000 
FXUS65 KCYS 172227 CCA
AFDCYS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
200 PM MST THU JAN 17 2002

AVN AND ETA VERY CLOSE IN THEIR SOLUTIONS ACROSS THE INTER-MOUNTAIN
WEST OVER THE NEXT 60 HOURS.  A WEAK SHORT WAVE WILL PASS ACROSS THE
CWA OVERNIGHT...WITH MAIN UPPER TROUGH AXIS MOVING EAST OF THE CWA BY
06Z SAT.  BRIEF NORTHWEST FLOW ALOFT BEHIND SHORT WAVE...BUT THEN
ZONAL FLOW DEVELOPS SATURDAY NIGHT...AS ANOTHER UPPER TROUGH
MOVES INTO THE GREAT BASIN AREA.  SURFACE GRADIENT TIGHTENS SATURDAY
ACROSS THE FORECAST AREA...WITH SURFACE LEE TROUGH DEVELOPING DURING
THIS TIME.  THIS WILL RESULT IN WINDY CONDITIONS AND AFTER A
CONTINUATION OF COLD TEMPERATURES TONIGHT...THROUGH FRIDAY NIGHT...
SATURDAY WILL BE A BIT WARMER.  LOW LEVEL MOISTURE IS LIMITED
THROUGHOUT THE NEXT 60 HOURS...BUT SOME MID LEVEL MOISTURE WILL BE
PRESENT OVER THE AREA AT TIMES.  WILL CONTINUE LOW POPS FOR TONIGHT
THROUGH FRIDAY NIGHT...THEN DRY INTO THE EXTENDED PERIOD.

.EXTENDED...
OVERALL A COOL PATTERN TO PERSIST AS BROAD CYCLONIC FLOW XPCTD
OVER THE CONUS NEXT WEEK WITH LARGE POLAR VORTEX ANCHORED VCNTY
HUDSON BAY. WK RIDGING AND DOWNSLOPE FLOW SHOULD MODERATE TEMPS
MON AND TUES BEFORE NEXT SHORTWV DRIVES ANOTHER SURGE OF COLDER
AIR ACRS THE RGN WEDS INTO THURS.  MOISTURE REMAINS LACKING BUT
SOME LIGHT SNOW/FLURRIES POSS LATE WEDS/EARLY THURS AS SFC HIGH
NOSES INTO WY SETTING UP A BRIEF UPSLOPE PATTERN.

.CYS...
WY...NONE.
NE...NONE.

DAUGHERTY/RE