Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 210951
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
255 AM PDT MON APR 21 2014

.SYNOPSIS...
HIGH PRESSURE WILL BRING MINOR WARMING AND A SHALLOWER MARINE LAYER
TODAY WITH AREAS OF EARLY MORNING LOW CLOUDS AND LOCALLY DENSE FOG
EXTENDING INLAND TO THE FAR WESTERN VALLEYS. FOR TUESDAY AND EARLY
WEDNESDAY...A TROUGH OF LOW PRESSURE WILL MOVE INLAND ALONG THE WEST
COAST BRINGING COOLING...DEEPENING OF THE MARINE LAYER...AND STRONG
GUSTY WEST WINDS IN THE MOUNTAINS AND DESERTS. WEAKER WINDS AND
MODEST WARMING FOR THURSDAY AND FRIDAY. THEN ANOTHER STRONGER TROUGH
OF LOW PRESSURE FRIDAY NIGHT AND SATURDAY WILL BRING COOLING...
DEEPENING OF THE MARINE LAYER...STRONG GUSTY WEST WINDS IN THE
MOUNTAINS AND DESERTS...AND A CHANCE OF PRECIPITATION. DRY WITH SLOW
WARMING FOR SUNDAY.

&&

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

.SHORT TERM (TODAY THROUGH WEDNESDAY)...
THE MARINE LAYER REMAINS NEAR 1200 FEET DEEP. SATELLITE IMAGERY
SHOWS AREAS OF STRATUS OVER THE COASTAL WATERS EXTENDING LOCALLY
INLAND. SO FAR THERE HAS BEEN LITTLE FOG. HOWEVER...GIVEN THE DEPTH
OF THE MARINE LAYER...STRATUS COULD EXTEND INLAND INTO THE MESAS AND
FAR WESTERN VALLEYS EARLY THIS MORNING WITH LOCALLY DENSE FOG NEAR
HIGHER COASTAL TERRAIN...AND FROM THE MESAS INTO THE FAR WESTERN
VALLEYS. HIGH PRESSURE ALOFT WILL BRING SLIGHT WARMING FOR TODAY.
FOR TUESDAY AND EARLY WEDNESDAY...A TROUGH OF LOW PRESSURE MOVING
QUICKLY INLAND THROUGH CALIFORNIA WILL BRING COOLING...DEEPENING OF
THE MARINE LAYER...AND STRONG GUSTY WINDS IN THE MOUNTAINS AND
DESERTS. LOCAL WIND GUIDANCE CONTINUES TO SUPPORT ADVISORY STRENGTH
WINDS.

&&

.LONG TERM (THURSDAY THROUGH SUNDAY)...
FOR THURSDAY...DRY WITH SLIGHTLY ABOVE AVERAGE HIGH TEMPERATURES FOR
INLAND AREAS UNDER HIGH PRESSURE. FOR FRIDAY...INCREASING ONSHORE
FLOW WILL BRING A COOLING TO NEAR AVERAGE HIGH TEMPERATURES WITH
GUSTY WEST WINDS IN THE MOUNTAINS AND DESERTS. FOR FRIDAY NIGHT AND
SATURDAY...A TROUGH OF LOW PRESSURE WILL MOVE INLAND THROUGH
CALIFORNIA BRINGING STRONGER ONSHORE FLOW WITH COOLING...DEEPENING
OF THE MARINE LAYER...STRONG GUSTY WEST WINDS IN THE MOUNTAINS AND
DESERTS...AND A CHANCE OF PRECIPITATION ALONG AND WEST OF THE
MOUNTAINS. DRY WITH A WARMING TREND BEGINNING SUNDAY AS THE TROUGH
OF LOW PRESSURE MOVES INLAND INTO THE ROCKIES AND WESTERN PLAINS
STATES.

&&

.AVIATION...
210930Z...LOW CLOUDS WILL COVER MAINLY COASTAL AREAS THIS MORNING
WITH BASES AROUND 800 FEET ASL AND LOCAL VIS INLAND 2-5SM. SCATTER
OUT EXPECTED BY 16-17Z. LOW CLOUDS WILL MOVE ASHORE AND INTO COASTAL
AIRPORTS AROUND 02-06Z THIS EVENING. BASES WILL BE AROUND 1000 FEET
ASL...BUT WILL RISE AS THEY MOVE INTO INLAND VALLEYS OVERNIGHT.
OTHERWISE...MOSTLY CLEAR AND VFR CONDITIONS.

&&

.MARINE...
STRONG NORTHWEST WINDS WILL DEVELOP TUESDAY AND CONTINUE TUESDAY
NIGHT. LARGE NORTHWEST SWELL WILL ARRIVE TUESDAY AFTERNOON AND
EVENING AND PEAK EARLY WEDNESDAY. THE COMBINATION OF WINDS AND SWELL
WILL MAKE CONDITIONS HAZARDOUS FOR SMALL CRAFT. SEE LAXMWWSGX FOR
DETAILS. WINDS WILL DIMINISH RAPIDLY LATE TUESDAY NIGHT WHILE SWELL
GRADUALLY DECREASES LATER WEDNESDAY.

FRIDAY AND SATURDAY...FAIRLY HIGH CONFIDENCE THAT ANOTHER WEATHER
SYSTEM WILL BRING MORE STRONG WINDS AND LARGE SWELL.

&&

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










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