Area Forecast Discussion
Issued by NWS San Diego, CA

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000 FXUS66 KSGX 041139 AFDSGX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN DIEGO CA 339 AM PST WED MAR 4 2015 .SYNOPSIS...BUILDING HIGH PRESSURE ALOFT AND OFFSHORE FLOW WILL BRING DRY AND WARMER DAYS THROUGH THE WEEKEND. TURNING COOLER NEXT WEEK...WITH AREAS OF NIGHT AND MORNING LOW CLOUDS RETURNING. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... SATELLITE LOOPS SHOW SOME THIN MID AND HIGH LEVEL CLOUDS PERSISTING ACROSS INLAND SOUTHERN CALIFORNIA EARLY THIS MORNING. THICKER MID LEVEL CLOUDS PRODUCED SOME LIGHT RAIN OR SPRINKLES LATE LAST EVENING IN THE COACHELLA VALLEY...ALTHOUGH NO MEASURABLE RAIN OCCURRED. DIFFLUENT FLOW AND WEAK PVA WILL CONTINUE TO PRODUCE SOME PATCHY HIGH CLOUDS THIS MORNING BUT WILL GENERALLY GIVE WAY TO MAINLY SUNNY SKIES LATER TODAY ACROSS THE REGION. A SLOW WARMING TREND WILL COMMENCE TODAY WITH TEMPERATURES 3-5 DEGREES WARMER GENERALLY ACROSS THE REGION ALTHOUGH COOL NORTHERLY FLOW TODAY WILL LIMIT SUBSTANTIAL WARMING FROM TAKING PLACE. ON THURSDAY...A BROAD AND STRENGTHENING UPPER LEVEL HIGH PRESSURE CELL WILL SPREAD ACROSS THE EASTERN PACIFIC AND INTO NORTHERN CALIFORNIA...AND DOMINATE CALIFORNIA WEATHER BY FRIDAY. THIS PATTERN WILL BRING SUBSTANTIAL WARMING ACROSS ALL AREAS...WITH THE STRONGEST WARMING ACROSS THE INLAND VALLEYS WHERE OFFSHORE FLOW WILL ALSO HELP TO HEAT THINGS UP A BIT. THE WARMEST READINGS WILL OCCUR THIS WEEKEND...WITH TEMPS RANGING FROM MID 70S NEAR THE COAST TO LOWER 80S INLAND ON SATURDAY AND SUNDAY...SOME 10 TO 15 DEGREES ABOVE NORMAL...WITH THE WARMEST AIR ALOFT AND CONTINUED OFFSHORE FLOW. OFFSHORE FLOW PATTERN WILL ALSO BRING DIURNALLY DRIVEN GUSTY N/NE WINDS ALONG THE WESTERN MOUNTAIN SLOPES WEST THROUGH THE VALLEYS. STRONGEST WINDS ARE EXPECTED BY FRIDAY WITH GUSTS OF 50 TO 60 MPH POSSIBLE...WHICH MAY EVENTUALLY REQUIRE A WIND ADVISORY FOR THE INLAND VALLEYS. WESTERLY FLOW WILL DEVELOP AROUND TUESDAY NEXT WEEK AS AN APPROACHING UPPER LEVEL LOW SLOWLY BREAKS DOWN THE STRONG WEST COAST RIDGE. COOLER TEMPERATURES AND SOME COASTAL LOW CLOUDS WILL BE POSSIBLE. THE MEDIUM RANGE MODELS ARE IN FAIR AGREEMENT TO BREAK DOWN THE RIDGE WITH AT LEAST A SLIGHT CHANCE FOR PRECIPITATION BY WEDNESDAY AS A FAIRLY STRONG UPPER LOW EVENTUALLY WORKS INTO CALIFORNIA. ZONAL FLOW THEN LIKELY TO CONTINUE THROUGH THE REMAINDER OF NEXT WEEK WITH THE POTENTIAL FOR ADDITIONAL LOWS TO WORK SOUTHEAST AND INTO CALIFORNIA. && .AVIATION... 041000Z...MOSTLY CLEAR AND VFR CONDITIONS WILL CONTINUE TODAY AND TONIGHT. THROUGH 22Z TODAY GUSTY NORTH TO NORTHEAST WINDS WILL PUSH THROUGH THE SAN BERNARDINO MOUNTAINS SOUTHWARD BELOW CAJON PASS AND INTO PARTS OF THE INLAND EMPIRE AND NORTHEAST ORANGE COUNTY. LLWS IS PROBABLE BEFORE THIS WIND SURFACES IN PLACES LIKE KONT THROUGH 15Z. && .MARINE... 200 AM...NO HAZARDOUS MARINE WEATHER IS EXPECTED THROUGH SUNDAY. && .SKYWARN... SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...NONE. PZ...NONE. && $$ PUBLIC...BROTHERTON AVIATION/MARINE...MM

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