Area Forecast Discussion
Issued by NWS Riverton, WY

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000
FXUS65 KRIW 052142
AFDRIW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
242 PM MST FRI FEB 5 2016

.SHORT TERM...TONIGHT THROUGH SATURDAY

MOISTURE EMBEDDED IN THE NORTHWEST FLOW WILL CONTINUE LIGHT SNOWFALL
OVER THE WESTERN MOUNTAINS AND VALLEYS TONIGHT. A PACIFIC WAVE WILL
THEN APPROACH THE AREA SATURDAY MORNING...SENDING INCREASED MOISTURE
OVER WESTERN WYOMING. YELLOWSTONE AND TETON COUNTIES LOOK TO BE THE
MOST IMPACTED BY THIS UPCOMING SNOWFALL....THOUGH ACCUMULATIONS
THROUGH SATURDAY AFTERNOON ARE LOOKING TO GENERALLY BE LESS THAN 3
INCHES OVER THE MOUNTAINS AND LESS THAN AN INCH ACROSS THE VALLEYS.

THE BIGGER STORY THROUGH THE FORECAST PERIOD IS WIND. A NOTICEABLE
TEMPERATURES GRADIENT REMAINS OVER THE CODY FOOTHILLS WITHIN THEIR
FAVORED FLOW FOR MOUNTAIN WAVE ACTIVITY. IT IS ANTICIPATED THAT
STRONG WIND WILL MAKE IT TO THE SURFACE THIS EVENING AND CONTINUE
THROUGH THE OVERNIGHT HOURS BEFORE WEAKENING. THEN...A TIGHTENED
PRESSURE GRADIENT ACROSS THE STATE WILL INCREASE WIND ACROSS THE
CORRIDOR BETWEEN ROCK SPRINGS AND CASPER. THE STRONGEST WINDS LOOK
TO BE OVER NATRONA AND SOUTHEASTERN FREMONT COUNTIES...THOUGH LOCAL
HIGH WIND WILL ALSO BE POSSIBLE ACROSS EASTERN SWEETWATER COUNTY
THROUGH THE EVENING HOURS. HIGH WIND WARNINGS HAVE BEEN ISSUED FOR
BOTH LOCATIONS...AND THE STATEMENTS WILL CONTAIN BETTER TIMING AND
INTENSITY INFORMATION.

.LONG TERM...SATURDAY NIGHT THROUGH FRIDAY

LIMITED MOISTURE IN NORTHWEST FLOW ALOFT WILL BRING SOME LIGHT
SNOW TO THE NORTHERN AND WESTERN MOUNTAINS SATURDAY NIGHT.  EAST OF
THE CONTINENTAL DIVIDE...VARIABLE CLOUDS WITH BREEZY TO WINDY AREAS
CAN BE EXPECTED.  THE WINDIEST AREAS WILL BE ALONG AND NEAR THE EAST
SLOPES OF THE MOUNTAINS.  THE SNOW SHOWERS WILL LINGER OVER THE
NORTHWEST SUNDAY MORNING THEN ARE EXPECTED TO DISSIPATE. CLEARING IS
EXPECTED ACROSS THE AREA SUNDAY AND SUNDAY NIGHT.  A WEAK COLD FRONT
WILL MOVE SOUTH FROM MONTANA BRINGING SOME COOLING TO MAINLY THE
NORTH AND EAST.  SOME STRATUS AND FOG WILL LIKELY GET TRAPPED IN THE
WESTERN VALLEYS AND CENTRAL BASINS WITH AREAS OF FOG ALONG THE LAKES
AND RIVERS. HIGH PRESSURE ALOFT OVER THE WESTERN US WILL DOMINATE
THE WEATHER MONDAY THROUGH FRIDAY WITH A PROLONGED DRY PERIOD
EXPECTED.  OUTSIDE OF SOME VALLEY AND BASIN STRATUS AND FOG AT NIGHT
AND EARLY MORNING HOURS...MOSTLY CLEAR CONDITIONS ARE EXPECTED.
WINDS SHOULD PICK UP WEDNESDAY AND THURSDAY ACROSS THE SOUTHWEST AND
EAST OF THE CONTINENTAL DIVIDE.  TEMPERATURES WILL WARM IN THE WINDY
AREAS AND LOW TEMPERATURES WILL BE THE MAIN FORECAST CHALLENGE IN
THE EXTENDED FORECAST.  SOME LIGHT SNOW SHOWERS MAY DEVELOP LATE
THURSDAY NIGHT AND FRIDAY IN THE NORTHWEST...OTHERWISE FRIDAY WILL
BE DRY AS WELL...AND SHOULD BE THE WINDIEST DAY OVERALL.


&&

.AVIATION.../00Z ISSUANCE/


WEST OF THE CONTINENTAL DIVIDE...KBPI/KJAC/KPNA/KRKS

PERIODS OF SNOWFALL WILL BE POSSIBLE OVER THE WESTERN
MOUNTAINS....AND INTO THE EXTREME WESTERN VALLEYS THROUGH THE
PERIOD. THIS MAY PRODUCE PERIODS OF LIGHT SNOWFALL AND MVFR
CONDITIONS AT KJAC. CONDITIONS LOOK MOST FAVORABLE FOR SNOWFALL
AFTER 12Z SATURDAY...WHEN SOME IFR CONDITIONS MAY BE REPORTED.
ADDITIONALLY...PERIODS OF GUSTY WIND WILL BE POSSIBLE OVER KRKS
THROUGH MUCH OF THE FORECAST PERIOD. GUSTY WIND MAY ALSO ACCOMPANY
SNOWFALL OVER THE WESTERN MOUNTAINS AFTER 12Z SATURDAY...WHICH
MAY IMPACT THE WESTERN MOUNTAIN PASSES. MOUNTAIN TOPS WILL LIKELY
REMAIN OBSCURED THROUGH MUCH OF THE FORECAST PERIOD.

EAST OF THE CONTINENTAL DIVIDE...KCOD/KCPR/KLND/KRIW/KWRL

STRONG WIND WILL BE FOUND OVER THE NORTHERN PORTION OF THE AREA
TONIGHT...WITH GUSTS TO 35 KTS POSSIBLE AT KCOD AFTER 00Z.
STRONGER GUSTS TO 50 KTS WILL BE POSSIBLE SOUTH AND NORTH OF KCOD
WHICH MAY IMPACT APPROACHES AND DEPARTURES. PERIODS OF GUSTY WIND
WILL ALSO BE POSSIBLE OVER KCPR...WITH GUSTS TO 35KT POSSIBLE
AFTER 08Z THIS EVENING. ANOTHER INCREASE IN WIND OVER THE EASTERN
TERMINALS WILL BE EXPECTED AFTER 16Z SATURDAY...WITH SOME GUSTS
NEAR 50 KT ANTICIPATED AROUND KCPR. THE STRONGER WIND MAY BE
CLOSER TO CASPER MOUNTAIN...WHICH COULD MAKE FOR SOME INCREASED
TURBULENCE ON APPROACH OF THE TERMINAL. PRECIPITATION WILL
GENERALLY REMAIN WEST OF THE DIVIDE WITH VFR CONDITIONS
ANTICIPATED.

&&

.FIRE WEATHER...

STRONG WIND TO BE THE MAIN CONCERN OVER TONIGHT AND THROUGH
SATURDAY. HIGH WIND WARNINGS HAVE BEEN ISSUED FOR THE CODY FOOTHILLS
AND ACROSS THE WIND CORRIDOR BETWEEN ROCK SPRINGS AND CASPER.
OTHERWISE...PERIODS OF SNOWFALL ARE ANTICIPATED OVER THE WESTERN
MOUNTAINS AND VALLEYS THROUGH SATURDAY NIGHT. A BUILDING RIDGE IS
THE ANTICIPATED OVER THE AREA THROUGH MUCH OF THE NEXT WEEK. A
SLIGHT WARMING TREND IS ANTICIPATED.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
HIGH WIND WARNING FROM 5 AM TO 11 PM MST SATURDAY FOR WYZ019-020.

HIGH WIND WARNING FROM 5 PM THIS AFTERNOON TO 8 AM MST SATURDAY
FOR WYZ003.

&&

$$

SHORT TERM...BRANHAM
LONG TERM...C.BAKER
AVIATION...BRANHAM
FIRE WEATHER...BRANHAM


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