Area Forecast Discussion
Issued by NWS Riverton, WY

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000
FXUS65 KRIW 142028
AFDRIW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
228 PM MDT SUN SEP 14 2014

.SHORT TERM...TONIGHT THROUGH MONDAY

A WEAK COLD FRONT WILL MOVE SOUTH THROUGH THE AREA TONIGHT. WEST
NORTHWEST FLOW ALOFT WILL REMAIN OVER THE AREA THROUGH MONDAY.
SOME MID AND HIGH LEVEL MOISTURE FROM THE GREAT BASIN WILL MOVE
ACROSS THE SOUTHWEST WITH SCATTERED CLOUDS.  CONDITIONS WILL REMAIN
DRY WITH THE WARMING TREND CONTINUING.

.LONG TERM...MONDAY NIGHT THROUGH SUNDAY

AT MANY ISSUES THROUGH WEDNESDAY MORNING AS A RIDGE OF HIGH PRESSURE
WILL CONTINUE TO CONTROL THE WEATHER AND BRING LARGELY WARM AND DRY
CONDITIONS ALONG WITH FAIRLY LIGHT WINDS. TEMPERATURES SHOULD CLIMB
INTO THE 80S FOR THE BASIN LOCATIONS EAST OF THE DIVIDE FOR TUESDAY
AFTERNOON.

THE PATTERN WILL BEGIN TO CHANGE A BIT FOR WEDNESDAY AFTERNOON AS
THE TROUGH AXIS BEGINS TO SHIFT A BIT FURTHER TO THE EAST AND A
SHORTWAVE APPROACHES FROM THE WEST. WITH A BIT MORE MOISTURE
ARRIVING THERE COULD BE A FEW SHOWERS AND THUNDERSTORMS POPPING UP
ACROSS AREAS WEST OF THE DIVIDE. HOWEVER...THERE SHOULD BE FAIRLY
SPARSE AND MAINLY CONFINED TO THE HIGHER ELEVATIONS.
MEANWHILE...EXPECT THE DRY AND WARM WEATHER TO CONTINUE EAST OF THE
DIVIDE.

A COMBINATION OF THE RIDGE SHIFTING FURTHER EAST AND FLATTENING AND
INCREASING MOISTURE MOVING NORTHWARD FROM HURRICANE ODILE MAY
INCREASE COVERAGE OF SHOWERS AND THUNDERSTORMS. THE MODELS HAVE
BACKED OFF ON SPREADING THE MOISTURE FURTHER EASTWARD BUT MOISTURE
FROM TROPICAL SYSTEMS CAN BE REALLY FICKLE SO WE MADE FEW CHANGES
FOR THURSDAY. WITH A FRONT AND TROUGH MOVING ACROSS THE AREA IT
STILL LOOKS LIKE FRIDAY SHOULD HAVE THE BEST COVERAGE OF POSSIBLE
CONVECTION. CONTINUITY LOOKED REASONABLE SO AGAIN WE MADE FEW
CHANGES AT THIS POINT. WITH MORE CLOUD COVER...EXPECT A COOLING
TREND FOR FRIDAY AS WELL. AS FOR NEXT WEEKEND...THERE CONTINUES TO
BE A LOT OF DISAGREEMENT IN THE MODELS SO FOR NOW ONCE AGAIN...FEW
CHANGES WERE MADE.

&&

.AVIATION.../00Z ISSUANCE/

VFR CONDITIONS WILL PREVAIL THROUGH 00Z TUESDAY. A GUSTY WEST WIND
WILL OCCUR AGAIN IN SOUTHERN AND SOUTHWEST WYOMING UNTIL 02Z
MONDAY. THIS WOULD INCLUDE KRKS...KBPI...AND KPNA TERMINAL SITES.
A COLD FRONT WILL PUSH SOUTH WITH NORTHEAST SURFACE WINDS
SPREADING THROUGH THE AREA THROUGH 12Z MONDAY.

&&

.FIRE WEATHER...

THIS AFTERNOON WEST WINDS OF 20 MPH WITH GUSTS TO 30 MPH WILL
COMBINE WITH RELATIVE HUMIDITY BELOW 15 PERCENT ACROSS SWEETWATER
COUNTY PRODUCING RED FLAG CONDITIONS IN FIRE WEATHER ZONES 277 AND
279...LASTING UNTIL 8 PM MDT.  OTHERWISE A BUILDING AREA OF HIGH
PRESSURE WILL REMAIN OVER THE AREA FOR THE NEXT FEW DAYS. A WEAK
COLD FRONT WILL MOVE SOUTH ACROSS THE AREA TONIGHT...WITH A WIND
SHIFT TO THE NORTHEAST BRINGING INCREASED RELATIVE HUMIDITY. THE HIGH
PRESSURE SYSTEM WILL KEEP WARMING TEMPERATURES AND DRY CONDITIONS
PRESENT WITH LITTLE WIND EXPECTED.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
RED FLAG WARNING UNTIL 8 PM MDT THIS EVENING WYZ277-279.

&&

$$

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








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