FXUS66 KSGX 232118
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
200 PM PST WED DEC 23 2009

.SYNOPSIS...
FAIR WEATHER IS EXPECTED THROUGH FRIDAY AS HIGH PRESSURE ALOFT 
CONTINUES ALONG THE WEST COAST. SURFACE HIGH PRESSURE OVER THE GREAT 
BASIN WILL BRING LOCAL OFFSHORE WINDS AT TIMES THE NEXT FEW DAYS. 
FOR SUNDAY THROUGH EARLY NEXT WEEK...LOW PRESSURE FROM THE PACIFIC 
WILL BRING COOLER WEATHER AND A CHANCE OF PRECIPITATION.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

THESE CLEAR SKIES AND SPARKLING VISIBILITIES WILL STAY WITH US FOR A 
FEW MORE DAYS...ALONG WITH LOCAL BREEZY OFFSHORE WINDS AND AREAS OF 
VALLEY FROST DURING THE MORNINGS. TEMPERATURES WILL WARM UP BUT NOT 
A WHOLE LOT THROUGH CHRISTMAS AS HIGH PRESSURE ALOFT PEAKS ALONG THE 
WEST COAST. A TROUGH OF LOW PRESSURE NUDGES INTO THE WEST COAST 
SATURDAY AND SUNDAY AND THAT WILL BRING MORE CLOUDS AND A CHANCE OF 
RAIN INTO THE PICTURE SUNDAY AND MONDAY. THIS LOW PRESSURE SYSTEM 
DEVELOPS IN THE PACIFIC AND COULD HEAD INTO SOUTHERN CALIFORNIA 
SUNDAY...BUT THE MODELS HAVE STILL NOT COMMITTED THEMSELVES TO ANY 
PARTICULAR SOLUTION EXACTLY ABOUT WHERE...WHEN...OR HOW STRONG IT 
WILL BE. SINCE IT SEEMS THIS LOW WILL BE FLOATING AROUND SOMEWHERE 
IN OUR VICINITY...WE HAVE A CHANCE OF PRECIPITATION TO REFLECT THAT 
IDEA SUNDAY AND MONDAY. MORE UNCERTAINTY ABOUNDS LATER NEXT WEEK 
WITH HINTS OF RAIN. 

&&

.AVIATION...
232000Z...A MOSTLY CLEAR SKY WITH UNRESTRICTED VISIBILITIES WILL 
CONTINUE THROUGH THURSDAY.

LOCAL GUSTY NORTHEAST WINDS WITH ASSOCIATED UP AND DOWN DRAFTS AND 
LOW LEVEL WIND SHEAR ACROSS THE MOUNTAINS AND THROUGH AND BELOW 
PASSES AND CANYONS WILL CONTINUE THROUGH THURSDAY MORNING. HORTON

&&

.SGX WATCHES/WARNINGS/ADVISORIES...

FROST ADVISORY FOR THE VALLEYS TONIGHT AND THURSDAY MORNING...SEE 
LAXNPWSGX.

&&

$$

PUBLIC...MM
AVIATION...HORTON