheridan26 min
Jun 20, 5:45 PM MDTSevere Thunderstorm WarningBYZSheridan60 min

Nearby

Tornado Warnings in Montana, 2010Tornado Warnings in Wyoming, 2010Every tornado warning in 2010Tornadoes in 2010

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.