Area Forecast Discussion
Issued by NWS Riverton, WY

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000
FXUS65 KRIW 302130
AFDRIW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
230 PM MST FRI JAN 30 2015

.SHORT TERM...TONIGHT THROUGH SATURDAY

A WARM PACIFIC LOW OVER THE FOUR CORNERS AREA THIS
AFTERNOON...CONTINUES TO STREAM HIGH CLOUDS ACROSS THE COWBOY
STATE. LOW CLOUDS HAVE MADE THEIR WAY INTO THE I-80 CORRIDOR NEAR
KRKS...WHILE THE RAIN SHOWERS REMAIN WELL TO THE SOUTH IN NE
UT/NW CO. THESE SHOWERS WILL SLOWLY MAKE THEIR WAY NORTHWARD THIS
EVENING. TEMPERATURES ARE EXPECTED TO BE AT OR BELOW FREEZING BY
THIS TIME...PRODUCING LIGHT SNOW SHOWERS ACROSS SWEETWATER COUNTY.
ACCUMULATIONS ARE EXPECTED TO REMAIN LIGHT THROUGH MID MORNING
SATURDAY.

FOG CONTINUES TO HOLD ON OVER NORTHERN PORTIONS OF THE BIGHORN
BASIN...DESPITE THE CLOUDS ALOFT. FOG WILL BEGIN TO FILL IN
FURTHER SOUTH TOWARD KWRL DURING THE OVERNIGHT HOURS. FOG SHOULD
LIFT OUT BY MID MORNING...AS SKIES BEGIN TO CLEAR ACROSS THE AREA.

A COLD FRONT WILL BEGIN TO IMPACT NORTHERN PORTIONS LATE SATURDAY
AFTERNOON...BRINGING LOW CLOUDS AND GUSTY WINDS TO JOHNSON COUNTY.
LIGHT SNOW SHOWERS WILL BE POSSIBLE IN THE BIGHORNS.

.LONG TERM...SATURDAY NIGHT THROUGH FRIDAY NIGHT

THE SHORTWAVE MOVING THROUGH NORTHEASTERN WYOMING SATURDAY NIGHT
WILL HAVE SOME IMPACT OVER THE EASTERN PORTION OF THE FORECAST AREA
THROUGH SUNDAY MORNING. LIGHT SHOWER ACTIVITY IS EXPECTED.

BUILDING NORTHWEST FLOW THEN EXPECTED SUNDAY AFTERNOON AND EVENING
AS A RIDGE OF HIGH PRESSURE BUILDS OFF THE PACIFIC COAST. THIS
SYSTEM WILL BRING SOME MOISTURE INTO NORTHWESTERN WYOMING EARLY
MONDAY MORNING...MAINLY IMPACTING WESTERN AND NORTHERN WYOMING.

ANOTHER...MORE SIGNIFICANT PUSH OF MOISTURE WILL FOLLOW THAT SYSTEM
QUICKLY...WITH PRECIPITATION SPREADING INTO WESTERN WYOMING MONDAY
EVENING. ACTIVITY FROM THIS SYSTEM WILL LINGER THROUGH WEDNESDAY AS
ANOTHER PUSH COMES DOWN FROM THE NORTH AS WELL. THE ACTIVITY WILL
SPREAD TO INCLUDE MUCH OF THE FORECAST AREA. MODELS HAVE SOME
VARIATIONS ON THIS SYSTEM...WITH THE GFS REMAINING THE MOST
AGGRESSIVE MODEL. HOWEVER...ALL MODELS ARE IN FAIR AGREEMENT THAT
COVERAGE WILL INCREASE THROUGH WEDNESDAY MORNING.

CONDITIONS TO IMPROVE WEDNESDAY AFTERNOON AND EVENING. A BUILDING
RIDGE WILL HELP TO CLEAR OUT ACTIVITY...THOUGH SOME VERY LIGHT
ACTIVITY MAY REMAIN POSSIBLE ACROSS THE NORTHWEST THROUGH THURSDAY
AFTERNOON. DRY CONDITIONS EXPECTED BY FRIDAY MORNING...WHICH MAY NOT
LAST LONG.

&&

.AVIATION.../00Z ISSUANCE/

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

VFR CONDITIONS WILL PREVAIL THIS EVENING...WITH FOG LINGERING IN
THE BIGHORN BASIN NEAR KGEY. FOG WILL SPREAD THROUGHOUT THE
NIGHT...REACHING KWRL BY 10Z SATURDAY. N-NE SFC WINDS WILL
PREVAIL ACROSS THE AREA...WITH SOME LOWER CIGS EXPECTED ALONG THE
EAST SLOPES OF THE DIVIDE AND OTHER UPSLOPE FAVORED AREAS. MOST OF
THESE CIGS ARE EXPECTED TO REMAIN VFR...OBSCURING HIGHER MTNS.
CLEARING IS EXPECTED AFTER 12Z SATURDAY...WITH IMPROVING
CONDITIONS FROM NORTH TO SOUTH THROUGH THE DAY. THIS WILL BE
SHORT-LIVED...AS A COLD FRONT BEGINS TO IMPACT KCOD-KWRL WITH MVFR
CONDITIONS BY 23Z SATURDAY.

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

AN UPPER LEVEL LOW PRESSURE SYSTEM OVER THE FOUR CORNERS...WILL
CONTINUE TO PUSH UP MOISTURE INTO SOUTHERN WYOMING THROUGH THE
PERIOD...WITH CIGS EXPECTED TO GRADUALLY LOWER VCNTY AND SOUTH OF
INTERSTATE 80...WITH SOME ISOLD TO SCT -SHSN MOVING IN EARLY THIS
EVENING ALONG WITH LOCAL MVFR/IFR CONDITIONS. MVFR/IFR CONDITIONS ARE
EXPECTED TO BECOME MORE PREVALENT IN THIS AREA AFTER 00Z SATURDAY.
VFR CONDITIONS WILL RETURN TO THESE AREAS AFTER 15Z
SATURDAY...WITH INCREASING WESTERLY WINDS OF 15 TO 25 MPH BY 21Z.

NORTH OF INTERSTATE 80...VFR CONDITIONS WILL PREVAIL THROUGH THE
PERIOD.

&&

.FIRE WEATHER...

FIRE DANGER IS LOW FOR ALL AREAS...AND WILL REMAIN SO THROUGH NEXT
WEEK. MEASURABLE PRECIPITATION WILL NOT FALL ACROSS THE FORECAST
AREA UNTIL LATE SATURDAY INTO SUNDAY MORNING EAST OF THE DIVIDE.
FROM SUNDAY NIGHT THROUGH THE NEXT WORK WEEK...A SERIES OF
DISTURBANCES WILL RIDE THROUGH THE REGION...AFFECTING MAINLY THE
WESTERN AND NORTHERN DISPATCH ZONES. SATURDAY WILL SEE
IMPROVEMENT IN BOTH MIXING ABILITY AND DISPERSION...ESPECIALLY
EAST OF THE DIVIDE AND ACROSS THE SOUTHERN ZONES.

&&

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

$$

SHORT TERM...LAVOIE
LONG TERM...BRANHAM
AVIATION...LAVOIE
FIRE WEATHER...LAVOIE





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