Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 240418
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
920 PM PDT THU OCT 23 2014

.SYNOPSIS...
HIGH PRESSURE ALOFT WILL BRING WARM WEATHER THROUGH FRIDAY. COOLER
WITH LOW CLOUDS AND FOG EXTENDING INTO THE COAST AS THE RIDGE SHIFTS
EAST SATURDAY. A TROUGH OF LOW PRESSURE MOVING THROUGH ON SUNDAY
WILL INCREASE WESTERLY WINDS...AND MAY DEEPEN THE MARINE LAYER
ENOUGH FOR SOME PATCHY DRIZZLE WEST OF THE MOUNTAINS. MUCH COOLER
AND BREEZY ON SUNDAY...THEN GRADUAL WARMING THROUGH WEDNESDAY AS THE
UPPER LEVEL RIDGE REBUILDS.

&&

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

SATELLITE IMAGERY SHOWS CLEAR SKIES OVER THE REGION THIS EVENING
WITH PATCHY LOW CLOUDS WELL OFF THE COAST. SURFACE PRESSURE
GRADIENTS ARE WEAKLY ONSHORE TO THE DESERTS...BUT CURRENTLY TRENDING
OFFSHORE. SURFACE DEWPOINTS ALONG THE COAST ARE RUNNING IN THE LOW
60S. GIVEN CURRENT TRENDS EXPECT SOME PATCHY LOW CLOUDS AND DENSE
FOG TO DEVELOP OVER THE COASTAL WATERS TONIGHT. DENSE FOG MAY
BRIEFLY REACH THE BEACHES LATE TONIGHT INTO EARLY FRIDAY
MORNING...BUT SHOULD MOSTLY BE KEPT OFFSHORE BY DRAINAGE FLOW.

FRIDAY WILL BE SLIGHTLY COOLER AS ONSHORE FLOW REDEVELOPS AND THE
UPPER LEVEL RIDGE SHIFTS EASTWARD. OVERALL HIGH TEMPS WILL BE 5 TO
10 DEGREES ABOVE SEASONAL AVERAGES. MORE WIDESPREAD LOW CLOUDS AND
FOG WILL DEVELOP AND MOVE INTO THE COASTAL AREAS FRI NIGHT INTO SAT
MORNING...WITH SOME DENSE FOG POSSIBLE OVER THE HIGHER COASTAL
TERRAIN AND COASTAL MESAS. THE COOLING TREND WILL CONTINUE SATURDAY
AS A LARGE TROUGH OVER THE EASTERN PACIFIC BEINGS TO MOVE INTO THE
WEST COAST. INCREASING ONSHORE FLOW WILL BRING GUSTY SOUTHWEST TO
WEST WINDS IN THE MOUNTAINS AND DESERTS SATURDAY AFTERNOON AND
EVENING. THE TROUGH IS FORECAST TO MOVE THROUGH CA ON
SUNDAY...BRINGING MORE COOLING...A DEEPER MARINE LAYER...AND
CONTINUED BREEZY CONDITIONS IN THE MOUNTAINS AND DESERTS. THE MARINE
LAYER WILL BE DEEP ENOUGH TO SPREAD INTO THE INLAND VALLEYS SAT
NIGHT/SUN MORNING AND GENERATE SOME LIGHT DRIZZLE. HOWEVER...THE
INVERSION WEAKENS SIGNIFICANTLY...SO LOW CLOUD COVERAGE MAY BE
SOMEWHAT PATCHY. SOME CLEARLY IS EXPECTED SUNDAY MORNING...WITH COLD
AIR CUMULUS FORMING WEST OF THE MOUNTAINS IN THE LATE MORNING AND
EARLY AFTERNOON. PATCHY LOW CLOUDS WILL DEVELOP WEST OF THE
MOUNTAINS SUNDAY NIGHT INTO MONDAY MORNING...THOUGH DEVELOPING NORTH
WINDS SHOULD KEEP ANY LOW CLOUDS OUT OF THE INLAND EMPIRE.

FOR MONDAY THROUGH WEDNESDAY...AN UPPER LEVEL RIDGE OF HIGH PRESSURE
WILL BUILD OVER THE SOUTHWEST AND WEAK OFFSHORE FLOW WILL PREVAIL.
THIS WILL BRING AND WARMING AND DRYING TREND THROUGH WEDNESDAY. FAIR
WEATHER IS EXPECTED THROUGH THE PERIOD WITH JUST A FEW HIGH CLOUDS
AT TIMES.

&&

.AVIATION...
240410Z...COAST...PATCHY VERY LOW CLOUDS/DENSE FOG IS POSSIBLE ALONG
THE IMMEDIATE COAST LATE TONIGHT AND EARLY FRIDAY MORNING. CHANCES
OF CIGS/LOW VIS ARE LOW AT MOST COASTAL AIRPORTS...BUT LOCAL CIGS
BELOW 400 FT MSL AND VIS BELOW 1 MI COULD OCCUR VCNTY
KNRS...KSAN...KCRQ AND KOKB BETWEEN 08Z AND 15Z FRI.
OTHERWISE...MOSTLY CLEAR WITH MOST VIS AT/ABOVE 5 MI WILL CONTINUE
THROUGH FRI EVENING.

VALLEYS/MOUNTAINS/DESERTS...MOSTLY CLEAR WITH UNRESTRICTED VIS
THROUGH FRI NIGHT.

&&

.MARINE...
900 PM...PATCHY DENSE FOG WITH VISIBILITY OF ONE MILE OR LESS OVER
THE COASTAL WATERS IS POSSIBLE AGAIN LATE TONIGHT AND FRIDAY
MORNING. OTHERWISE...NO HAZARDOUS MARINE WEATHER CONDITIONS ARE
EXPECTED THROUGH TUESDAY.

&&

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

&&

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

&&

$$

PUBLIC...SS
AVIATION/MARINE...MAXWELL





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