Area Forecast Discussion
Issued by NWS San Diego, CA

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000 FXUS66 KSGX 020932 AFDSGX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN DIEGO CA 230 AM PDT WED SEP 2 2015 .SYNOPSIS... A LOW PRESSURE TROUGH ALONG THE WEST COAST WILL CONTINUE THE FAIR AND COOL WEATHER THIS WEEK...WITH NIGHT AND MORNING COASTAL LOW CLOUDS EXTENDING WELL INTO THE VALLEYS. LOCALLY GUSTY WEST WINDS WILL DEVELOP EACH AFTERNOON AND EVENING ALONG DESERT MOUNTAIN SLOPES AND THROUGH MOUNTAIN PASSES. SLIGHTLY WARMER WEATHER WILL OCCUR THIS WEEKEND...WITH A MORE SHALLOW MARINE LAYER. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... COASTAL CLOUDS ARE FILLING ALL THE COASTAL AND VALLEY AREAS QUITE EFFICIENTLY THIS MORNING AND WILL PUSH ALL THE WAY TO THE MOUNTAIN SLOPES BY SUNRISE. A WEAK COASTAL EDDY AND A TROUGH OF LOW PRESSURE ALONG THE WEST COAST HAVE ALLOWED OUR MARINE LAYER TO DEEPEN TO ABOUT 3000 FEET. THE EDDY WILL REMAIN RATHER INTERMITTENT BUT THE MARINE LAYER WILL CONTINUE QUITE DEEP THROUGH SATURDAY BECAUSE THE LOW PRESSURE TROUGH WILL DEEPEN OVER THE WEST. COASTAL CLOUDS WILL BE RATHER EXTENSIVE AND PERSISTENT IN THE COMING DAYS...BUT STILL LOTS OF SUNSHINE LATE MORNINGS THROUGH SUNSET. A SMALLER SHORTWAVE THAT HAS BROUGHT US THE HIGHER CLOUDS WILL SLOWLY MOVE NORTHEAST AND PUSH ASIDE THE HIGH CLOUDS EVENTUALLY TODAY. TEMPERATURES WILL BE UNSEASONABLY COOL THROUGH THE FIRST PART OF THE HOLIDAY WEEKEND. HIGHS WILL BE WELL BELOW AVERAGE FOR THIS TIME OF YEAR. NIGHTS WILL CONTINUE ON THE MILD TO WARM SIDE PARTICULARLY NEAR THE COAST BECAUSE OF THE CLOUD COVER AND A WARM SEA SURFACE IN THE MID 70S. GUSTY WESTERLY WINDS WILL DEVELOP EACH LATE AFTERNOON IN THE USUAL CORRIDORS OF MOUNTAIN PASSES INTO ADJACENT DESERTS. THESE WILL BE FAIRLY LOCALIZED AND TOP GUSTS IN TOP SPOTS WILL BE AROUND 40 MPH. THE LOW PRESSURE TROUGH PUSHES INTO THE INTERIOR WEST OVER THE WEEKEND AND HIGH PRESSURE BUILDS JUST A LITTLE SUNDAY AND MONDAY. THAT WILL BRING A MINI WARMING TREND AND SUPPRESS THE MARINE LAYER FOR LESS EXTENSIVE COASTAL CLOUDS FOR THE HOLIDAY; LABOR DAY LOOKS QUITE NICE WITH SEASONAL TEMPERATURES. AS USUAL...MODEL CONSENSUS GOES AWRY FOR DAYS 6 AND 7. RIGHT NOW THEY HANG ON TO A NEUTRAL PATTERN...NEITHER A TROUGH NOR A RIDGE...THAT SAYS A FAIR AND SEASONAL FORECAST IS THE BEST BET FOR NOW. && .AVIATION... 020900Z...COAST/VALLEYS... LOW CLOUDS HAVE SPREAD INLAND TO THE COASTAL SLOPES OF SAN DIEGO COUNTY AND COVER PORTIONS OF THE INLAND EMPIRE...IMPACTING KONT. BASES ARE AROUND 2000 FT MSL AND TOPS ARE NEAR 3000 FT MSL. EXPECT VIS 3SM OR LESS WHERE CLOUDS AND TERRAIN INTERSECT...WITH HIGHER TERRAIN OBSCURED. EXPECT CLEARING TO THE COAST BETWEEN 16Z AND 18Z...HOWEVER A FEW LOW CLOUDS MAY LINGER AT THE BEACHES INTO THE AFTERNOON. LOW CLOUDS COULD BEGIN SPREADING INLAND AGAIN AFT 02Z THU. MTNS/DESERTS...SCT TO BKN CLOUDS AOA 20000 FT WITH UNRESTRICTED VIS THROUGH THURSDAY. && .MARINE... 200 AM...NO HAZARDOUS MARINE WEATHER IS EXPECTED THROUGH SUNDAY. && .BEACHES... 200 AM...SOUTHWEST SWELLS FROM TROPICAL CYCLONES WILL CONTINUE AT LOCAL BEACHES THROUGH TODAY...PRODUCING ELEVATED SURF AND STRONG RIP CURRENTS. SURF WILL BE HIGHEST TODAY WITH MAX SETS TO 5 FT ALONG SOUTHWEST FACING BEACHES NORTH OF OCEANSIDE. THE SOUTH SWELLS WILL SUBSIDE THURSDAY THROUGH EARLY SATURDAY..BEFORE A LONG PERIOD SOUTHERN HEMISPHERE SWELL ARRIVES AT LOCAL BEACHES EARLY NEXT WEEK. && .SKYWARN... SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS. && .SGX WATCHES/WARNINGS/ADVISORIES...NONE. && $$ PUBLIC...MM AVIATION/MARINE/BEACHES...PG

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