Area Forecast Discussion
Issued by NWS Riverton, WY

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FXUS65 KRIW 180524
AFDRIW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
1024 PM MST MON NOV 17 2014

.SHORT TERM...TONIGHT THROUGH TUESDAY (ISSUED AT 140 PM MST)

WARMING IN THE MID LEVELS WILL LEAD TO STEEPENING INVERSIONS FOR
THE WESTERN AND CENTRAL BASINS AND VALLEYS TONIGHT AND TUESDAY
MORNING. SEE NO REASON WHILE LOW CLOUDS AND FOG WILL NOT RETURN TO
THE FAR WEST VALLEYS AND LIKELY DEVELOP OR EXPAND IN THE LOW LYING
SPOTS ALONG THE BIGHORN BASIN...NORTH OF RIVERTON AND EVEN IN THE
NORMAL AREA OVER NWRN SWEETWATER COUNTY AND FAR SRN SUBLETTE
COUNTY. LOWERED LOWS AND HIGHS IN THESE AREAS AND WILL DO SOME
LAST MINUTE TWEAKING BASED ON HOW WE LOOK LATER THIS AFTERNOON.
WIND CORRIDOR SHOULD SEE INCREASING WINDS LATER TONIGHT THROUGH
TUESDAY. THE CODY FOOTHILLS WILL ALSO SEE DEVELOPING GAP FLOW
WHICH WILL PLAY HAVOC WITH OVERNIGHT LOWS. SOME AREAS LIKE CODY
WILL LIKELY SEE AN EVENING LOW WITH RISING TEMPERATURES AFTER THE
WIND KICKS IN. THE CLOSER TO THE FOOTHILLS THE WARMER IT WILL BE
WITH ANY LULLS IN THE WIND AWAY FROM THE FOOTHILLS RESULTING IN
RAPID TEMPERATURE DROPS. WEAK SYSTEM OVER NRN B.C. WILL MOVE
QUICKLY SWD AND CLIP OUR NERN ZONES LATE TUESDAY WITH SOME MID AND
HIGH CLOUDS AND MAYBE A FEW MTN FLURRIES IN THE NRN BIGHORN MTNS.
WEAK SURFACE REFLECTION WILL LIKELY KICK UP THE WINDS IN NRN
JOHNSON COUNTY TOMORROW AFTERNOON. OTHERWISE...WARMER IN THE WINDY
AND MTN AREAS AND LITTLE CHANGE TO A TAD WARMER ELSEWHERE.

.LONG TERM...TUESDAY NIGHT THROUGH MONDAY

HIGH PRESSURE AND GENERALLY DRY CONDITIONS START OFF THE FORECAST
PERIOD. SOME INVERSIONS WILL KEEP TEMPERATURES A BIT COOLER THAN
GUIDANCE HAS...BUT A WARMING TREND IS STILL ANTICIPATED. THE DRY
TREND WILL CONTINUE INTO THURSDAY MORNING.

A WEAK DISTURBANCE MAY THEN IMPACT NORTHWESTERN WYOMING...SPREADING
SOME LIGHT SHOWER ACTIVITY ACROSS THE AREA THURSDAY AFTERNOON AND
EVENING. THE AREA OF LOW PRESSURE ASSOCIATED WITH THIS SYSTEM IS
EXPECTED TO SPLIT AS IT APPROACHES THE INTERMOUNTAIN WEST. LIGHT
ACTIVITY WILL REMAIN POSSIBLE ACROSS THE EXTREME NORTHWEST...WITH
THE GREATER BULK OF ACTIVITY EXPECTED TO MOVE SOUTH OF THE FORECAST
AREA. A BRIEF TRANSITORY RIDGE IS THEN EXPECTED BY FRIDAY NIGHT
ACROSS THE AREA.

THE NEXT APPROACHING WINTRY SYSTEM WILL MOVE OFF THE PACIFIC COAST
LATE FRIDAY...WITH SHOWER ACTIVITY REACHING INTO EXTREME WESTERN
WYOMING BY SATURDAY MORNING. A WAVE OF LOW PRESSURE WILL DEEPEN AS
IT APPROACHES THE STATE SATURDAY AFTERNOON...WITH PRECIPITATION
SPREADING TO INCLUDE MUCH OF THE AREA WEST OF THE DIVIDE. ACTIVITY
WILL SPREAD EAST OF THE CONTINENTAL DIVIDE SATURDAY NIGHT. MOISTURE
WILL REMAIN ACROSS THE AREA FOR THE NEXT FEW DAYS...WITH PERIODS OF
SHOWERS ANTICIPATED INTO THE EARLY PORTION OF NEXT WEEK.

A GENERAL WARMING TREND IS ANTICIPATED THROUGH SATURDAY...WITH A
COOLING TEMPERATURES THEN LASTING INTO THE BEGINNING OF NEXT WEEK.

&&

.AVIATION.../06Z ISSUANCE/

VFR CONDITIONS WILL PREVAIL THROUGH TUESDAY IN MOST AREAS. THE
EXCEPTION WILL BE IN THE FAR WEST VALLEYS AND BASINS WHERE
CONSIDERABLE LOW CLOUDS AND PATCHY FOG WILL DEVELOP OVERNIGHT AND
LAST THROUGH MUCH OF TUESDAY MORNING. LOW LYING AREAS IN CENTRAL
WYOMING WILL ALSO SEE AREAS OF LOW CLOUDS AND PATCHY FOG...
ESPECIALLY IN LOW LYING AREAS IN THE BIGHORN BASIN AND AROUND BOYSEN
RESERVOIR NORTH OF RIVERTON. BREEZY TO WINDY CONDITIONS WILL OCCUR
OVERNIGHT THROUGH SUNSET TUESDAY IN THE FAVORED WIND LOCATIONS...
INCLUDING KCOD...KCPR AND KRKS.

&&

.FIRE WEATHER...

INVERSIONS WILL HOLD ACROSS THE FAR WEST VALLEYS AND IN THE LOW
LYING BASIN AREAS IN CENTRAL WYOMING THE NEXT SEVERAL DAYS. BETTER
MIXING WILL OCCUR IN THE NORMALLY WINDY AREAS AT TIMES FROM KRKS
TO KCPR...ALONG THE CODY FOOTHILLS AND EAST SLOPE OF THE MOUNTAINS.
IT WILL REMAIN DRY THROUGH MIDWEEK EXCEPT FOR A FEW MOUNTAIN
FLURRIES AROUND THE BIGHORN MOUNTAINS LATE TUESDAY OR TUESDAY NIGHT.

&&

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

&&

$$

SHORT TERM...SKRBAC
LONG TERM...BRANHAM
AVIATION...AR
FIRE WEATHER...SKRBAC





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