Special Weather Statement, NWS Billings, MT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
252 PM MDT MON MAR 26 2012

.SHORT TERM...VALID FOR TUE AND WED...

STRONG COLD FRONT BEGINNING TO DEVELOP OVER SOUTHWEST MONTANA WITH
COMPLEX ENVIRONMENT IN PLACE OVER SOUTHERN MONTANA AND NORTHERN
WYOMING. SOUTHEAST MONTANA SEEING SOUTHEASTERLY FLOW AND HIGHER
DEWPOINTS ADVECTING INTO THE AREA WITH MILES CITY SEEING A
DEWPOINT AROUND 43. FURTHER WEST...DEEP MIXING AND SUNSHINE HAS
ALLOWED A FEW SPOTS TO BREAK OUT WITH THE SUNSHINE AND
SOUTHWESTERLY WIND AND DEWPOINTS ARE IN THE 20S AND OR LOWER WITH
TEMPERATURES IN THE 70S. THUNDERSTORMS DEVELOPING OVER GALLATIN
COUNTY AND PARK AND BIG HORN COUNTIES IN WYOMING AND FURTHER SOUTH
IN WYOMING OUTFLOW WINDS HAVE PRODUCED WIND GUSTS IN EXCESS OF 60
MPH. EXPECT THE COLD FRONT TO BE A HYBRID OF FRONTAL PUSH
SUPPORTED BY THUNDERSTORM OUTFLOW COLD POOL AS IT PUSHES THROUGH
THE CENTRAL ZONES WITH 60 MPH WIND GUSTS LIKELY AS IT PUSHES
THROUGH THE CENTRAL ZONES. EXPECT THIS TO OCCUR AROUND BILLINGS
NEAR 5 PM WITH SOME LIGHTNING ACTIVITY POSSIBLE SO FOLKS RUNNING
OUTDOOR SPORTS PRACTICES SHOULD BE WATCHING THE WEATHER. DO NOT
EXPECT SIGNIFICANT MOISTURE WITH THE FRONT BUT EXPECT SOME SHOWER
ACTIVITY BEHIND THE FRONT BECOMING MORE NUMEROUS AS THE FRONT
MOVES INTO SOUTHEAST MONTANA WHERE DEEPER MOISTURE EXISTS.

FRONT ACCELERATES AS IT MOVES THROUGH SOUTHEAST MONTANA AND
SURFACE LOW DEEPENS OVER THE DAKOTAS AND THIS MAINTAINS THE WINDS
OVER SOUTHEAST MONTANA THROUGH THE NIGHT AND INTO EARLY TUESDAY.
HAVE ISSUED HIGH WIND WARNING FOR THE CENTRAL PORTION OF THE
REGION AND WILL UPGRADE THE HIGH WIND WATCH TO A WARNING AND THE
EXPIRATION TIME WILL BE NOON TOMORROW THOUGH EXPECT WINDS TO TAPER
OFF BEFORE THEN. TUESDAY WILL BE A BIT COOLER BUT DRIER AIR SLIDES
INTO THE REGION SO PRECIPITATION WILL DISSIPATE AND SKIES WILL BE
SUNNY.

SOUTHWEST FLOW ALOFT MOVES INTO THE REGION FROM WEST TO EAST ON
WEDNESDAY AS ANOTHER SHORTWAVE TRACKS INTO THE PACIFIC NORTHWEST.
THIS WILL ALLOW FOR WINDS TO FAVOR A DOWNSLOPE WIND DIRECTION AND
BRING MIXING AND WARMER TEMPERATURES THOUGH AN INCREASE IN CLOUD
COVER. SHOULD START TO SEE SOME SHOWER ACTIVITY WEDNESDAY NIGHT
BUT THIS DOES NOT LOOK TO BE MUCH OF A MOISTURE MAKER. BORSUM

.LONG TERM...VALID FOR THU...FRI...SAT...SUN...MON...

LITTLE IN THE WAY OF CHANGES AS MODELS REMAIN IN PRETTY GOOD
AGREEMENT THROUGH EARLY SUNDAY. MODELS DIVERGE IN THEIR SOLUTIONS
SUNDAY INTO MONDAY.

THURSDAY...A WEAK COLD FRONT WASHES OUT AS RIDGING AND SOUTHWEST
FLOW ALOFT BUILD BACK INTO THE REGION AHEAD OF ANOTHER SHORTWAVE
TROUGH. TEMPS AT 850 MB REBOUND BACK TO NEAR 10C...SO ANOTHER MILD
MARCH DAY IS ON TAP.

SHORTWAVE ENERGY WITH PACIFIC MOISTURE BRUSHES THE WESTERN THIRD OF
THE CWA FRIDAY IN SOUTHWEST FLOW ALOFT. AS IT DOES SO...ADDITIONAL
LIFT VIA THE MOUNTAINS AND DAYTIME HEATING WILL HELP GENERATE
SHOWERS ACROSS THE WEST. TEMPS WILL AGAIN BE MILD TO WARM ACROSS
THE AREA WITH 850 MB TEMPS WELL INTO THE MID TEENS.

RIDGING BEGINS TO BREAK DOWN SATURDAY AFTERNOON AS A STRONG
FRONT...SUPPORTED BY A DEEP TROUGH...MOVES INTO THE REGION FROM
THE WEST. WITH 850 MB TEMPS INTO THE MID TO UPPER TEENS...IT WILL
BE QUITE WARM. AS TEMPS IN THE MID LEVELS COOL WITH THE APPROACH
OF THE UPPER LEVEL TROUGH...IT WILL BECOME INCREASING UNSTABLE...SO
OPTED TO INCLUDE A MENTION OF THUNDERSTORMS ACROSS THE WEST. THE
FRONT SWEEPS THROUGH THE REGION SATURDAY NIGHT INTO EARLY SUNDAY
WITH MUCH COOLER AIR...STRONG NORTHWEST WINDS AND SCATTERED RAIN
AND SNOW SHOWERS.

DID NOT MAKE MANY CHANGES TO SUNDAY/MONDAY TIMEFRAME AS MODEL
SOLUTIONS ARE NOT WELL-ALIGNED. THE GFS WRAPS UP A DEEP LOW WITH
PRECIP ACROSS EASTERN MONTANA SUNDAY INTO EARLY MONDAY...FOLLOWED
BY SHORTWAVE ENERGY MOVING INTO THE REGION FROM THE NORTHWEST.
DURING THE SAME TIME...THE ECMWF QUICKLY PULLS THE SYSTEM
NORTHEASTWARD INTO CANADA...WHILE BUILDING A RIDGE SUNDAY
AFTERNOON INTO MONDAY. STC

&&

.AVIATION...

A STRONG STORM SYSTEM WILL BRING SHOWERS AND THUNDERSTORMS TO THE
REGION OVER THE NEXT SEVERAL HOURS...ALONG WITH INCREASINGLY
STRONG SOUTH TO SOUTHWEST WINDS. THERE MAY BE SOME SMALL HAIL
ALONG WITH GUSTY ERRATIC WINDS IN SOME OF THE THUNDERSTORMS. AS
THE STORM SYSTEM MOVES THROUGH THE REGION THIS EVENING INTO
TONIGHT...EXPECT WINDS TO BECOME WEST TO NORTHWESTERLY AND REMAIN
STRONG. SCATTERED SHOWERS WILL DISSIPATE BY LATE TONIGHT. THERE
WILL BE MOUNTAIN OBSCURATIONS THROUGH TONIGHT. MOSTLY VFR
CONDITIONS WITH SOMEWHAT WEAKER WINDS ARE EXPECTED TUESDAY. STC

&&

.PRELIMINARY POINT TEMP/POPS...

    TUE     WED     THU     FRI     SAT     SUN     MON
-----------------------------------------------------------
BIL 041/064 038/069 040/066 041/068 044/071 039/055 033/051
    60/U    01/B    21/B    02/W    11/B    32/W    32/W
LVM 038/058 036/064 037/060 038/062 039/066 036/049 027/047
    30/B    02/W    22/W    22/W    23/T    33/W    22/W
HDN 036/065 037/073 037/070 038/073 041/073 039/060 031/053
    60/U    01/B    11/B    02/W    10/B    33/W    32/W
MLS 042/063 035/072 039/068 041/072 042/074 040/061 033/054
    72/W    01/B    11/B    01/B    11/B    22/W    22/W
4BQ 040/063 036/073 038/069 040/074 041/077 040/062 034/051
    51/N    01/B    11/B    01/B    10/B    22/W    32/W
BHK 041/060 035/069 039/065 039/070 042/073 040/061 036/052
    83/W    01/B    11/B    11/B    10/B    22/W    32/W
SHR 034/061 034/070 036/066 038/070 039/072 035/057 031/048
    30/U    01/B    11/B    11/B    11/B    23/W    43/W

&&

.BYZ WATCHES/WARNINGS/ADVISORIES...
MT...HIGH WIND WARNING IN EFFECT UNTIL MIDNIGHT MDT TONIGHT FOR
      ZONES 28>31-34-35-38-39-42-57-58-63.
     HIGH WIND WARNING IN EFFECT FROM 6 PM THIS EVENING TO NOON
      MDT TUESDAY FOR ZONES 32-33-36-37.
     RED FLAG WARNING IN EFFECT UNTIL 6 AM MDT TUESDAY FOR ZONES
      130>133.
WY...HIGH WIND WARNING IN EFFECT UNTIL MIDNIGHT MDT TONIGHT FOR
      ZONE 99.
     RED FLAG WARNING IN EFFECT UNTIL 6 AM MDT TUESDAY FOR ZONE
      274.

&&

WEATHER.GOV/BILLINGS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
251 PM MDT MON MAR 26 2012

MTZ028>042-056>058-063>068-WYZ098-099-272100-
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-
251 PM MDT MON MAR 26 2012

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 STRONG COLD FRONT WILL MOVE THROUGH THE REGION LATE THIS
AFTERNOON AND EVENING. SHOWERS AND SOME THUNDERSTORMS WILL DEVELOP
ALONG AND AHEAD OF THE FRONT...WITH STRONG WEST WINDS BEHIND THE
FRONT. EXPECT WIND GUSTS OF 50 TO 60 MPH...WITH THE STRONGEST
GUSTS NEAR THE SHOWER AND THUNDERSTORM ACTIVITY. STRONG WINDS WILL
PERSIST IN EASTERN AREAS FROM MILES CITY TO BAKER THROUGH THE
NIGHT AND INTO EARLY TUESDAY. PEOPLE WITH OUTDOOR INTERESTS OR
TRAVEL PLANS SHOULD BE PREPARED FOR STRONG WINDS.

.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.

JKL

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BILLINGS MT
557 PM MDT MON MAR 26 2012

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

0550 PM     TSTM WND GST     5 NW ACTON              45.98N 108.76W
03/26/2012  M58 MPH          YELLOWSTONE        MT   TRAINED SPOTTER

&&

JKL

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BILLINGS MT
603 PM MDT MON MAR 26 2012

MTZ029-035-042-270100-
GOLDEN VALLEY MT-MUSSELSHELL MT-YELLOWSTONE MT-
603 PM MDT MON MAR 26 2012

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN GOLDEN VALLEY...
CENTRAL YELLOWSTONE AND SOUTHERN MUSSELSHELL COUNTIES UNTIL 700 PM
MDT...

A COLD FRONT ALONG WITH AN AREA OF SHOWERS AND THUNDERSTORMS WILL
PRODUCE WEST TO NORTHWEST WIND GUSTS OF 45 TO 60 MPH ACROSS THE AREA
THROUGH 7 PM MDT. THIS INCLUDES BILLINGS...HUNTLEY AND SHEPHERD. AT
6 PM... DOPPLER RADAR INDICATED THE STRONGEST STORM WAS NEAR
BROADVIEW...MOVING WEST AT 20 MPH. THIS STORM IS EXPECTED TO REMAIN
NORTH OF BILLINGS AND WILL PRODUCE BRIEF HEAVY RAIN AND POSSIBLY
SOME SMALL HAIL.

LAT...LON 4605 10775 4589 10790 4589 10805 4579 10805
      4578 10807 4569 10809 4568 10850 4601 10893
      4613 10892 4613 10909 4630 10931 4656 10848
TIME...MOT...LOC 2359Z 238DEG 22KT 4623 10904 4585 10845

SPECIAL WEATHER STATEMENT...CORRECTED
NATIONAL WEATHER SERVICE BILLINGS MT
605 PM MDT MON MAR 26 2012

MTZ029-035-042-270115-
GOLDEN VALLEY MT-MUSSELSHELL MT-YELLOWSTONE MT-
605 PM MDT MON MAR 26 2012

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN GOLDEN VALLEY...
CENTRAL YELLOWSTONE AND SOUTHERN MUSSELSHELL COUNTIES UNTIL 700 PM
MDT...

A COLD FRONT ALONG WITH AN AREA OF SHOWERS AND THUNDERSTORMS WILL
PRODUCE WEST TO NORTHWEST WIND GUSTS OF 45 TO 60 MPH ACROSS THE AREA
THROUGH 7 PM MDT. THIS INCLUDES BILLINGS...HUNTLEY AND SHEPHERD. AT
6 PM... DOPPLER RADAR INDICATED THE STRONGEST STORM WAS NEAR
BROADVIEW...MOVING EAST AT 20 MPH. THIS STORM IS EXPECTED TO
REMAIN NORTH OF BILLINGS AND WILL PRODUCE BRIEF HEAVY RAIN AND
POSSIBLY SOME SMALL HAIL.

LAT...LON 4605 10775 4589 10790 4589 10805 4579 10805
      4578 10807 4569 10809 4568 10850 4601 10893
      4613 10892 4613 10909 4630 10931 4656 10848
TIME...MOT...LOC 2359Z 238DEG 22KT 4623 10904 4585 10845

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BILLINGS MT
621 PM MDT MON MAR 26 2012

MTZ038-057-270115-
NORTHERN BIG HORN MT-SOUTHERN BIG HORN MT-
621 PM MDT MON MAR 26 2012

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN BIG HORN COUNTY UNTIL
715 PM MDT...

A SURGE OF STRONG NORTHWEST WINDS ASSOCIATED WITH A COLD FRONT WILL
MOVE THROUGH HARDIN AND CROW AGENCY BETWEEN 630 PM AND 730 PM MDT.
EXPECT GUSTS OF 45 TO 60 MPH IN THESE AREAS. TRAVEL ON INTERSTATE 90
WILL BE IMPACTED BY THESE STRONG WINDS.

LAT...LON 4552 10806 4590 10803 4590 10789 4593 10789
      4593 10784 4595 10783 4594 10720 4543 10719
TIME...MOT...LOC 0018Z 220DEG 11KT 4577 10776

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BILLINGS MT
621 PM MDT MON MAR 26 2012

MTZ032-270115-
CUSTER MT-
621 PM MDT MON MAR 26 2012

...SIGNIFICANT WEATHER ADVISORY FOR CUSTER COUNTY UNTIL 715 PM MDT...

AT 617 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
AN AREA OF SHOWERS AND THUNDERSTORMS 30 MILES SOUTH OF MILES
CITY...MOVING NORTH AT 35 MPH.

WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THESE STORMS...ALONG WITH
OCCASIONAL DANGEROUS LIGHTNING.

THIS STORM WILL BE NEAR...
GARLAND AROUND 630 PM MDT.
MILES CITY AROUND 705 PM MDT.

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

A HIGH WIND WARNING IS IN EFFECT FOR CUSTER COUNTY THROUGH TONIGHT.

LAT...LON 4655 10605 4646 10523 4579 10542 4584 10617
TIME...MOT...LOC 0020Z 190DEG 20KT 4599 10586