Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 270446
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
930 PM PDT THU MAR 26 2015

.SYNOPSIS...
HIGH PRESSURE ALOFT OVER CALIFORNIA WILL BRING ANOTHER UNSEASONABLY
WARM DAY FRIDAY...THOUGH IT WILL BE A LITTLE BIT COOLER NEAR THE
COAST DUE TO DEVELOPING ONSHORE FLOW. THE COOLING WILL SPREAD INLAND
OVER THE WEEKEND...AND MARINE LAYER CLOUDS WILL RETURN TO THE
COASTAL AREAS. HIGH PRESSURE WILL REBUILD OVER THE REGION MONDAY
WITH SOME WARMING...FOLLOWED BY A SLIGHT COOLING TREND TOWARDS
MIDWEEK.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

SKIES WERE CLEAR THIS EVENING...WITH CONTINUED MILD CONDITIONS DUE
TO A LITTLE BIT OF AN OFFSHORE FLOW INCREASE DURING LATE
AFTERNOON/EARLY EVENING. AT 9 PM...LINDBERGH FIELD WAS STILL 73. THE
UPPER HIGH WAS PRETTY MUCH RIGHT OVERHEAD THIS EVENING...SO WITH
THAT COMBINED WITH MOSTLY OFFSHORE FLOW TODAY...HIGHS WERE MOSTLY IN
THE MID 80S TO MID 90S...INCLUDING 96 AT FULLERTON AND YORBA LINDA.
ONLY ONE RECORD HIGH WAS SET...89 AT CHULA VISTA...BUT LINDBERGH
FIELD DID SET A NEW RECORD FOR MOST 80+ DEGREE DAYS IN MARCH...6.
THEY COULD GO TO 7 DAYS FRIDAY...GIVEN OUR CURRENT PREDICTED HIGH OF
80 THERE.

THE UPPER HIGH WILL MOVE SOUTHEAST FRIDAY AND BE CENTERED OVER
SONORA/ARIZONA WHILE ONSHORE FLOW INCREASES HERE. MODELS HAVE BEEN
CONSISTENT WITH HAVING THE SURFACE CONVERGENCE OVER THE MOUNTAINS BY
FRIDAY AFTERNOON...SO THIS SHOULD COOL THE COAST...THOUGH 850 MB
TEMPS OF AROUND 19 DEG C WILL RESULT IN INLAND EMPIRE LOCATIONS
BEING THE SAME TEMPERATURE FRIDAY AS TODAY. THE LOWER DESERTS COULD
BE EVEN A LITTLE HOTTER FRIDAY. WITH HIGHER COASTAL HUMIDITIES DUE
TO A DEVELOPING MARINE LAYER INVERSION FRIDAY AND FRIDAY
NIGHT...THERE COULD BE FOG...POSSIBLY DENSE...FORMING ALONG THE
COAST FRIDAY NIGHT. FOR TONIGHT...THERE HAVE BEEN REPORTS OF DENSE
FOG ALONG THE CENTRAL AND NORTHERN CALIFORNIA COAST AFTER THEY HAD A
VERY WARM PATTERN LIKE OURS...SO THAT RAISES CONFIDENCE THAT WE
COULD HAVE SOME DENSE FOG HERE AS WELL. WITH THE DEVELOPING MARINE
LAYER AND THE UPPER HIGH CONTINUING TO DRIFT FURTHER TO THE
SOUTHEAST...WE SHOULD HAVE COOLING WEST OF THE MOUNTAINS
SATURDAY...THOUGH THE DESERTS WILL STILL BE HOT...POSSIBLY NEAR 100
IN THE COACHELLA VALLEY. DESPITE THE COOLING...TEMPERATURES SHOULD
STILL BE A LITTLE ABOVE AVERAGE NEAR THE COAST OVER THE WEEKEND.
A TROUGH WILL MOVE THROUGH FROM THE NORTHWEST AROUND
SUNDAY/MONDAY...WITH THE POSSIBILITY OF A WEAK CLOSED LOW DEVELOPING
TO OUR SOUTH. THAT COULD ALLOW FOR SOME WEAK OFFSHORE FLOW AROUND
MONDAY TO BRING BRIEF WARMING AND LESS MARINE STRATUS...AND
ALSO POSSIBLY A FEW CUMULUS CLOUDS OVER THE MOUNTAINS DUE TO
SOME MOISTURE WRAPPING AROUND THE LOW. WEST FLOW ALOFT WILL DEVELOP
TUE/WED WHICH SHOULD BRING BACK THE ONSHORE FLOW AND ANOTHER COOLING
TREND. HOWEVER...TEMPS SHOULD REMAIN SOMEWHAT ABOVE NORMAL...PARTLY
DUE TO THE ABOVE NORMAL LOCAL SEA SURFACE TEMPERATURES...MOSTLY IN
THE MID 60S...BUT WITH SOME READINGS EVEN IN THE UPPER 60S.

&&

.AVIATION...270300Z...HIGH CONFIDENCE FORECAST...CLEAR SKIES AND
UNRESTRICTED VISIBILITIES THROUGH 280000Z. THERE MIGHT BE A FEW
SCATTERED LOW LEVEL CLOUDS ALONG THE COAST TONIGHT...BUT LOW
PROBABILITY OF OCCURRENCE WITH THESE DRY WARM CONIDTIONS. AFTER
280000Z COASTAL AIRPORTS MAY HAVE SOME FOG AND LOW CLOUDS BEGIN TO
DEVELOP LATE NIGHT TOWARD SUNRISE ON SATURDAY...281200Z.

&&

.MARINE...

800 PM...NO HAZARDOUS MARINE WEATHER IS EXPECTED THROUGH MONDAY. OF
INTEREST...SOUTH SWELL OF 3 TO 5 FEET WITH OCCASIONAL 6 FEET CAN BE
EXPECTED TONIGHT THROUGH SUNDAY. THIS IS ALSO MIXED WITH SOME
NORTHWEST SWELL OF 3 TO 4 FEET. MODERATE TO HIGH CONFIDENCE FORECAST.

&&

.BEACHES...

800 PM...A SOUTH SWELL IS GETTING INTO THE AREA TONIGHT WITH A LONG
PERIOD OF 17-20 SECONDS. THIS WILL CREAT STRONG RIP AND LONGSHORE
CURRENTS THIS WEEKEND...AS WELL AS SOMEWHAT ELEVATED SURF ALONG
SOUTH-FACING BEACHES. FOR DETAILS...SEE THE BEACH HAZARDS STATEMENT
LAXCFWSGX.

&&

.SKYWARN... SKYWARN ACTIVATION WILL NOT BE NEEDED FRIDAY.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...BEACH HAZARDS STATEMENT THROUGH SUNDAY AFTERNOON FOR
     ORANGE COUNTY COASTAL AREAS-SAN DIEGO COUNTY COASTAL AREAS.

PZ...NONE.

&&

$$

PUBLIC...MAXWELL
AVIATION/MARINE/BEACHES...PIERCE



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