000
FXUS66 KSGX 190939
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
330 AM PDT FRI MAR 19 2010
.SYNOPSIS...OFFSHORE FLOW WILL CAUSE LOCAL STRONG GUSTY WINDS
THROUGH AND BELOW MOUNTAIN CANYONS AND PASSES TODAY. THE MARINE
LAYER WILL CAUSE AREAS OF COASTAL LOW CLOUDS AND FOG DURING THE
NIGHTS AND MORNINGS. OTHERWISE...FAIR AND WARMER THROUGH THE WEEKEND
UNDER HIGH PRESSURE. UPPER LEVEL LOW PRESSURE WILL BRING MORE CLOUDS
AND COOLING EARLY NEXT WEEK. FAIR AND WARMER AGAIN TOWARD MID WEEK.
&&
.DISCUSSION...FOR SOUTHWEST CALIFORNIA INCLUDING SAN DIEGO...
ORANGE...SOUTHWEST SAN BERNARDINO AND WEST RIVERSIDE COUNTIES.
.SHORT TERM (TODAY-SUNDAY)...THERE WERE AREAS OF LOW CLOUDS AND FOG
THIS MORNING IN SAN DIEGO COUNTY W OF THE MOUNTAINS AND PARTS OF
ORANGE COUNTY. CLEAR ELSEWHERE. EARLY MORNING AIRCRAFT SOUNDINGS
SHOWED INCREASING NW WINDS ALOFT. OFFSHORE GRADIENTS FROM THE N WITH
ABOUT -5 MB SAN-TPH AND ONSHORE TO THE E.
AN UPPER TROUGH WILL MOVE OFF TO THE SE EARLY THIS MORNING. SURFACE
HIGH PRESSURE WILL BUILD OVER THE INTERIOR IN THE WAKE OF THIS
TROUGH. THE COMBINATION OF OFFSHORE GRADIENTS...ALONG WITH SOME
THERMAL AND UPPER SUPPORT WILL BRIEFLY CAUSE LOCAL STRONG OFFSHORE
WINDS. THE STRONGEST WINDS WILL BE NEAR THE CAJON PASS AND IN THE
SANTA ANA MOUNTAINS WERE THEY SHOULD REACH ADVISORY STRENGTH WITH
GUSTS TO NEAR 50 MPH. THERE WILL ALSO BE LOCAL GUSTY N WINDS THROUGH
THE COACHELLA VALLEY THIS MORNING...BUT THEY SHOULD REMAIN BELOW
ADVISORY STRENGTH. LOW CLOUDS AND FOG WILL MOSTLY BE IN SAN DIEGO
COUNTY W OF THE MOUNTAINS THIS MORNING BUT THE PASSING TROUGH AND
DEVELOPING OFFSHORE FLOW KEEP STRATUS PATCHY IN ORANGE COUNTY. AREAS
OF COASTAL LOW CLOUDS AND FOG WILL CONTINUE DURING THE NIGHTS AND
MORNINGS THROUGH THE WEEKEND. OTHERWISE...SKIES WILL BE MOSTLY
CLEAR. LOCAL WARMING TODAY...MAINLY IN THE INLAND EMPIRE AND ORANGE
COUNTY. MINOR TEMPS CHANGES IN SAN DIEGO COUNTY W OF THE MOUNTAINS
BUT COOLER IN THE MOUNTAINS AND DESERTS TODAY DUE TO COLD AIR
ADVECTION. WARMER IN MOST AREAS SATURDAY AND SUNDAY WITH MAX TEMPS
INLAND ABOUT 5 TO 10 DEGREES ABOVE SEASONAL AVERAGES.
&&
.LONG TERM (MONDAY-THURSDAY)...A TROUGH APPROACHING FROM THE NW WILL
BRING MORE HIGH CLOUDS AND COOLING MONDAY. DEEPER MARINE LAYER
MONDAY NIGHT AND TUESDAY MORNING. MORE COOLING TUESDAY. PROBABLY NO
MEASURABLE PRECIP TUESDAY...BUT CANNOT COMPLETELY RULE OUT THE
POSSIBILITY OF A FEW LIGHT SHOWERS. FAIR AND WARMER WEDNESDAY AND
THURSDAY UNDER HIGH PRESSURE.
&&
.AVIATION...
190845Z...SHALLOW MOIST LAYER WILL REMAIN OVER AREAS W OF THE MTNS
UNTIL AROUND 18Z THIS MORNING WITH AREAS OF BKN-OVC CIGS FL015 AND
TOPS FL025. OTHERWISE...VFR WITH UNRESTRICTED VIS. STRONG NORTH
FLOW ALOFT WITH POSSIBLE DOWNWIND MOUNTAIN WAVE ACTIVITY OVER THE
INLAND EMPIRE COULD CREATE MODERATE UP AND DOWNDRAFTS AND LOCAL LLWS
AT KONT AND KSNA THROUGH 18Z. ELSEWHERE...LOCAL GUSTY OFFSHORE WINDS
WITH GUSTS TO NEAR 45 KTS AT TIMES THIS MORNING THROUGH AND BELOW
PASSES AND CANYONS.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...
WIND ADVISORY UNTIL 1 PM PDT TODAY FOR THE INLAND EMPIRE AND
SANTA ANA MOUNTAINS AND FOOTHILLS.
&&
$$
PUBLIC...ATKIN
AVIATION...JAD
