693 
FXUS65 KPSR 220922
AFDPSR

SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PHOENIX AZ
225 AM MST FRI OCT 22 1999

.SYNOPSIS...
A STRONG RIDGE OF HIGH PRESSURE WILL CONTINUE TO GIVE US MOSTLY CLEAR
SKIES AND VERY WARM TEMPERATURES THROUGH THE WEEKEND. THERE WILL BE A
FEW HIGH CLOUDS FROM TIME TO TIME ESPECIALLY ACROSS THE WESTERN PARTS
OF THE STATE. A WEAK LOW PRESSURE SYSTEM OFF THE CALIFORNIA COAST IS
EXPECTED TO MOVE CLOSER TO ARIZONA BY EARLY NEXT WEEK FOR MODERATING
TEMPERATURES BUT NO SIGNIFICANT CLOUDINESS.

.DISCUSSION...
DEEP CLOSED LOW OVER LAKES AND FULL LATITUDE RIDGE FROM MEXICO TO
CANADA IS HANDLED NEARLY THE SAME BY ALL MDLS. WITH SLUGGISH MVMNT
HEIGHTS AND THICKNESSES DO NOT CHANGE MUCH AT ALL...ONLY A FEW THIN
STREAKS OF CIFM CLOUDS FROM TIME TO TIME. 250MB SPEED MAX TO OUR S
WILL LIKELY SAG FARTHER S WITH TIME...THO TRENDS NOT AS FAST AS PREV
RUNS SUGGESTED.

SFC PATTERN CONTINUES TO SHOW THERMAL LOW ACROSS CA AND MODERATE HIGH
OVER PLAINS STATES. GRADIENTS CONTINUE RATHER LIGHT...AND WITH NO MID
LEVEL SUPPORT MIXING WILL AGAIN BE HELD DOWN AND RESULTING MAXS EQUAL
TO OR JUST SHY OF THOSE YESTERDAY.  BY SUNDAY AND MONDAY HIGH CLDS TO
THICKEN A BIT MORE AS CLSD LOW NR 30/120 BECOMES BETTER ORGANIZED.
SIPPLE