FXUS66 KSGX 142154
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
155 PM PST MON DEC 14 2009

.SYNOPSIS...BUILDING HIGH PRESSURE AND WEAK OFFSHORE FLOW WILL BRING 
DRY...WARMER WEATHER THIS WEEK. 

&&

.DISCUSSION...FOR SOUTHWEST CALIFORNIA INCLUDING SAN DIEGO... 
ORANGE...SOUTHWEST SAN BERNARDINO AND WEST RIVERSIDE COUNTIES.

THE MARINE LAYER WAS DEEP ENOUGH FOR STRATOCU TO FORM THIS 
AFTERNOON. THESE CLOUDS WILL DISSIPATE AFTER SUNSET LEAVING BEHIND 
CLEAR SKIES AND LIGHT WINDS...PRIME CONDITIONS FOR RAPID RADIATIONAL 
COOLING. THE AIRMASS IS STILL QUITE COOL AND OVERNIGHT LOWS WILL 
FALL INTO THE 30S IN THE VALLEYS. THERE MAY BE FROST IN THE COLDEST 
VALLEYS. AND SINCE THE GROUND IS SATURATED FROM RECENT RAINS THERE 
WILL ALSO BE AREAS OF FOG LATER TONIGHT THROUGH EARLY TUESDAY. 

THE IR LOOP SHOWS A RATHER IMPRESSIVE COMMA CLOUD RACING TOWARD THE 
PACIFIC NORTHWEST THIS AFTERNOON. HIGH PRESSURE BUILDING OVER THE 
SOUTHWEST WILL KEEP THE STORM TRACK WELL TO THE NORTH. WE WILL BE ON 
THE SOUTHERN PERIPHERY OF THESE STORMS SYSTEMS AND WILL SEE ONLY 
OCCASIONAL HIGH CLOUDS AT TIMES. THAT'S ABOUT IT. 

THE UPPER RIDGE STRENGTHENS OVER THE SOUTHWEST THURSDAY AND FRIDAY. 
THE SURFACE HIGH OVER UTAH WILL BE A LITTLE STRONGER DURING THAT 
TIME...INCREASING THE OFFSHORE GRADIENTS FOR BETTER CHANCES OF 
BREEZY CONDITIONS THROUGH THE MTN PASSES AT TIMES. THE WEAK OFFSHORE 
FLOW AND DOWN SLOPE WARMING WEST OF THE MOUNTAINS WILL PUSH 
TEMPERATURES INTO THE 70S THU AND FRI.   

AFTER TONIGHT...THE MARINE LAYER WILL REMAIN SHALLOW THROUGHOUT THE 
WEEK. ANY LOW CLOUDS THAT DO FORM WILL BE LIMITED TO THE IMMEDIATE 
COAST. 

RAIN CHANCES THIS WEEK ARE SLIM TO NONE. OUR NEXT CHANCE FOR RAIN 
WILL BE NEXT WEEK AT THE EARLIEST.

&&

.AVIATION...
142000Z...A WEAK MARINE LAYER APPEARS TO BE DEVELOPING BETWEEN 2500 
AND 3000 FEET OVER THE AREA THIS AFTERNOON. EXPECT SOME LOWERING TO 
AROUND 2000 FEET OVERNIGHT. SCATTERED STRATOCU WITH BASES BETWEEN 
2500 AND 3000 FEET SHOULD BECOME MOSTLY CLEAR THIS EVENING. A CLEAR 
SKY TONIGHT WILL ALLOW FOR SOME DENSE FOG WITH VLIFR CONDITIONS TO 
DEVELOP IN THE VALLEYS WHICH MAY INCLUDE KONT AND VICINITY BEFORE 
SUNRISE ON TUESDAY. FOG SHOULD DISSIPATE WITHIN AN HOUR OR TWO AFTER 
SUNRISE. HORTON

&&

.SGX WATCHES/WARNINGS/ADVISORIES...NONE.

&&

$$

PUBLIC...MOEDE
AVIATION...HORTON