Area Forecast Discussion
Issued by NWS Riverton, WY

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FXUS65 KRIW 170522
AFDRIW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
1121 PM MDT WED APR 16 2014

.SHORT TERM...TONIGHT THROUGH THURSDAY

NICE CONVECTIVE ACTIVITY THIS AFTERNOON ALONG THE EASTERN SLOPES
OF THE BIGHORN MOUNTAINS SOUTH INTO NATRONA COUNTY. THE SHOWERS
HAVE BEEN REDUCING VISIBILITIES DOWN TO 1SM AT KCPR AND POSSIBLY
ON AREA ROADWAYS. SIMILAR CONDITIONS EVIDENT ALONG EAST SLOPES OF
ABSAROKAS - WEST PART OF THE BIG HORN BASIN. CERTAINLY COOLER AND
MOISTER EAST OF THE DIVIDE...WITH BREEZY DRIER CONDITIONS ACROSS
SOUTHWEST WYOMING. EXPECTING THE WEAK CONVECTIVE ACTIVITY TO
CONTINUE INTO THE EARLY EVENING HOURS BEFORE DISSIPATING. MOST LIKELY
AREAS FOR THE SHOWERS ARE ACROSS THE NORTHERN BIG HORN
BASIN...OVER TO JOHNSON COUNTY. OVERALL CLOUDINESS IS ALSO EXPECTED
TO CONTINUE OVERNIGHT WITH SLIGHTLY DESTABILIZED MID LAYERS.

VERY SHORTWAVE RIDGE LOOKS TO MOVE OVER THE FORECAST AREA ON
THURSDAY. WITH 700MB TEMPS WARMING BACK UP TO -2C TO 2C...AFTERNOON
TEMPERATURES WILL BE ABOUT 10 DEGREES WARMER THAN WEDNESDAY.
ANOTHER SHORTWAVE TROUGH MOVES INTO THE PACIFIC NORTHWEST ON
THURSDAY.  AS LEE SIDE TROUGH BEGINS TO BUILD IN MONTANA AND NE
WY...SOUTHWEST WIND WILL INCREASE DURING THE AFTERNOON AND EVENING
FROM SW TO CENTRAL WYOMING.

.LONG TERM...THURSDAY NIGHT THROUGH WEDNESDAY

PROGRESSIVE ATMOSPHERIC PATTERN DURING THIS EXTENDED PERIOD. NO
MAJOR WEATHER SYSTEMS EXPECTED THROUGH TUESDAY WITH AT OR ABOVE
NORMAL TEMPERATURES FOR WEST CENTRAL WYOMING. FRIDAY NIGHT AND
SATURDAY WILL HAVE NEAR NORMAL TEMPERATURES BEHIND A COLD FRONT.

ABOVE NORMAL TEMPERATURES THEN LOOK VERY LIKELY MONDAY AND TUESDAY
AHEAD OF AN INCOMING WEST COAST TROUGH. COULD HAVE SOME DECENT
SNOWMELT IN THE WYOMING HIGH COUNTRY THESE TWO DAYS WITH WARMING AT
BOTH THE SURFACE AND ALOFT. PATTERN ALSO SUPPORTS BREEZY CONDITIONS.

AFOREMENTIONED TROUGH THEN APPROACHES ROCKIES BY WEDNESDAY OF NEXT
WEEK. TOO EARLY TO TELL HOW THIS SYSTEM WILL BEHAVE...BUT COULD BE
MIXED BAG OF WEATHER ACROSS WEST CENTRAL WYOMING DURING THE DAY.
WILL MONITOR NEXT FEW MODEL RUNS...ESPECIALLY WITH RESPECT TO TIMING.

&&

.AVIATION.../06Z ISSUANCE/

FOR THE REST OF THE NIGHT...A FEW SNOW SHOWERS WILL IMPACT THE
NORTHERN BIGHORN RANGE...AND POSSIBLY ADJACENT LOWER ELEVATIONS OF
JOHNSON COUNTY. ALSO SOME STRATUS WITH A WEAK MOIST EASTERLY FLOW
COULD IMPACT KCPR UNTIL ABOUT 10Z WHEN BOUNDARY LAYER BEGINS TO DRY
OUT.

VFR AND DRY CONDITIONS WITH RELATIVELY LIGHT WINDS WILL OCCUR
THURSDAY AS A QUICK MOVING UPPER RIDGE BUILDS ACROSS THE COWBOY
STATE. CONSIDERABLE HIGH LEVEL CLOUDINESS IS EXPECTED TO DEVELOP
ESPECIALLY ALONG AND EAST OF THE DIVIDE THURSDAY AFTERNOON WITH SOME
MID LEVEL CLOUDS OVER THE NORTH. THE NEXT STORM SYSTEM WILL APPROACH
THE AREA LATE THURSDAY NIGHT RESULTING IN INCREASING CLOUDINESS OVER
THE WEST...AS WELL AS INCREASING MOUNTAIN WINDS WITH POSSIBILITY OF
SOME LOW LEVEL WIND SHEAR DEVELOPING AT KCOD AND KLND.

&&

.FIRE WEATHER...

RELATIVELY COOL AND MOIST CONDITIONS EAST OF THE DIVIDE LATE THIS
AFTERNOON AND EVENING DUE TO BACKSIDE OF DEPARTING LOW PRESSURE
SYSTEM. ISOLATED SHOW AND RAIN SHOWERS...ESPECIALLY IN JOHNSON AND
NATRONA COUNTIES AS WELL AS AROUND THE BIGHORN MOUNTAINS AND EAST
SLOPES OF THE ABSAROKAS...WILL DECREASE IN THE EVENING HOURS.  SW
WY WILL BE SOMEWHAT WARMER AND DRIER THIS EVENING WITH HUMIDITY
VALUES REBOUNDING FROM THE UPPER TEENS.

THURSDAY WILL SEE HIGH PRESSURE MOVING OVER THE REGION. RESULT IS
AFTERNOON TEMPERATURES 10-12 DEGREES WARMER THAN WEDNESDAY. MIN RH
VALUES WILL DROP AS WELL INTO THE 20S AND LOW 30S...ESPECIALLY IN
NORTHERN AND CENTRAL WYOMING. WIND WILL BE RELATIVELY LIGHT
OVERNIGHT AND INTO THURSDAY MORNING BEFORE PICKING UP FROM THE
SOUTHWEST THURSDAY AFTERNOON...ESPECIALLY ACROSS SOUTHERN AND
CENTRAL WYOMING.

FRIDAY WILL SEE INCREASED CLOUDINESS FROM THE WEST AS SHOWERS ARE
EXPECTED ACROSS NORTHWEST WYOMING BY MID DAY. EVEN MORE WARMING
EAST OF THE DIVIDE AND IN SOUTHERN WYOMING AHEAD OF A WEAK FRONT
THAT WILL SAG ACROSS SW TO NE WY BY FRIDAY EVENING.

&&

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

&&

$$

SHORT TERM...MCDONALD
LONG TERM...KPL
AVIATION...WM
FIRE WEATHER...MCDONALD













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