000
FXUS65 KCYS 272025
AFDCYS
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
200 PM MDT WED AUG 27 2008
.SHORT TERM...TONIGHT THROUGH FRIDAY
NW FLOW WILL CONTINUE ALOFT OVER THE CWA THROUGH THURSDAY NIGHT. A
BROAD UPPER TROUGH WILL MOVE INTO THE NORTHERN PLAINS TONIGHT AND
WILL BEGIN TO MOVE INTO THE UPPER MIDWEST ON THURSDAY. THE FLOW
ALOFT WILL BECOME WESTERLY ON FRIDAY AS AN UPPER RIDGE BEGINS TO
BUILD OVER THE ROCKIES. COOLER AIR WILL BE ADVECTED INTO THE
FORECAST AREA TONIGHT AS SURFACE WIND BECOME NW TO N IN RESPONSE TO
SURFACE LOW PRESSURE MOVING OVER THE CENTRAL PLAINS. SOUTHERLY
SURFACE WINDS WILL DEVELOP THUR NIGHT AND FRIDAY. STABLE AIRMASS
WILL SETTLE IN OVER THE AREA WITH LOW AIRMASS MOISTURE THROUGH
FRIDAY. THIS WILL RESULT IN DRY CONDITIONS ACROSS THE AREA IN THE
SHORT TERM. HIGH TEMPERATURES WILL BE AROUND NORMAL THURSDAY...AND
4 TO 6 DEGREES ABOVE NORMAL FOR FRIDAY.
.LONG TERM...FRIDAY NIGHT THROUGH WEDNESDAY...DRY AND QUITE WARM
WEATHER EXPECTED SATURDAY AS RATHER FLAT UPPER RIDGE MOVES ACROSS
THE REGION. CHANGES BEGIN TO OCCUR SAT NIGHT AND SUNDAY AS SFC TROF
DEEPENS OVER THE HIGH PLAINS IN RESPONSE TO DIGGING UPPER TROF OVER
THE WESTERN CONUS. MOISTURE WILL INCREASE OVER THE CWA INTO EARLY
NEXT WEEK WITH BACKING UPPER FLOW AND APPROACH OF UPPER TROF.
SYSTEM SHOULD PUSH ACROSS THE NORTHERN AND CENTRAL ROCKIES MONDAY
INTO TUESDAY WITH SFC COLD FRONT PUSHING ACROSS THE CWA LATE
MONDAY. SYSTEM WILL BRING SCATTERED SHOWERS AND TSTRMS TO MOST
AREAS PRIMARILY LATE SUNDAY THROUGH MONDAY BEFORE CLEARING OUT
TUESDAY AS UPPER TROF LIFTS OVER THE NORTHERN PLAINS. DRY AND A
LITTLE WARMER WEATHER EXPECTED FOR WEDNESDAY AS SFC HIGH SETTLES
ACROSS THE CENTRAL PLAINS WITH RETURN FLOW ON BACKSIDE OF HIGH OVER
THE CWA.
&&
.AVIATION...
VFR CONDITIONS WILL CONTINUE ACROSS THE AREA FROM TONIGHT THROUGH
FRIDAY.
&&
.FIRE WEATHER...
WILL KEEP RED FLAG WARNING IN EFFECT INTO THIS EVENING AND LET
EVENING SHIFT CANCEL OR LET IT EXPIRE. WARNING IS WORKING OUT WELL
AT THE MOMENT...WITH RWL...DGW...AND ARL ALL GUSTING TO 35 TO 45 MPH
WITH RHS LESS THAN 15 PERCENT.
&&
.CYS WATCHES/WARNINGS/ADVISORIES...
WY...RED FLAG WARNING UNTIL 9 PM THIS EVENING FOR FIRE WX
ZONES 291..293..294.
NE...NONE.
&&
$$
