Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 301008
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
310 AM PDT MON MAR 30 2015

.SYNOPSIS...

A LOW PRESSURE SYSTEM MOVING INLAND TO THE NORTH ON TUESDAY AND A
SECOND LOW PRESSURE SYSTEM MOVING INLAND THROUGH CALIFORNIA ON
WEDNESDAY WILL BRING STRONGER ONSHORE FLOW INTO THURSDAY WITH NIGHT
AND MORNING COASTAL LOW CLOUDS AND FOG...INLAND COOLING...AND GUSTY
WEST WINDS IN THE MOUNTAINS AND DESERTS. OFFSHORE FLOW AND HIGH
PRESSURE ALOFT WILL BRING WARMING ON FRIDAY WITH GUSTY NORTHEAST
WINDS NEAR THE COASTAL FOOTHILL. FOR NEXT WEEKEND...A LOW PRESSURE
SYSTEM DEVELOPING OVER THE EASTERN PACIFIC WILL BRING A COOLING
TREND.

&&

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

A TROUGH OF LOW PRESSURE MOVING INLAND TO THE NORTH ON TUESDAY AND A
SECOND TROUGH OF LOW PRESSURE MOVING INLAND THROUGH CALIFORNIA ON
WEDNESDAY WILL BRING STRONGER ONSHORE FLOW WITH AN INLAND COOLING
TREND INTO WEDNESDAY OR THURSDAY. THE STRONGER ONSHORE FLOW WILL
BRING PERIODS OF GUSTY WEST WINDS TO THE MOUNTAINS AND DESERTS.
WINDS ARE MOSTLY EXPECTED TO REMAIN BELOW ADVISORY STRENGTH...BUT
COULD APPROACH ADVISORY STRENGTH WEDNESDAY NIGHT ON THE DESERT
SLOPES OF THE NORTH/SOUTH MOUNTAIN RANGES INTO THE ADJACENT DESERT
AREAS.

RECENT AIRCRAFT SOUNDINGS SHOW THE DEPTH OF THE MARINE LAYER AROUND
1200 FEET WITH SATELLITE IMAGERY SHOWING MORE EXTENSIVE STRATUS OVER
THE COASTAL WATERS EXTENDING LOCALLY INLAND ACROSS THE ORANGE COUNTY
COASTAL PLAIN AND INLAND IN SAN DIEGO COUNTY AS FAR THE FAR WESTERN
VALLEYS. FOG COULD BRIEFLY BE LOCALLY DENSE NEAR THE MESAS AND OTHER
HIGHER COASTAL TERRAIN. THE STRONGER ONSHORE FLOW...WEAK NIGHT AND
MORNING COASTAL EDDIES...AND SLOW LOWERING OF HEIGHTS ALOFT FROM THE
PAIR OF WEST COAST TROUGH PASSAGES IS EXPECTED TO RESULT IN GRADUAL
DEEPENING OF THE MARINE LAYER INTO WEDNESDAY WITH NIGHT AND MORNING
COASTAL LOW CLOUDS AND FOG EXTENDING INLAND INTO PORTIONS OF THE
WESTERN VALLEYS TONIGHT INTO TUESDAY MORNING...AND INTO PORTIONS OF
THE INLAND VALLEYS FOR TUESDAY NIGHT INTO WEDNESDAY MORNING.

FOR FRIDAY...HIGH PRESSURE ALOFT AND WEAK OFFSHORE FLOW WILL BRING
WARMING WITH GUSTY NORTHEAST WINDS NEAR THE COASTAL FOOTHILLS.
GRADUALLY COOLER FOR NEXT WEEKEND AS A TROUGH OF LOW PRESSURE
DEVELOPS OVER THE EASTERN PACIFIC.

&&

.AVIATION...

300900Z...LOW CLOUDS BASED AT AROUND 1000 FEET MSL WILL CONTINUE TO
COVER COASTAL AREAS THROUGH SUNRISE WITH ISOLATED VIS REDUCTION
BELOW 1SM MAINLY ALONG INLAND EXTENT OF CLOUDS. SCATTER OUT IS
EXPECTED BY 16Z THIS MORNING. LOW CLOUDS WILL SPREAD INTO COASTAL
AREAS AFTER 04Z TONIGHT WITH BASES AROUND 1200 FEET MSL.
OTHERWISE...MOSTLY CLEAR AND VFR CONDITIONS TODAY AND TONIGHT.

&&

.MARINE...

200 AM...NO HAZARDOUS MARINE WEATHER IS EXPECTED THROUGH FRIDAY.


&&

.SKYWARN...
SKYWARN ACTIVATION WILL NOT BE NEEDED TODAY.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
PZ...NONE.
&&

$$

PUBLIC...17
AVIATION/MARINE...MM


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