Area Forecast Discussion
Issued by NWS Riverton, WY

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000
FXUS65 KRIW 040521
AFDRIW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
1021 PM MST WED FEB 3 2016

.SHORT TERM...TONIGHT THROUGH THURSDAY (ISSUED AT 230 PM MST)

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.../06Z ISSUANCE/

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

MVFR CONDITIONS WILL OCCUR IN NW WY OVERNIGHT BUT NOT IMPACT KJAC
TERMINAL SITE UNTIL AFTER 11Z. VFR CONDITIONS ELSEWHERE THROUGH 12Z.

SNOW WILL DEVELOP OVER THE WESTERN MOUNTAINS BY 12Z AND CONTINUE
THROUGH 06Z FRIDAY. EXPECT MVFR/IFR CONDITIONS AND MOUNTAIN
OBSCURATION. 12Z THURS THROUGH 06Z FRI...FROM KJAC TO KAFO...
PERIODS OF SNOW WILL OCCUR WITH MVFR CIGS/VSBYS AND LOCAL IFR
CONDITIONS.

IN SW WY AFTER 12Z CLOUDS WILL BE LOWERING WITH SCATTERED SNOW
DEVELOPING BY 18Z. AFTER 18Z THURS THROUGH 06Z FRI SCATTERED AREAS
OF SNOW WITH MVFR CIGS/VSBYS. TERMINAL SITES IN SW WY WILL BE
IMPACTED AT TIMES. PLEASE SEE INDIVIDUAL TERMINAL FORECASTS FOR MORE
DETAILS.

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

VFR CONDITIONS WILL PREVAIL THROUGH THE PERIOD. SCATTERED SNOW
SHOWERS WILL DEVELOP AFTER 22Z THURS AND CONTINUE TO THROUGH 06Z
FRI. SOME MVFR CONDITIONS WILL OCCUR IN PLACES. TERMINAL SITES MAY
SEE A SNOW SHOWER WHICH WOULD PRODUCE MVFR CONDITIONS. THE BIGHORN
MOUNTAINS WILL SEE SNOW SHOWERS AFTER 18Z THURS THROUGH 06Z FRIDAY
WITH MVFR/IFR CONDITIONS AND MOUNTAIN OBSCURATION.

&&

.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 UNTIL 11 AM MST THURSDAY FOR
WYZ019-020-022-030.

HIGH WIND WARNING UNTIL 2 PM MST THURSDAY FOR WYZ003.

&&

$$

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


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