Area Forecast Discussion
Issued by NWS San Diego, CA

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000 FXUS66 KSGX 062019 AFDSGX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN DIEGO CA 117 PM PDT MON JUL 6 2015 .SYNOPSIS... LOW PRESSURE MOVING SLOWLY INLAND OVER CENTRAL CALIFORNIA THROUGH THURSDAY WILL CONTINUE TO DEEPEN THE MARINE LAYER...BRINGING COOLER DAYS AND GUSTY WESTERLY WINDS WELL INLAND INTO THE DESERTS. THE DEEP MARINE LAYER MAY LEAK SOME PATCHY DRIZZLE AT TIMES...ESPECIALLY LATE NIGHTS AND MORNINGS AS THE CLOUD LAYER THICKENS. CLEARING MAY BE LIMITED SOME DAYS WEST OF THE MOUNTAINS... WHILE INLAND...FAIR SKIES PREVAIL. THE SUBTROPICAL HIGH WILL BEGIN TO BUILD BACK TO THE WEST BY THE WEEKEND...WHICH WILL DECREASE THE MARINE LAYER AND BRING WARMER DAYS INTO NEXT WEEK. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... ONCE AGAIN IT WAS A SLOW BURN OFF OF THE THICK MARINE CLOUDS TODAY WEST OF THE MTS. SOME AREAS EVEN REPORTED A WETTING DRIZZLE THIS MORNING. AT NOON...MANY LOCATIONS STILL HAD TEMPERATURES IN THE UPPER 60S AND 70S WEST OF THE MOUNTAINS...WHILE THE DESERTS HAD RISEN INTO THE 90S. MEANWHILE FULL SUNSHINE OVER THE MTS HAD BOILED UP A FEW THUNDERSTORMS...MAINLY IN SAN BERNARDINO COUNTY. SOME OF THESE WERE STRONG WITH POSSIBLE GUSTY WINDS AND HEAVY DOWNPOURS. THE SHWRS/TSTMS WILL DECREASE AROUND SUNSET AND SHOULD NOT MAKE A RETURN APPEARANCE TOMORROW AS MUCH DRIER AIR OVERSPREADS THE REGION ON STRONG SW WINDS ALOFT. LOW PRESSURE OFF THE CA COAST WILL SLOWLY MOVE INLAND OVER CENTRAL PORTIONS OF THE STATE BY THU. FALLING/HEIGHTS AND THICKNESS WILL MAINTAIN MODERATE TO STRONG ONSHORE FLOW FOR THIS TIME OF YEAR AND FURTHER COOLING THROUGH THU...ESPECIALLY INLAND WHERE MAX TEMPS WILL BE AROUND TEN DEGREES F BELOW AVERAGE. THE DRYING ALOFT WILL SNUFF OUT ANY CHANCE FOR SHWRS/TSTMS AFTER TODAY...BUT THE MARINE LAYER AND ASSOCIATED CLOUDS WILL REMAIN UNSEASONABLY THICK...RESULTING IN MORE OF A JUNE GLOOM SITUATION WITH PATCHY DRIZZLE POSSIBLE AT TIMES AND LIMITED CLEARING WEST OF THE MOUNTAINS. GRADUALLY WARMER THIS COMING WEEKEND INTO EARLY NEXT WEEK AS THE MARINE LAYER DECREASES UNDER BUILDING HIGH PRESSURE. THE SUBTROPICAL HIGH CENTER IS FORECAST TO RETROGRADE FORM THE GULF COAST REGION FRI...TO THE SOUTHERN ROCKIES MON. THIS WILL BULLY OUT THE LOW PRESSURE TROUGH AND BEGIN TO TEASE US WITH MONSOONAL MOISTURE BY TUE AS OUR MID-LEVEL WINDS SWITCH FROM SW TO SOUTH. && .AVIATION... 062000Z...COAST/VALLEYS...BKN-OVC STRATUS 1800-2500 FT MSL LINGERING WITHIN 10 SM OF THE SAN DIEGO COUNTY COAST THROUGH 07/0200 UTC...INCLUDING KCRQ AND KSAN. FOR ORANGE COUNTY COAST...STRATUS SHOULD CONTINUE TO GRADUALLY CLEAR TO THE COASTAL WATERS THROUGH 2200 UTC. MOSTLY SKC AND UNRESTRICTED VIS ELSEWHERE. 07/0200-1500 UTC...OVC STRATUS FILLING IN OVER THE COAST AND VALLEYS AGAIN...WITH BASES 1800-2200 FT MSL AND TOPS 3000-3500 FT MSL. FORECAST CONFIDENCE MODERATE-TO-HIGH. SLOW CLEARING AGAIN AFTER 07/1500 UTC. MTNS/DESERTS...SCT-BKN CLOUDS WITH ISOLATED SHOWERS AND THUNDERSTORMS POSSIBLE THROUGH 07/0200 UTC OVER THE MTNS AND DESERTS...WITH BASES 8000-10000 FT MSL AND CB TOPS TO 40000 FT MSL. OTHERWISE...UNRESTRICTED VIS THROUGH TUESDAY MORNING. && .MARINE... 113 PM...NORTHWEST WINDS COULD GUST TO 25 KT IN THE OUTER WATERS THURSDAY EVENING. OTHERWISE...NO HAZARDOUS MARINE WEATHER IS EXPECTED THROUGH SATURDAY. && .SKYWARN... SKYWARN ACTIVATION WILL NOT BE NEEDED ON TUESDAY. HOWEVER...WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...NONE. PZ...NONE. && $$ PUBLIC...JAD AVIATION/MARINE...HARRISON

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