000
FXUS66 KSGX 070542
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
940 PM PST TUE JAN 6 2009
.SYNOPSIS...WEDNESDAY WILL BE CLEAR AND WARM UNDER HIGH PRESSURE
ALOFT. A WEAK TROUGH WILL BRING SLIGHT COOLING AND A SHALLOW MARINE
LAYER THURSDAY INTO FRIDAY MORNING. OFFSHORE FLOW WILL BRING CLEAR
SKIES OVER THE WEEKEND ALONG WITH GUSTY SANTA ANA WINDS AT TIMES.
DRY...WARM WEATHER WILL PREVAIL NEXT WEEK.
&&
.DISCUSSION...FOR SOUTHWEST CALIFORNIA INCLUDING SAN DIEGO...
ORANGE...SOUTHWEST SAN BERNARDINO AND WEST RIVERSIDE COUNTIES.
TEMPERATURES TODAY WERE SEVERAL DEGREES HIGHER THAN YESTERDAY IN
ALMOST ALL AREAS. THE EXCEPTION WAS THE IMMEDIATE COAST WHERE COLD
OCEAN WATER TEMPS IN THE MID 50S HELD DOWN TEMPERATURES. CLEAR AND
COLD TONIGHT WITH LOW TEMPS NEAR FREEZING IN WIND SHELTERED AREAS.
WEDNESDAY WE WILL ADD SEVERAL MORE DEGREES OF WARMING WITH HIGH
PRESSURE BUILDING OVERHEAD. THURSDAY SHOULD BE NEARLY AS WARM...BUT
THE ADVANCE OF AN UPPER LEVEL SHORT WAVE WILL INCREASE THE ONSHORE
GRADIENTS AND COOL COASTAL AND VALLEYS TEMPS A DEGREE OR TWO. MTN
AND DESERT TEMPS WON`T BE AFFECTED AND WILL BE JUST AS WARM AS
WEDNESDAY.
EVEN WITH THE RETURN OF ONSHORE FLOW THURSDAY...ANY MARINE LAYER
THAT DOES FORM WILL BE SHORT LIVED. IT WILL REACH ITS APEX FRIDAY
MORNING...THEN RAPIDLY TURNAROUND TO STRONG OFFSHORE FLOW FRIDAY
AFTERNOON.
SANTA ANA WINDS BARREL INTO SOUTHERN CAL IN EARNEST MIDDAY FRIDAY.
COLD NORTHEAST WINDS WILL BRING SIGNIFICANT COOLING TO THE MTNS AND
HIGH DESERTS FRIDAY AFTERNOON. WEST OF THE MTNS...THE COOL AIRMASS
WILL BE PARTIALLY OFFSET BY DOWNSLOPE WARMING FROM THE SANTA ANA
WINDS FILTERING THROUGH THE MTN PASSES...ESPECIALLY IN ORANGE
COUNTY. THE MARINE LAYER WILL BE PUSHED WELL OFFSHORE FRIDAY NIGHT.
THIS LOOKS LIKE IT WILL BE A MODERATELY STRONG SANTA ANA WITH GUSTY
WINDS FRIDAY AND SATURDAY. WIND ADVISORIES APPEAR LIKELY...POSSIBLY
WARNINGS.
NEXT WEEK...THE LARGE SCALE HIGH AMPLITUDE UPPER AIR PATTERN
FORECASTS A LARGE RIDGE OVER THE WEST COAST AND A DEEP TROUGH OVER
THE EASTERN HALF OF THE NATION. THAT MEANS OFFSHORE FLOW FOR
SOCAL...ABOVE AVERAGE TEMPERATURES FOR MID JANUARY...AND NO RAIN OR
SNOW.
&&
.AVIATION...070300Z
VFR OVER THE AREA THROUGH WED...EXCEPT SOME 3-5SM VIS RESTRICTION IN
HAZE IS POSSIBLE BETWEEN 08Z AND 16Z WED WEST OF THE MOUNTAINS IN A
SHALLOW MARINE LAYER. PRESSURE GRADIENTS AND SEA BREEZE WILL BE
WEAK...SO SFC WINDS WILL BE MOSTLY UNDER 10 KT.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...NONE.
&&
$$
PUBLIC...MOEDE
AVIATION...JAD
