High Wind Watch 14, NWS Riverton, WY

948 
WWUS75 KRIW 130824
NPWRIW

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
224 AM MDT TUE MAR 13 2012

...VERY STRONG WINDS EXPECTED OVER THE GREEN MOUNTAINS AND
RATTLESNAKE RANGES THROUGH THIS EVENING...

.AN INCREASING SURFACE PRESSURE GRADIENT WILL COMBINE WITH VERY
STRONG SOUTHWEST WINDS ABOVE THE SURFACE TO PRODUCE HIGH WINDS
THROUGH THIS EVENING.

WYZ019-132200-
/O.UPG.KRIW.HW.A.0014.120313T1200Z-120314T0600Z/
/O.NEW.KRIW.HW.W.0014.120313T1200Z-120314T0600Z/
GREEN MOUNTAINS AND RATTLESNAKE RANGE-
INCLUDING THE CITY OF...JEFFREY CITY
224 AM MDT TUE MAR 13 2012

...HIGH WIND WARNING IN EFFECT FROM 6 AM THIS MORNING TO MIDNIGHT
MDT TONIGHT...

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A HIGH WIND
WARNING...WHICH IS IN EFFECT FROM 6 AM THIS MORNING TO MIDNIGHT
MDT TONIGHT. THE HIGH WIND WATCH IS NO LONGER IN EFFECT. 


* SUMMARY AND TIMING...SOUTHWEST WIND WILL INCREASE TODAY ACROSS
  THE AREA AND CONTINUE THROUGH THIS EVENING.

* WIND...SOUTHWEST 30 TO 40 MPH WITH GUSTS OVER 60 MPH POSSIBLE.

* IMPACTS...THOSE TRAVELING IN HIGH PROFILE VEHICLES AND TOWING
  LIGHT TRAILERS WILL BE PARTICULARLY SUSCEPTIBLE TO STRONG CROSS
  WINDS. AREAS IMPACTED INCLUDE BEAVER RIM TO SWEETWATER STATION
  AND ALONG U.S. HIGHWAY 287 AND STATE HIGHWAY 220 FROM SWEETWATER
  STATION THROUGH JEFFREY CITY...MUDDY GAP...AND ALCOVA.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED
OR OCCURRING. SUSTAINED WIND SPEEDS OF AT LEAST 40 MPH OR GUSTS
OF 58 MPH OR MORE CAN LEAD TO PROPERTY DAMAGE. 

THE LATEST ROAD CONDITIONS PROVIDED BY THE WYOMING DEPARTMENT OF
TRANSPORTATION ARE AVAILABLE BY CALLING 5-1-1 OR ON THE INTERNET
AT WYOROAD.INFO.

&&

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
1236 PM MDT MON MAR 12 2012

.SHORT TERM...TODAY THROUGH WEDNESDAY NIGHT

A WEAK SHORTWAVE TROUGH IS PRODUCING VERY LIGHT SNOW IN THE WESTERN
MOUNTAINS EARLY THIS MORNING.  SNOW TOTALS SHOULD BE AN INCH OR TWO
IN THE MOUNTAINS WITH LESS THAN AN INCH IN STAR VALLEY AND JACKSON
HOLE.  A BRIEF PERIOD OF RIDGING WILL DEVELOP IN THE WAKE OF THE
WAVE BRINGING A BREAK IN THE LIGHT SNOW IN THE WEST.  TEMPERATURES
EAST OF THE CONTINENTAL DIVIDE SHOULD BE SLIGHTLY COOLER TODAY THAN
SUNDAY BUT STILL SEASONABLY WARM AS BREEZY TO WINDY CONDITIONS WILL
HELP KEEP THE BOUNDARY LAYER MIXED.  A TROUGH OFF THE BRITISH
COLUMBIA COAST WILL SEND ANOTHER SHORTWAVE OUR WAY TUESDAY BUT
MODELS HAVE TRENDED FARTHER NORTH WITH THIS FEATURE AND NOW ARE ONLY
DELIVERING A GLANCING BLOW TO NORTHWEST WYOMING LATE TUESDAY AND
WEDNESDAY MORNING.  MILD AND DRY CONDITIONS WILL CONTINUE EAST OF
THE DIVIDE THROUGH WEDNESDAY AS MODERATE SOUTHWEST FLOW KEEPS 0 TO
-4C H7 AIR MIXING DOWN TO THE SURFACE.

.LONG TERM...THURSDAY THROUGH MONDAY

DEEP SOUTHWEST FLOW WILL OCCUR THURSDAY AND FRIDAY ACROSS THE
FORECAST AREA...WITH THE FLOW BECOMING STRONGER ON FRIDAY AS A
LONGWAVE TROUGH BEGINS TO TAKE SHAPE ACROSS THE WEST.  THIS WILL
RESULT IN UNSEASONABLY WARM TEMPERATURES AND BREEZY
CONDITIONS...ESPECIALLY ACROSS THE WIND CORRIDORS ON FRIDAY. EAST OF
THE DIVIDE WILL REMAIN DRY...BUT WEST OF THE DIVIDE WILL SEE A
CHANCE OF PRECIPITATION BOTH DAYS...WITH A BETTER CHANCE ON FRIDAY.
TEMPERATURE PROFILES OVER THE WEST SUGGEST THE PRECIPITATION WILL
MAINLY BE RAIN IN THE VALLEYS...BUT SNOW IN THE MOUNTAINS.

GLOBAL MODELS DIFFER SIGNIFICANTLY ABOUT A SHORTWAVE TROUGH AHEAD OF
THE MAIN DIGGING TROUGH FRIDAY NIGHT/SATURDAY. THE GFS AND GEM SHOW VARYING
DEGREES OF THIS SHORTWAVE...HELPING SLIDE A COLD FRONT ACROSS THE
AREA FRIDAY NIGHT/SATURDAY...WHILE THE ECMWF IS MUCH SHARPER WITH
THE MAIN TROUGH BY FRIDAY...AND THUS DOES NOT SEND THIS INITIAL
SHORTWAVE OR ITS ASSOCIATED COLD FRONT THROUGH THE AREA. THIS
WOULD KEEP AREAS EAST OF THE DIVIDE DRIER AND MUCH WARMER SATURDAY THAN
WHAT THE GFS OR GEM SOLUTIONS WOULD INDICATE.

MODELS THEN AGREE SOMEWHAT...THAT AS THE MAIN TROUGH SLOWLY PULLS
ACROSS THE WEST SUNDAY AND MONDAY...A COLD FRONT SHOULD PUSH
ACROSS THE AREA SUNDAY/SUNDAY NIGHT...WITH A CHANCE OF
PRECIPITATION ACROSS THE ENTIRE AREA SUNDAY AND MONDAY.

DUE TO THE UNCERTAINTY OF ALL OF THESE FEATURES...WILL BROAD BRUSH
MAINLY LOW POPS ACROSS THE ENTIRE AREA SATURDAY THROUGH
MONDAY...WITH A BETTER SHOT ACROSS THE WEST.

WELL ABOVE AVERAGE TEMPERATURES ARE EXPECTED THURSDAY AND
FRIDAY...BUT SEASONAL TO SLIGHTLY BELOW AVERAGE TEMPERATURES ARE
EXPECTED IN WAKE OF A COLD FRONT OR TWO NEXT WEEKEND.

&&

.AVIATION.../18Z ISSUANCE/

WIDESPREAD VFR CONDITIONS EXPECTED ACROSS THE AREA. A WEAK
DISTURBANCE WILL MOVE THROUGH WESTERN WYOMING TONIGHT. THIS WILL
BRING SOME STRONGER WIND ALOFT...WITH SOME LLWS POSSIBLE OVER KJAC
AFTER 06Z. THIS CONTINUES TO BE MONITORED FOR INCLUSION WITH THE
00Z TAF SET. OTHERWISE...WIND WILL BEGIN TO INCREASE EAST OF THE
DIVIDE LATE IN THE FORECAST PERIOD...WITH MORE IMPACT EXPECTED
AFTER 18Z TUESDAY.

&&

.FIRE WEATHER...

LIGHT SNOW WILL CONTINUE OVER NORTHWEST WYOMING THIS MORNING WITH
DRYING EXPECTED IN THE AFTERNOON. EAST OF THE DIVIDE...BREEZY TO
WINDY CONDITIONS ARE EXPECTED FOR THE NEXT FEW DAYS AS MODERATE
SOUTHWEST FLOW ALOFT MIXED TO THE SURFACE.  LOW RH VALUES WILL
ACCOMPANY THE WARM AND BREEZY CONDITIONS.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

SHORT TERM...BERC
LONG TERM...WM
AVIATION...BRANHAM
FIRE WEATHER...BERC

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
400 AM MDT MON MAR 12 2012

WYZ001>020-022>030-131200-
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-
400 AM MDT MON MAR 12 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

TUESDAY...STRONG WINDS POSSIBLE THROUGH THE WIND CORRIDOR FROM SOUTH
PASS TO CASPER.

FRIDAY AND SATURDAY...SIGNIFICANT WESTERN MOUNTAIN SNOWFALL
POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT ANY FLOODING. THANK YOU.

TEAM RIVERTON