High Wind Warning 8, NWS Riverton, WY

000 
WWUS75 KRIW 280033
NPWRIW

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
633 PM MDT SAT MAY 27 2006

...THE HIGH WIND WARNING HAS BEEN CANCELLED...

.GUSTY SOUTHERLY WINDS HAVE SWITCHED TO THE WEST EARLY THIS
EVENING AS A COLD FRONT HAS SWEPT ACROSS CENTRAL WYOMING. THIS HAS
BROUGHT AN END TO THE THREAT OF DAMAGING WIND.

WYZ017>019-280145-
/O.CAN.KRIW.HW.W.0008.000000T0000Z-060528T0200Z/
WIND RIVER BASIN-LANDER FOOTHILLS-
GREEN MOUNTAINS AND RATTLESNAKE RANGE-
INCLUDING THE CITIES OF...RIVERTON...SHOSHONI...LANDER...
JEFFREY CITY
633 PM MDT SAT MAY 27 2006

...HIGH WIND WARNING IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS CANCELLED THE HIGH
WIND WARNING.

THE PASSAGE OF A STRONG COLD FRONT HAS DIMINISHED THE GUSTY
SOUTHERLY WIND OF EARLIER THIS AFTERNOON. A PEAK WIND SPEED OF 63
MPH WAS RECORDED AT HUNT FIELD IN LANDER AT 211 PM. AT RIVERTON
REGIONAL AIRPORT THE OBSERVED PEAK WIND WAS 52 MPH AT 316 PM. IN THE
WAKE OF THE COLD FRONT...WEST TO NORTHWEST WIND OF 20 TO 30 MPH
WILL BE COMMON UNTIL AROUND MIDNIGHT.

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
358 AM MDT SAT MAY 27 2006

.SHORT TERM...TODAY THROUGH MONDAY NIGHT
AN ACTIVE SHORT TERM IN STORE ACROSS WESTERN AND CENTRAL WYOMING
THIS HOLIDAY WEEKEND. CLOUD TOPS CONTINUE TO COOL DRAMATICALLY
ACROSS CENTRAL IDAHO THIS MORNING AS A JET STREAK DRIVES A SHORTWAVE
OUT OF THE BASE OF A POSITIVELY TILTED TROF. RAIN SHOWERS AS
INDICATED BY KPIH 88D...WILL CONTINUE TO SHIFT EAST INTO FAR WESTERN
ZONES THIS MORNING AS THE BAROCLINIC BOUNDARY SLIPS EAST.
INITIALLY...SNOW LEVELS WILL BE AROUND 10000 FEET THIS MORNING...BUT
WILL STEADILY DECREASE AS THE AFTERNOON PROGRESSES. AS A RESULT...
PRECIPITATION WILL BEGIN AS RAIN ACROSS MOST LOCATIONS THIS MORNING.
BY THIS AFTERNOON...SNOW LEVELS DROP TO AROUND 8000 FEET ACROSS
YELLOWSTONE NATIONAL PARK AND THE ABSAROKA MOUNTAINS. THIS LEVEL WILL
DESCEND TO THE WESTERN VALLEY FLOORS OVERNIGHT. SNOW AMOUNTS WILL
REMAIN LIGHT IN THE WESTERN VALLEYS. HOWEVER...YELLOWSTONE NATIONAL
PARK AND THE ABSAROKAS...PARTICULARLY NEAR BEARTOOTH PASS WILL SEE
HIGHER AMOUNTS.  AT THIS POINT...3 TO 6 INCHES IS ANTICIPATED TO BE
THE AVERAGE ACROSS MOST OF YELLOWSTONE NATIONAL PARK...WITH UP TO 9
INCHES IN THE BEARTOOTH MOUNTAINS. ALTHOUGH SNOW ADVISORY THRESHOLD
WILL BE MARGINAL...GIVEN THE TIME OF YEAR AND INFLUX OF
RECREATIONALISTS INTO NORTHWEST WYOMING...HAVE OPTED TO HOIST A SNOW
ADVISORY FOR YELLOWSTONE NATIONAL PARK AND THE ABSAROKA MOUNTAINS.
ANOTHER AREA OF CONCERN WILL BE FIRE WEATHER POTENTIAL ACROSS
SOUTHERN WYOMING...WHERE POOR RECOVERY THIS MORNING...WILL COMBINE
WITH STRONG PREFRONTAL SURFACE WINDS...FOR RED FLAG CONDITIONS. SO...
HAVE ALSO ISSUED A RED FLAG WARNING FOR FIRE WEATHER ZONE 277 FROM 10
AM THROUGH 8 PM.  THE COLD FRONT WILL PUSH THROUGH THE REMAINDER OF
THE FORECAST AREA LATE THIS AFTERNOON THROUGH THIS EVENING. SO...
SHOWERS WILL BE POSSIBLE ANYWHERE TONIGHT...HOWEVER BEST CHANCES FOR
SIGNIFICANT WILL BE CONFINED TO WEST AND NORTHWESTERN MOUNTAINS.
SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS THE ENTIRE AREA ON
SUNDAY...AS COLD POOL SWINGS OVERHEAD. SUNDAY WILL BE THE COOLEST DAY
OF THE SHORT TERM WITH TEMPERATURES 20 TO 30 DEGREES COLDER THAN WHAT
WAS EXPERIENCED THE LAST FEW DAYS. DRIER AIR BEGINS TO WORK INTO THE
AREA ON MONDAY...GRADUALLY REDUCING PRECIPITATION CHANCES ACROSS THE
CWFA...WITH ONLY SLIGHT CHANCE IN MOUNTAIN LOCATIONS.

LONG TERM...TUESDAY THROUGH SATURDAY
TROUGH AXIS REMAINS TO OUR WEST TO START THE MEDIUM RANGE PERIOD
WITH THE MODELS VARYING ON WHETHER THERE WILL BE ONE OR TWO
SHORTWAVES THAT MOVE THROUGH THE AREA TUESDAY INTO WEDNESDAY BEFORE
RIDGING STARTS TO DEVELOP. WILL HIT TUESDAY THE HARDEST STILL BUT
WILL ADD MORE COVERAGE TO WEDNESDAYS FORECAST. HAVE EXPANDED THE
CHANCE POPS ON TUESDAY TO INCLUDE ALL THE WESTERN AND NORTHERN
MOUNTAINS...FOOTHILL LOCATIONS AND ADJACENT LOWER ELEVATIONS IN A
FEW SPOTS. IF THE ECMWF IDEA VERIFIES BETTER...WE MAY NEED TO
INCREASE OUR WEDNESDAY THUNDERSTORM COVERAGE. RIDGING IS STILL
FORECAST TO BUILD IN THURSDAY THROUGH THE WEEKEND WITH WARMING
TEMPERATURES...ESPECIALLY FRIDAY INTO SATURDAY. WILL KEEP THIS
ENTIRE PERIOD DRY AND WAIT TO SEE IF EVENTUAL MOISTURE TRIES TO
SNEAK UP AROUND THE PERIPHERY OF THE RIDGE.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...SNOW ADVISORY IN EFFECT FROM NOON
TODAY THROUGH 6 AM SUNDAY FOR ZONES 1>2.

RED FLAG WARNING IN EFFECT FROM 10 AM TODAY THROUGH 8 PM THIS
EVENING FOR FIRE WEATHER ZONE 277.

&&

SHORT TERM...HAHN
LONG TERM...SKRBAC

HAZARDOUS WEATHER OUTLOOK...RETRANSMISSION
NATIONAL WEATHER SERVICE RIVERTON WY
402 AM MDT SAT MAY 27 2006

WYZ001>020-022>030-281100-
ABSAROKA MOUNTAINS-BIGHORN MOUNTAINS SOUTHEAST-
BIGHORN MOUNTAINS WEST-CASPER MOUNTAIN-CODY FOOTHILLS-
EAST SWEETWATER COUNTY-FLAMING GORGE-
GREEN MOUNTAINS AND RATTLESNAKE RANGE-JACKSON HOLE-LANDER FOOTHILLS-
NATRONA COUNTY LOWER ELEVATIONS-NORTH BIG HORN BASIN-
NORTHEAST JOHNSON COUNTY-OWL CREEK AND BRIDGER MOUNTAINS-
ROCK SPRINGS AND GREEN RIVER-SALT RIVER AND WYOMING RANGES-
SOUTH LINCOLN COUNTY-SOUTHEAST BIG HORN BASIN-
SOUTHEAST JOHNSON COUNTY-SOUTHWEST BIG HORN BASIN-STAR VALLEY-
TETON AND GROS VENTRE MOUNTAINS-UPPER GREEN RIVER BASIN-
UPPER GREEN RIVER BASIN FOOTHILLS-UPPER WIND RIVER BASIN-
WIND RIVER BASIN-WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST-
YELLOWSTONE NATIONAL PARK-
402 AM MDT SAT MAY 27 2006

...SNOW ADVISORY IN EFFECT FOR THE NORTHWEST MOUNTAINS THIS
AFTERNOON THROUGH TONIGHT...

...RED FLAG WARNING IN EFFECT FOR SOUTHERN WYOMING LATE THIS MORNING
THROUGH THIS EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT
A STRONG STORM SYSTEM WILL CONTINUE TO MOVE THROUGH THE STATE
TODAY AND TONIGHT. SHOWERS AND A FEW THUNDERSTORMS WILL BE ON THE
INCREASE ACROSS WESTERN WYOMING TODAY...SPREADING INTO CENTRAL
WYOMING TONIGHT. INITIALLY SNOW LEVELS WILL BE AROUND 10000 FEET.
HOWEVER...SNOW LEVELS WILL DESCEND THROUGH THE DAY. VERY LITTLE SNOW
ACCUMULATION IS ANTICIPATED IN THE JACKSON AND STAR VALLEYS WITH UP
TO AN INCH OR TWO ON GRASSY SURFACES. HOWEVER...3 TO 6 INCHES ARE
POSSIBLE ACROSS YELLOWSTONE NATIONAL PARK...WITH UP TO 9 INCHES ON
BEARTOOTH PASS. TEMPERATURES WILL COOL DRAMATICALLY TONIGHT AND
SUNDAY...WITH SUNDAY HIGH TEMPERATURES 20 TO 30 DEGREES COOLER THAN
THIS PAST WEEK.

IN ADDITION...VERY LOW RELATIVE HUMIDITIES AND STRONG SOUTH WINDS
WILL BE PRESENT ACROSS SOUTHERN WYOMING TODAY. THIS WILL RESULT IN
THE POSSIBILITY FOR EXTREME FIRE CONDITIONS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH SATURDAY

SHOWERS AND THUNDERSTORMS WILL CONTINUE ON SUNDAY AND SUNDAY NIGHT.
THE MAIN HAZARDS FROM THIS ACTIVITY WILL BE FREQUENT CLOUD TO
GROUND LIGHTNING AND SMALL HAIL.

SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT SNOW REPORTS TODAY AND TONIGHT.
THANK YOU.

HAHN