Alert archive / Montana / Tornado Warnings in 2010

Tornado Warning 28, NWS Billings, MT

June 21, 2010Carter County, Montana

NWS Billings, MT issued this tornado warning at Jun 21, 2010, 8:42 PM MDT for Carter County, Montana. It was in force for 33 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 21, 2010, 8:42 PM MDT (02:42 UTC)
Expired
Jun 21, 2010, 9:15 PM MDT
In force
33 min
Issued by
NWS Billings, MT
Area
Storm-based polygon

County Carter County, MT

The radar

The Rapid City radar (KUDX), 205 km from the middle of the area, began a volume at 02:43 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 21, 2:08 PM MDTTornado WatchSPC7 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 2.7 hours before the alert went out and 327 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, Bismarck Municip, ND at 00:00Z on 2010-06-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 279 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, Bismarck Municip, ND at 00:00Z on 2010-06-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -14 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
279 J/kg
Mixed-layer CIN
-250 J/kg
Mixed-layer LCL
1509 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
-14 m²/s²
0-3 km storm-relative helicity
34 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

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 21, 8:34 PM MDT, 8 minutes earlier.

Area forecast discussion, Jun 21, 8:34 PM MDT, 8 minutes before
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Hazardous weather outlook, Jun 21, 2:25 PM MDT, 6 hours 17 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
225 PM MDT MON JUN 21 2010

MTZ028>042-056>058-063>068-WYZ098-099-222030-
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-
225 PM MDT MON JUN 21 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

A COLD FRONT WILL PUSH THROUGH THE FORECAST AREA THIS AFTERNOON
THROUGH THIS EVENING. THUNDERSTORMS WILL DEVELOP ALONG THIS
FRONT. SOME OF THESE STORMS MAY BECOME SEVERE FROM BILLINGS EAST
AND SOUTHEAST. LARGE HAIL...DAMAGING WINDS AND VERY HEAVY RAIN WILL
BE THE PRIMARY THREATS THROUGH THIS EVENING. MUCH OF THE AREA HAS
RECENTLY RECEIVED SIGNIFICANT RAINFALL. ADDITIONAL RAINFALL WILL
QUICKLY RUN OFF AND MAY LEAD TO FLASH FLOODING.

STAY TUNED TO LOCAL MEDIA FOR ANY SEVERE WEATHER WARNINGS OR FLASH
FLOOD WARNINGS INTO TONIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Local storm report, Jun 21, 7:45 PM MDT, 57 minutes before
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Local storm report, Jun 21, 7:50 PM MDT, 52 minutes before
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Local storm report, Jun 21, 7:56 PM MDT, 46 minutes before
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Local storm report, Jun 21, 8:02 PM MDT, 40 minutes before
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Local storm report, Jun 21, 8:13 PM MDT, 29 minutes before
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Local storm report, Jun 21, 8:32 PM MDT, 10 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 21, 6:13 PM MDTSpecial Weather StatementBYZPowder River62 min
Jun 21, 6:22 PM MDTTornado WarningBYZPowder River23 min
Jun 21, 6:28 PM MDTTornado WarningBYZRosebud17 min
Jun 21, 6:29 PM MDTTornado WarningBYZPowder River, Rosebud31 min
Jun 21, 6:41 PM MDTSevere Thunderstorm WarningBYZBig Horn, Yellowstone39 min
Jun 21, 6:43 PM MDTTornado WarningBYZPowder River32 min
Jun 21, 6:48 PM MDTTornado WarningBYZPowder River27 min
Jun 21, 7:07 PM MDTSpecial Weather StatementBYZRosebud53 min
Jun 21, 7:16 PM MDTTornado WarningBYZPowder River29 min
Jun 21, 7:16 PM MDTTornado WarningBYZPowder River29 min
Jun 21, 7:20 PM MDTSevere Thunderstorm WarningBYZCuster, Rosebud55 min
Jun 21, 7:31 PM MDTTornado WarningBYZRosebud29 min
Jun 21, 7:46 PM MDTTornado WarningBYZPowder River29 min
Jun 21, 7:48 PM MDTTornado WarningBYZPowder River27 min
Jun 21, 7:58 PM MDTTornado WarningBYZCuster, Rosebud32 min
Jun 21, 8:14 PM MDTTornado WarningBYZCarter, Powder River31 min
Jun 21, 8:15 PM MDTFlash Flood WarningBYZCarter, Powder River6 hr
Jun 21, 8:21 PM MDTSevere Thunderstorm WarningBYZCarter, Powder River54 min
Jun 21, 8:28 PM MDTTornado WarningBYZCuster22 min
Jun 21, 8:37 PM MDTTornado WarningBYZCarter, Powder River23 min
Jun 21, 9:00 PM MDTSevere Thunderstorm WarningBYZCarter60 min
Jun 21, 9:16 PM MDTTornado WarningBYZCarter14 min
Jun 21, 9:58 PM MDTSevere Thunderstorm WarningBYZCarter32 min
Jun 22, 2:23 PM MDTSpecial Weather StatementBYZBig Horn52 min
Jun 22, 2:40 PM MDTSevere Thunderstorm WarningBYZBig Horn65 min
Jun 22, 2:49 PM MDTFlash Flood WarningBYZBig Horn3 hr
Jun 22, 4:05 PM MDTSevere Thunderstorm WarningBYZBig Horn55 min
Jun 22, 4:18 PM MDTSpecial Weather StatementBYZPowder River57 min
Jun 22, 4:54 PM MDTSpecial Weather StatementBYZMusselshell66 min
Jun 22, 5:13 PM MDTSevere Thunderstorm WarningBYZCarter62 min
Jun 22, 5:29 PM MDTFlash Flood WarningBYZCarter3 hr
Jun 22, 2:27 PM MDTSpecial Weather StatementBYZSheridan63 min
Jun 22, 2:36 PM MDTSevere Thunderstorm WarningBYZSheridan54 min
Jun 22, 3:35 PM MDTSpecial Weather StatementBYZSheridan55 min
Jun 22, 4:32 PM MDTFlash Flood WarningBYZSheridan3 hr

Nearby

Tornado Warnings in Montana, 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.