Alert archive / Montana / Special Weather Statements in 2009

Special Weather Statement, NWS Billings, MT

August 7, 2009Stillwater County, Montana

NWS Billings, MT issued this special weather statement at Aug 7, 2009, 4:13 PM MDT for Stillwater County, Montana. It was in force for 77 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 7, 2009, 4:13 PM MDT (22:13 UTC)
Expired
Aug 7, 2009, 5:30 PM MDT
In force
77 min
Issued by
NWS Billings, MT

County Stillwater County, MT

The radar

The Billings radar (KBLX), 37 km from the middle of the area, began a volume at 22:12 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

Great_falls, MT (KTFX), launched 12:00Z, 10.2 hours before the alert went out and 221 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 2009-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2009-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
593 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
46 m²/s²
0-3 km storm-relative helicity
166 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 7, 2:38 PM MDT, 1 hour 35 minutes earlier.

Area forecast discussion, Aug 7, 2:38 PM MDT, 1 hour 35 minutes before
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Hazardous weather outlook, Aug 7, 2:42 PM MDT, 1 hour 31 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
242 PM MDT FRI AUG 7 2009

MTZ028>042-056>058-063>068-WYZ098-099-082045-
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-
242 PM MDT FRI AUG 7 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
MONTANA...SOUTH CENTRAL MONTANA...SOUTHEAST MONTANA AND NORTH
CENTRAL WYOMING.

.DAY ONE...TONIGHT

THUNDERSTORMS ARE LIKELY THROUGH TONIGHT AS A STRONG LOW PRESSURE
SYSTEM MOVES THROUGH THE ROCKIES. A FEW STORMS COULD TURN SEVERE
WITH LARGE HAIL AND DAMAGING WINDS. HEAVY RAINFALL AND FREQUENT
LIGHTNING CAN ALSO BE EXPECTED. PONDING OF WATER ON ROADWAYS AND
IN LOW LYING AREAS MAY OCCUR WITH HEAVIER RAINFALL.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

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

Special weather statement, Aug 7, 2:33 PM MDT, 1 hour 40 minutes before
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Special weather statement, Aug 7, 3:40 PM MDT, 33 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BILLINGS MT
340 PM MDT FRI AUG 7 2009

MTZ028-042-063-072230-
GOLDEN VALLEY MT-JUDITH GAP MT-SOUTHERN WHEATLAND MT-
340 PM MDT FRI AUG 7 2009

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL GOLDEN VALLEY AND
SOUTHEASTERN WHEATLAND COUNTIES UNTIL 430 PM MDT...

AT 336 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 5 MILES WEST OF DEADMANS BASIN RESERVOIR...OR
JUST SOUTH OF SHAWMUT...MOVING NORTHEAST AT 15 MPH.

PENNY SIZE HAIL...HEAVY RAIN AND FREQUENT LIGHTNING IS EXPECTED WITH
THIS STORM...WHICH WILL AFFECT TRAVEL ALONG HIGHWAY 12 BETWEEN
SHAWMUT AND RYEGATE.

LAT...LON 4667 10938 4650 10907 4621 10951 4631 10971
TIME...MOT...LOC 2136Z 218DEG 12KT 4632 10953
Special weather statement, Aug 7, 3:40 PM MDT, 33 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BILLINGS MT
340 PM MDT FRI AUG 7 2009

MTZ039-072300-
EASTERN CARBON MT-
340 PM MDT FRI AUG 7 2009

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL CARBON COUNTY UNTIL 500
PM MDT...

AT 332 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORMS 14 MILES SOUTH OF BRIDGER...OR 20 MILES EAST
OF RED LODGE...MOVING NORTHEAST AT 10 MPH.

THESE STORMS WERE PRODUCING VERY HEAVY RAIN WHICH WILL LIKELY CAUSE
SMALL STREAMS SOUTH OF BRIDGER TO RISE INCLUDING SILVER TIP CREEK.
PONDING OF WATER ALONG HIGHWAYS 295 AND 310 AND IN LOW LYING AREAS
IS ALSO POSSIBLE THROUGH THE REMAINDER OF THE AFTERNOON.

LAT...LON 4530 10895 4530 10885 4500 10877 4499 10878
      4499 10896 4499 10903
TIME...MOT...LOC 2133Z 207DEG 8KT 4509 10886
Special weather statement, Aug 7, 3:43 PM MDT, 30 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BILLINGS MT
343 PM MDT FRI AUG 7 2009

MTZ038-072245-
SOUTHERN BIG HORN MT-
343 PM MDT FRI AUG 7 2009

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL BIG HORN COUNTY UNTIL 445
PM MDT...

AT 342 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 19 MILES SOUTHEAST OF FORT SMITH...OR 40 MILES
NORTHWEST OF SHERIDAN...MOVING NORTHEAST AT 10 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER IS EXPECTED WITH THIS
STORM...ALONG WITH HEAVY RAIN AND FREQUENT LIGHTNING.

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 4545 10757 4531 10724 4500 10759 4510 10781
TIME...MOT...LOC 2143Z 238DEG 7KT 4512 10764
Special weather statement, Aug 7, 4:13 PM MDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BILLINGS MT
413 PM MDT FRI AUG 7 2009

MTZ034-072330-
NORTHERN STILLWATER MT-
413 PM MDT FRI AUG 7 2009

...SIGNIFICANT WEATHER ADVISORY FOR STILLWATER COUNTY UNTIL 530 PM
MDT...

AT 405 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SEVERAL SLOW MOVING THUNDERSTORMS OVER STILLWATER COUNTY...EXTENDING
FROM JUST EAST OF RAPELJE TO NEAR COLUMBUS AND ABSAROKEE. ONE
PARTICULAR STORM LOCATED NORTH OF INTERSTATE 90 BETWEEN COLUMBUS AND
PARK CITY WAS REMAINING STATIONARY. VERY HEAVY RAIN CAN BE EXPECTED
IN THESE AREAS THROUGH 530 PM MDT. SMALL HAIL AND WIND GUSTS TO 40
MPH ARE ALSO POSSIBLE.

PEOPLE SHOULD BE ALERT TO PONDING OF WATER ON ROADWAYS AND THE
POTENTIAL FOR RAPID WATER RUNOFF ASSOCIATED WITH THESE THUNDERSTORMS.

LAT...LON 4598 10891 4559 10903 4557 10908 4558 10912
      4555 10913 4547 10935 4611 10922 4612 10892
TIME...MOT...LOC 2205Z 185DEG 4KT 4572 10907

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 6, 6:41 PM MDTSpecial Weather StatementBYZCarbon64 min
Aug 6, 7:05 PM MDTSpecial Weather StatementBYZYellowstone55 min
Aug 6, 7:52 PM MDTSpecial Weather StatementBYZYellowstone53 min
Aug 6, 8:01 PM MDTSpecial Weather StatementBYZBig Horn59 min
Aug 6, 9:07 PM MDTSpecial Weather StatementBYZRosebud, Treasure53 min
Aug 6, 11:04 PM MDTSpecial Weather StatementBYZCuster56 min
Aug 7, 12:12 AM MDTSpecial Weather StatementBYZPrairie48 min
Aug 7, 2:33 PM MDTSpecial Weather StatementBYZWheatland57 min
Aug 7, 3:40 PM MDTSpecial Weather StatementBYZGolden Valley50 min
Aug 7, 3:43 PM MDTSpecial Weather StatementBYZBig Horn62 min
Aug 7, 4:15 PM MDTFlash Flood WatchBYZBig Horn, Carbon, Carter, Custer, Fallon, Golden Valley and 6 more6 hr
Aug 7, 4:27 PM MDTSevere Thunderstorm WarningBYZBig Horn63 min
Aug 7, 4:37 PM MDTFlash Flood WarningBYZStillwater114 min
Aug 7, 4:50 PM MDTSpecial Weather StatementBYZYellowstone40 min
Aug 7, 5:00 PM MDTSevere Thunderstorm WarningBYZBig Horn30 min
Aug 7, 5:26 PM MDTSpecial Weather StatementBYZYellowstone94 min
Aug 7, 5:26 PM MDTSevere Thunderstorm WarningBYZBig Horn, Rosebud64 min
Aug 7, 5:35 PM MDTSevere Thunderstorm WarningBYZMusselshell, Yellowstone55 min
Aug 7, 5:47 PM MDTSevere Thunderstorm WarningBYZBig Horn, Rosebud58 min
Aug 7, 5:49 PM MDTSevere Thunderstorm WarningBYZSheridan56 min

Nearby

Special Weather Statements in Montana, 2009Every special weather statement in 2009

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.