Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 272035
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
130 PM PDT FRI MAR 27 2015

.SYNOPSIS... HIGH PRESSURE ALOFT OVER CALIFORNIA WILL WEAKEN AND
SHIFT EAST OVER ARIZONA ALLOWING A RETURN OF ONSHORE FLOW AND THE
POSSIBILITY OF DENSE FOG ALONG THE COAST TONIGHT. COOLING WILL
GRADUALLY SPREAD INLAND OVER THE WEEKEND AS A WEAK TROUGH OF LOW
PRESSURE DRIFTS ACROSS SOUTHERN CALIFORNIA. HIGH PRESSURE WILL
REBUILD OVER THE REGION MONDAY FOR MINOR WARMING AND WEAK OFFSHORE
FLOW. ANOTHER WEAK TROUGH WILL BRING COOLING AND STRONGER ONSHORE
FLOW TUESDAY AND WEDNESDAY.

&&

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

IT CONTINUES TO BE ANOTHER WARM DAY ACROSS SOUTHERN CALIFORNIA WITH
TEMPERATURES MOSTLY IN THE 80S AND 90S INLAND. COASTAL TEMPERATURES
ARE CURRENTLY IN THE 70S TO MID 80S DUE TO THE MODERATING EFFECTS OF
THE SEA BREEZE AND A SLOWLY DEEPENING MARINE LAYER.

THE AIRMASS WAS STILL VERY DRY WITH DEWPOINTS IN THE 30S AND 40S
MOST AREAS...BUT WERE INCREASING NEAR THE COAST WHERE THE DEWPOINT
HAD RISEN TO 55 AT IMPERIAL BEACH AT 9 AM. PRESSURE GRADIENTS ARE
TRENDING STRONGER ONSHORE AND A SHALLOW MARINE LAYER WILL SPREAD
INTO THE COASTAL ZONES TONIGHT. AS A RESULT...AREAS OF DENSE FOG ARE
A CONCERN ALONG THE COAST TONIGHT...THOUGH CONFIDENCE IN TIMING IS
LOW TO MODERATE. SATURDAY WILL BE SEVERAL DEGREES COOLER IN THE
COASTAL ZONES BUT THE INLAND AND DESERT LOCATIONS WILL CONTINUE TO
BE VERY WARM...NEARING OR BREAKING HIGH TEMPERATURE RECORDS AGAIN.
SATURDAY WILL LIKELY BE THE HOTTEST DAY IN THE LOWER DESERTS WHERE
THE THERMOMETER ARE FORECAST TO REACH 100 DEGREES IN THE COACHELLA
VALLEY.

SUNDAY THROUGH THURSDAY...ON SUNDAY A WEAK UPPER LEVEL TROUGH WILL
BRING COOLING TO ALL AREAS ALONG WITH SOME HIGH CLOUDS. MARINE LAYER
CLOUDS WILL SPREAD INTO THE WESTERN VALLEYS SUNDAY MORNING. MONDAY
WILL BE SLIGHTLY WARMER WITH WEAK OFFSHORE FLOW FROM WEAK RIDGING
ALOFT. BEHIND THIS RIDGE...A SHORTWAVE PASSING BY TO THE NORTH WILL
BRING GUSTY WEST WINDS TO THE MOUNTAINS AND DESERTS. ZONAL FLOW
RETURNS WEDNESDAY AND THURSDAY WITH TEMPERATURES REMAINING SLIGHTLY
ABOVE AVERAGE ACROSS THE REGION. THE EXCEPTION WILL BE NEAR THE
COAST WHERE TEMPERATURES WILL BE CLOSER TO AVERAGE DUE TO A SHALLOW
MARINE LAYER.

&&

.AVIATION...
272100Z...CLEAR SKIES AND UNRESTRICTED VIS THROUGH THE
EVENING. AT THE COAST CONFIDENCE IS HIGH THAT FOG WILL DEVELOP
OVERNIGHT...BUT CONFIDENCE IS LOW ON ITS EXACT TIMING. INITIALLY IT
WILL BE LOW WITH CIGS AROUND 100-400 FEET MSL AND AREAS OF VIS
1/4SM. THIS WILL LIFT AND CLEAR RAPIDLY AFTER SUNRISE SATURDAY AND
SCATTER OUT BY 15-16Z.

&&

.MARINE...

200 PM...PATCHY DENSE FOG TONIGHT...OTHERWISE NO HAZARDOUS MARINE
WEATHER IS EXPECTED THROUGH TUESDAY.

&&

.BEACHES...
200 PM...A SOUTH SWELL WITH A LONG PERIOD WILL CREATE
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 IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.

&&

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

PZ...NONE.

&&

$$

PUBLIC...MOEDE/23
AVIATION/MARINE/BEACHES...MM



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