FXUS65 KCYS 111018 AAB
AFDCYS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
318 AM MST FRI DEC 11 2009

.SHORT TERM...TODAY THROUGH SATURDAY NIGHT...
GENERALLY QUIET WEATHER EXPECTED OVER THE CWA TODAY THROUGH SATURDAY 
AS UPPER FLOW GRADUALLY BACKS FROM NW TO WEST AND THICKNESSES RISE 
AS COLDER AIR RETREATS NORTHWARD.  RATHER FAST WESTERLY FLOW WILL 
ALLOW FOR SOME GUSTY WINDS IN THE WIND FAVORED AREAS OVER THE NEXT 
COUPLE DAYS BUT SHOULD STAY BELOW HIGH WIND LEVELS OVERALL.  SOME 
MOISTURE SHOULD ADVECT OVER THE AREA FROM AN UPPER LOW THAT WILL 
MOVE ONTO THE CAL COAST SAT NIGHT AND SHOULD SET OFF SOME 
OROGRAPHICALLY INDUCED SNOW SHOWERS OVER THE HIGHER MTNS SATURDAY 
AND SATURDAY NIGHT WITH MAINLY DRY WEATHER ELSEWHERE.

.LONG TERM...SUNDAY THROUGH THURSDAY...

SUNDAY...NEXT SHORTWAVE TROUGH MOVES ACROSS WYOMING WITH A STRONG 
SOUTH MOVING COLD FRONT POISED TO ENTER OUR NORTHERN COUNTIES IN THE 
AFTERNOON. SCATTERED SNOW SHOWERS ACROSS OUR WESTERN AND NORTHERN 
COUNTIES ON MOIST WEST FLOW ALOFT.

MONDAY...SIGNIFICANT COOLING IN THE WAKE OF THE ARCTIC COLD FRONT 
THAT WILL LIE ACROSS OUR SOUTHERN COUNTIES IN THE AFTERNOON. 
ISOLATED TO SCATTERED SNOW SHOWERS IN THE COLD AIR BEHIND THE COLD 
FRONT AND WHERE OROGRAPHIC EFFECTS WILL BE MOST PREVALENT.

TUESDAY...WARMING TREND AS LOW AMPLITUDE RIDGING ALOFT DEVELOPS 
ACROSS THE GREAT BASIN STATES. DRY WITH DECREASE IN LOW AND MID 
LEVEL MOISTURE.

WEDNESDAY...RIDGE ALOFT AND RELATIVELY HIGH HEIGHTS AND THICKNESSES 
WILL HELP THE MILD TEMPERATURES. HIGH TEMPERATURES IN THE LOWER 30S 
TO LOWER 40S WITH 1000-500 MB THICKNESSES NEAR 5550 METERS.

THURSDAY...CONTINUED RELATIVELY MILD WITH HIGH TEMPERATURES 30S WEST 
TO 40S EAST WITH 1000-500 MB THICKNESSES NEAR 5520 METERS AND DRY 
NORTHWEST FLOW ALOFT. 

&&

.AVIATION...VFR TODAY. VFR TONIGHT AND SATURDAY...WITH LOCALIZED 
MVFR IN SNOW SHOWERS AND LOW CLOUDS ACROSS THE SNOWY RANGE. 

&&

.FIRE WEATHER...NO CONCERNS ANTICIPATED THROUGH SATURDAY.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...NONE.
NE...NONE.

&&

$$

SHORT TERM/FIRE WEATHER...RE
LONG TERM/AVIATION...RUBIN