684 
FXUS65 KRIW 252135
AFDRIW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
335 PM MDT TUE JUN 25 2013

.SHORT TERM...TODAY THROUGH WEDNESDAY

LIMITED MOISTURE AND INSTABILITY IN WEST FLOW WILL PRODUCE 
SCATTERED MOUNTAIN SHOWERS AND ISOLATED EVENING THUNDERSTORMS
ACROSS THE WEST TONIGHT AND AGAIN ON WEDNESDAY. BREEZY TO WINDY
CONDITIONS TONIGHT AND WEDNESDAY WITH WARMING TEMPERATURES WILL
EXIST.

.LONG TERM...WEDNESDAY NIGHT THROUGH TUESDAY

BUILDING RIDGE TO REMAIN THE DOMINANT WEATHER FEATURE THROUGH THE 
VAST MAJORITY OF THE PERIOD. MODELS CONTINUE TO TREND THE RIDGE 
SLIGHTLY FURTHER WEST...KEEPING TEMPERATURES ACROSS CENTRAL WYOMING 
SLIGHTLY COOLER. 

A SLIGHT OPPORTUNITY FOR SHOWER ACTIVITY MAY BE FOUND ACROSS EXTREME 
SOUTHWESTERN SWEETWATER COUNTY AS A DISTURBANCES PUSHES INTO THE 
RIDGE THURSDAY AFTERNOON. THIS POTENTIAL FOR SHOWER DEVELOPMENT WILL 
BE VERY SHORT LIVED...WITH A RETURN TO DRY CONDITIONS BY THURSDAY 
EVENING. BEYOND THURSDAY...PERIODS OF AFTERNOON SHOWERS AND 
THUNDERSTORMS MAY BE POSSIBLE THROUGH SATURDAY UNDER THE CONTINUED 
INFLUENCE OF THE RIDGE OF HIGH PRESSURE. 

THE RIDGE OF HIGH PRESSURE IS EXPECTED TO AMPLIFY BY SATURDAY...WITH 
INCREASED FLOW ACROSS THE AREA. ADDITIONALLY...AN APPROACHING SYSTEM 
WILL SEND SOME MOISTURE WITHIN THE RIDGE TO CREATE ADDITIONAL SHOWER 
COVERAGE. THIS MOISTURE WILL STAY TRAPPED UNDER THE AMPLIFIED RIDGE 
TO KEEP SOME SHOWER ACTIVITY ACROSS THE MOUNTAINS THROUGH THE 
WEEKEND.

THE AMPLIFICATION OF THE RIDGE WILL ALLOW A BACK DOOR COLD FRONT TO 
SWEEP THROUGH EASTERN WYOMING...HELPING TO COOL OFF TEMPERATURES 
SOMEWHAT DURING THE EARLY PORTION OF NEXT WEEK. THE RIDGE WILL 
CONTINUE TO AMPLIFY AND RETROGRADE WEST THROUGH WEDNESDAY.

.AVIATION.../00Z ISSUANCE/

WEST FLOW ALOFT WILL BRING LIMITED PACIFIC MOISTURE TO WESTERN AND
NORTHERN WYOMING THROUGH 00Z THURSDAY. SCATTERED LIGHT RAIN
SHOWERS WITH ISOLATED AFTERNOON AND EARLY EVENING THUNDERSTORMS
WITH GUSTY WINDS WILL BE ENCOUNTERED OVER THE WESTERN AND NORTHERN
MOUNTAINS. ISOLATED SHOWERS AND THUNDERSTORMS MAY BE ENCOUNTERED
VICINITY KJAC THROUGH 02Z WEDNESDAY. THE REST OF THE AREA WILL BE
DRY. WEST TO SOUTHWEST WINDS OF 15KTS TO 25 KTS WILL BLOW OVER AND
NEAR THE MOUNTAINS...ESPECIALLY ALONG AND NEAR THE EAST SLOPES OF
THE MOUNTAINS AND THROUGH THE WIND CORRIDOR FROM KRKS TO KCPR. VFR
CONDITIONS ARE EXPECTED AT THE AIRPORTS THROUGH 18Z WEDNESDAY.

.FIRE WEATHER...

RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING
FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 280...
285 AND 300.  LIMITED MOISTURE AND INSTABILITY IN WEST FLOW WILL 
PRODUCE SCATTERED MOUNTAIN SHOWERS AND ISOLATED EVENING
THUNDERSTORMS ACROSS THE WEST TONIGHT AND AGAIN ON WEDNESDAY.
BREEZY TO WINDY CONDITIONS TONIGHT AND WEDNESDAY WITH WARMING
TEMPERATURES WILL EXIST. RELATIVE HUMIDITY WILL REMAIN LOW.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
RED FLAG WARNING UNTIL 9 PM MDT THIS EVENING WYZ280-285-300.

&&

$$

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