000 
FXUS65 KPSR 132138
AFDPSR
AZZ020>028-CAZ030>033-140545-

SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PHOENIX AZ
235 PM MST THU JUN 13 2002

.SYNOPSIS...
STRONG HIGH PRESSURE ALOFT CENTERED OVER NORTHWEST MEXICO WILL 
CONTINUE EXPANDING OVER THE SOUTHWESTERN UNITED STATES WITH THE 
WARMING TREND CONTINUING THROUGH FRIDAY. CLEAR NIGHTS AND SUNNY DAYS 
ARE FORECAST FROM TONIGHT THROUGH THE MIDDLE OF NEXT WEEK. THE 
SOUTHERN END OF A WEAKENING PACIFIC LOW PRESSURE SYSTEM MAY CAUSE 
TEMPERATURES TO DROP BACK SLIGHTLY EARLY NEXT WEEK.

.DISCUSSION...
STRONG HIGH PRESSURE CONTINUES OVER THE SW UNITED STATES...AND THE 
LATEST IR IMAGERY SHOWS CLEAR SKIES OVER THE DESERT SW INCLUDING AZ 
AND SRN CA. SFC DEWPOINTS OVER THE CWA ARE LOW...MOSTLY IN THE 20S 
AND 30S. TEMPS TODAY HAVE WARMED A HANDFUL OF DEGREES COMPARED TO 
WED...AS THE UPPER HIGH BUILDS AND HGTS/THICKNESSES RISE. HIGHEST 
DESERT MAX READINGS LIKELY TO BE AROUND 108 TODAY...AND SHOULD 
EXCEED 110 IN SPOTS FRI THRU SAT. UPPER HIGH IS CENTERED OVER FAR 
NWRN MEX AND THIS HAS AZ UNDER A DRY SWLY TO WLY WINDFLOW KEEPING 
SKIES CLEAR. EXPECT CLEAR SKIES THROUGH THE WEEKEND...AND THROUGH 
MOST OF NEXT WEEK AS WELL AS THE UPPER ATMOSPHERIC WINDFLOW WILL 
REMAIN WESTERLY. ALL SHORT AND MED RANGE MODELS ARE IN PRETTY GOOD 
AGREEMENT THAT THE BASIC WEATHER PATTERN WILL HOLD THROUGH AT LEAST 
THE MIDDLE OF NEXT WEEK...WITH HIGH PRESSURE DOMINATING THE SW FOR 
DRY CONDITIONS...AND THE HIGH CENTER REMAINING TO OUR SOUTH. AVN 
SUGGESTS A POSSIBILITY THAT A BIT OF MID LEVEL MOISTURE MAY ROTATE 
AROUND THE HIGH AND INTO SERN AZ IN A COUPLE OF DAYS...AND THIS MAY 
CAUSE SOME MOSTLY SUNNY SKIES OVER OUR ERN ZONES FRI NIGHT THRU 
SAT...BUT THIS IS IFFY AND MOST OF THIS MOISTURE WILL LIKELY STAY TO 
OUR S AND E. MAX WARMING SHOULD TAKE PLACE FRI AND SAT...THEN TEMPS 
SHOULD GRADUALLY TAPER OFF SUNDAY THROUGH THE MIDDLE OF NEXT WEEK AS 
THE HIGH SLOWLY WEAKENS WITH FALLING HGTS AS A PACIFIC TROF STARTS 
TO PUSH INLAND OVER THE PAC NW. WINDS SHOULD BE RATHER MODEST FOR 
THE NEXT FEW DAYS...AS GRADIENTS ARE NOT ALL THAT STRONG UNDER THE 
HIGH. HOWEVER WITH THE AMPLE SUNSHINE AND THERMAL MIXING...EVEN THE 
MODEST SWLY TO WLY MID LEVEL WINDS SHOULD HAVE NO TROUBLE REACHING 
THE GROUND IN THE AFTERNOON. THUS EXPECT SW TO W WINDS FROM 10 TO 20 
MPH COMMON OVER THE DESERTS EACH DAY...AND THEY WILL LIKELY BE IN 
THE BREEZY CATEGORY SATURDAY..WITH SPEEDS AROUND 25 MPH IN 
SPOTS...AS 700MB WLY FLOW INCREASES A BIT.  11

.PSR...NONE.