Area Forecast Discussion
Issued by NWS Riverton, WY

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000
FXUS65 KRIW 032130
AFDRIW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
230 PM MST WED FEB 3 2016

.SHORT TERM...TONIGHT THROUGH THURSDAY

WINDS WILL INCREASE ACROSS THE AREA TONIGHT AHEAD OF A PACIFIC
LOW PRESSURE TROUGH MOVING INLAND ALONG THE WEST COAST. MOISTURE
WILL BE LIMITED BUT SHOULD PRODUCE LIGHT SNOW OVER THE WESTERN
MOUNTAINS WITH LIGHT ACCUMULATIONS. CLOUD COVER WILL HELP MODERATE
TEMPERATURES IN THE WEST WHILE THE STRONG DOWNSLOPE WINDS WILL
ALSO PRODUCE WARMING. THE WIND ALONG THE EAST SLOPES OF THE
ABSAROKA MOUNTAINS IN THE CODY FOOTHILLS EXPECTED TO REACH HIGH
WIND CRITERIA TONIGHT AND MUCH OF THE DAY THURSDAY IN THE CODY
FOOTHILLS WHERE A HIGH WIND WARNING IS IN EFFECT. THE WIND
CORRIDOR ACROSS SWEETWATER...SOUTHERN FREMONT AND NATRONA COUNTIES
WELL COVERED IN SNOW IS EXPECTED TO SEE STRONG WINDS DEVELOP THIS
EVENING AND A WINTER WEATHER ADVISORY IS IN EFFECT THERE THROUGH
THURSDAY MORNING FOR BLOWING SNOW. TEMPERATURES WILL BE ON THE COLD
SIDE EVEN WITH SOME WARMING OCCURRING.

.LONG TERM...THURSDAY NIGHT THROUGH WEDNESDAY

THE TROUGH WHICH IS EXPECTED TO PRODUCE GUSTY WIND WITH ADDITIONAL
LIGHT SNOW THURSDAY AFTERNOON WILL CONTINUE TO MOVE THROUGH THE AREA
THURSDAY EVENING. SOME LINGERING MOISTURE WILL BRING LIGHT SNOWFALL
ACROSS THE WESTERN MOUNTAINS AND VALLEYS ON FRIDAY. BUILDING HIGH
PRESSURE WILL HELP TO CEASE SNOW ACTIVITY BY FRIDAY EVENING OTHER
THAN NORTHWESTERN WYOMING.

ANOTHER WAVE WILL APPROACH WESTERN WYOMING SATURDAY
AFTERNOON...PRODUCING SNOWFALL ACROSS THE NORTHWESTERN MOUNTAINS.
THIS SYSTEM WILL SPREAD TO INCLUDE PORTIONS EAST OF THE CONTINENTAL
DIVIDE BY LATE SATURDAY EVENING...THOUGH COVERAGE VARIES IN CURRENT
MODEL SOLUTIONS.

PASSAGE OF THIS SYSTEM BY SUNDAY MORNING WILL PERMIT A RETURN OF
RIDGING. SOME COOLER TEMPERATURES WILL BE POSSIBLE IN THE WAKE OF
THE WAVE ON SUNDAY...BUT DRY CONDITIONS WITH A SLIGHT WARMING TREND
ARE THEN EXPECTED THROUGH WEDNESDAY.

&&

.AVIATION.../00Z ISSUANCE/

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

VFR CONDITIONS EXPECTED THROUGH 09Z THURSDAY. AFTER 09Z MVFR TO
IFR CEILINGS WILL BECOME MORE AND MORE WIDESPREAD OVER THE
MOUNTAINS AS A PACIFIC LOW PRESSURE TROUGH SPREADS MOISTURE EAST
INTO WESTERN WYOMING. AREAS OF LIGHT SNOW WILL DEVELOP AS WELL.
MVFR TO IFR CEILINGS AND VISIBILITY REDUCED IN SNOW AND FOG WILL
LOWER INTO THE WESTERN VALLEYS AROUND 12Z THURSDAY WITH KJAC AND
KAFO MOST LIKELY TO HAVE IFR CONDITIONS. KBPI...KEMM AND KPNA MAY
SEE MVFR CEILINGS AFTER 15Z THURSDAY AS THE MOISTURE SPREADS EAST.
WEST TO SOUTHWEST WINDS WILL INCREASE AFTER 12Z THURSDAY WITH
AREAS OF LOW LEVEL WIND SHEAR POSSIBLE OVER AND NEAR THE
MOUNTAINS.

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

VFR CONDITIONS ARE EXPECTED TO PREVAIL AT THE AIRPORTS EAST OF THE
CONTINENTAL DIVIDE THROUGH 00Z FRIDAY. ALONG AND EAST OF THE
CONTINENTAL DIVIDE IN THE MOUNTAINS ABOVE 8500 FEET EXPECT IFR TO
MVFR CEILINGS TO DEVELOP AFTER 12Z THURSDAY WITH AREAS OF LIGHT
SNOW AND FOG OBSCURING MOUNTAINS. ALONG AND NEAR THE EAST SLOPES
OF THE MOUNTAINS AREAS OF LOW LEVEL WIND SHEAR WILL BE
ENCOUNTERED...INCREASING AFTER 12Z THURSDAY.

&&

.FIRE WEATHER...

WINDS WILL INCREASE ACROSS THE AREA TONIGHT AHEAD OF A PACIFIC
LOW PRESSURE TROUGH MOVING INLAND ALONG THE WEST COAST. MOISTURE
WILL BE LIMITED BUT SHOULD PRODUCE LIGHT SNOW OVER THE WESTERN
MOUNTAINS WITH LIGHT ACCUMULATIONS. CLOUD COVER WILL HELP MODERATE
TEMPERATURES IN THE WEST WHILE THE STRONG DOWNSLOPE WINDS WILL
ALSO PRODUCE WARMING. THE WIND ALONG THE EAST SLOPES OF THE
ABSAROKA MOUNTAINS IN THE CODY FOOTHILLS EXPECTED TO REACH HIGH
WIND CRITERIA TONIGHT AND MUCH OF THE DAY THURSDAY IN THE CODY
FOOTHILLS WHERE A HIGH WIND WARNING IS IN EFFECT. THE WIND
CORRIDOR ACROSS SWEETWATER...SOUTHERN FREMONT AND NATRONA COUNTIES
WELL COVERED IN SNOW IS EXPECTED TO SEE STRONG WINDS DEVELOP THIS
EVENING AND A WINTER WEATHER ADVISORY IS IN EFFECT THERE THROUGH
THURSDAY MORNING FOR BLOWING SNOW. TEMPERATURES WILL BE ON THE COLD
SIDE AND RELATIVE HUMIDITY WILL BE ELEVATED. MIXING HEIGHTS WILL
BE LOW WITH GENERALLY POOR SMOKE DISPERSAL. SOME OF THE WINDIER
AREAS MAY SEE FAIR TO LOW END GOOD SMOKE DISPERSAL THURSDAY
AFTERNOON.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
WINTER WEATHER ADVISORY FROM 5 PM THIS AFTERNOON TO 11 AM MST
THURSDAY FOR WYZ019-020-022-030.

HIGH WIND WARNING FROM 5 PM THIS AFTERNOON TO 2 PM MST THURSDAY
FOR WYZ003.

&&

$$

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


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