Issued by NWS San Diego, CA
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000 FXUS66 KSGX 221034 AFDSGX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN DIEGO CA 330 AM PST SUN NOV 22 2009 .SYNOPSIS...PATCHY LOW CLOUDS AND FOG WEST OF THE MOUNTAINS THIS MORNING. OTHERWISE...MOSTLY CLEAR WITH A WARMING TREND THROUGH MID WEEK UNDER BUILDING HIGH PRESSURE WITH WEAK OFFSHORE FLOW. COOLER TOWARD THE END OF THE WEEK AS UPPER LEVEL LOW PRESSURE MOVES THROUGH. && .DISCUSSION...FOR SOUTHWEST CALIFORNIA INCLUDING SAN DIEGO... ORANGE...SOUTHWEST SAN BERNARDINO AND WEST RIVERSIDE COUNTIES. .SHORT TERM (TODAY-TUESDAY)...THERE WERE AREAS OF LOW CLOUDS AND FOG IN THE COASTAL AREAS AND LOCALLY INLAND EARLY THIS MORNING...MAINLY IN SAN DIEGO COUNTY. EARLY MORNING AIRCRAFT SOUNDINGS SHOWED NW WINDS ALOFT. WEAK ONSHORE GRADIENTS TO THE E AND OFFSHORE FROM THE N WITH OFFSHORE TRENDS. THE MARINE LAYER WILL REMAIN DISRUPTED THIS MORNING WITH PATCHY LOW CLOUDS AND FOG...MAINLY IN SAN DIEGO COUNTY. FOG WILL BE LOCALLY DENSE INLAND. FLAT OR WEAKLY CYCLONIC FLOW ALOFT TODAY WITH GRADUALLY INCREASING HEIGHTS. THIS WILL BRING FAIR AND A LITTLE WARMER WEATHER TODAY WITH A FEW HIGH CLOUDS. CLEAR MONDAY AND TUESDAY AS AN UPPER LEVEL RIDGE OF HIGH PRESSURE MOVES OVER THE W. WEAK TO BRIEFLY MODERATE OFFSHORE FLOW WILL DEVELOP MONDAY AND TUESDAY. OFFSHORE WINDS WILL BE MAINLY GRADIENT DRIVEN WITH WEAK UPPER AND THERMAL SUPPORT. THERE WILL BE LOCAL GUSTY OFFSHORE WINDS THROUGH AND BELOW MOUNTAIN CANYONS AND PASSES...ESPECIALLY TUESDAY MORNING WHEN THERE WILL BE A LITTLE BETTER UPPER SUPPORT. MOST WINDS ARE EXPECTED TO REMAIN BELOW ADVISORY STRENGTH WITH ISOLATED GUSTS OF 30 TO 40 MPH IN THE FAVORED AREAS BELOW THE CAJON PASS AND IN THE SANTA ANA MOUNTAIN CANYONS. A LITTLE WARMER MONDAY THEN MORE WARMING TUESDAY W OF THE MOUNTAINS. COOL AT NIGHT IN AREAS PROTECTED FROM THE WINDS. THE WARM DRY OFFSHORE FLOW WILL INCREASE THE FIRE WEATHER HAZARD TUESDAY. && .LONG TERM (WEDNESDAY-SATURDAY)...HIGH PRESSURE ALOFT AND WEAK OFFSHORE FLOW WILL CONTINUE THROUGH MID WEEK. THURSDAY WILL BE THE WARMEST DAY IN MOST AREAS WITH MAX TEMPS INLAND FROM THE COAST ABOUT 6 TO 12 DEGREES ABOVE SEASONAL AVERAGES. THE LONG PERIOD OF WARM DRY OFFSHORE FLOW WILL MAINTAIN AN ELEVATED FIRE WEATHER HAZARD THROUGH THURSDAY. COOLER WITH HIGHER HUMIDITIES...MORE HIGH CLOUDINESS AND A FEW MARINE LAYER CLOUDS FRIDAY AND SATURDAY AS A TROUGH MOVES THROUGH AND ONSHORE FLOW BRIEFLY RETURNS. && .AVIATION... 221030Z...AREAS OF MARINE STRATUS WILL CONTINUE OVER PORTIONS OF SW SAN DIEGO COUNTY THROUGH ABOUT 16Z BEFORE MIXING OUT. OTHERWISE... AREAS OF RADIATION FOG/HAZE WILL LIMIT VIS TO 3SM OR LESS IN SOME VALLEYS DO TO A SHALLOW MOIST LAYER AND LIGHT WINDS. LOCAL VLIFR VIS WILL BE POSSIBLE UNTIL AROUND 14Z VICINITY KONT AND KRNM. BY 18Z VFR CONDITIONS SHOULD PREVAIL INTO THE EVENING. && .SGX WATCHES/WARNINGS/ADVISORIES...NONE. && $$ PUBLIC...ATKIN AVIATION...JAD
