080 
FXUS65 KPSR 310409
AFDPSR
AZZ020>028-CAZ030>033-311045-

SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION 
NATIONAL WEATHER SERVICE PHOENIX AZ
910 PM MST WED OCT 30 2002

.SYNOPSIS...
HIGH PRESSURE ALOFT WILL CONTINUE TO RESULT IN CLEAR SKIES TONIGHT...
AND MOSTLY SUNNY SKIES THURSDAY. AFTER THAT...THE SUBTROPICAL 
JETSTREAM AND A PACIFIC LOW PRESSURE SYSTEM WILL BRING PERIODS OF 
MID AND HIGH LEVEL CLOUDINESS FROM THE SOUTHWEST TO THE SOUTHWESTERN 
UNITED STATES THROUGH EARLY NEXT WEEK. AVERAGE TEMPERATURES FOR THIS 
TIME OF YEAR ARE FORECAST THROUGH THE WEEKEND...THEN SOME COOLING IS 
EXPECTED MONDAY.

.DISCUSSION...
A CLOSED LOW IS FORECAST TO REMAIN QUASI-STATIONARY OVER IDAHO INTO 
THE WEEKEND...UNDER A REX BLOCK PATTERN.  AS A RESULT...A MODERATELY 
STRONG BUT DRY WESTERLY FLOW WILL CONTINUE OVER ARIZONA THE NEXT 5 
OR MORE DAYS. THE FLAGSTAFF SOUNDING SHOWED MOISTURE CAUGHT UNDER A 
SHALLOW INVERSION FOR SOME NOCTURNAL LOW CLOUDINESS IN THE HIGH 
COUNDRY. OTHERWISE PERIODS OF HIGH CLOUDS ARE EXPECTED TO RACE 
ACROSS THE STATE...FROM THE PACIFIC...THE NEXT SEVERAL DAYS. CURRENT 
DRY FORECASTS LOOK OK. NO UPDATES NECESSARY. VASQUEZ
 
.PSR...NONE.