Area Forecast Discussion
Issued by NWS San Diego, CA

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FXUS66 KSGX 011121
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
420 AM PDT MON SEP 1 2014

.SYNOPSIS...
THROUGH MID WEEK...A LOW PRESSURE SYSTEM TO THE NORTH WILL BRING
SLIGHTLY STRONGER ONSHORE FLOW WITH SLOW COOLING AND GUSTY WEST
WINDS IN THE MOUNTAINS AND DESERTS EACH LATE AFTERNOON THROUGH LATE
EVENING. A WEAK COASTAL EDDY WILL BRING SLOW DEEPENING OF THE MARINE
LAYER INTO LOWER PORTIONS OF THE INLAND VALLEYS THROUGH WEDNESDAY.
TOWARD NEXT WEEKEND...HIGH PRESSURE TO THE SOUTH MAY BEGIN TO EXPAND
NORTHWARD BRINGING SLOW WARMING.

&&

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

.SHORT TERM (TODAY THROUGH WEDNESDAY)...
A LOW PRESSURE SYSTEM OVER THE GULF OF ALASKA WILL MOVE THROUGH THE
PACIFIC NORTHWEST TUESDAY AND REMAIN OVER THE WEST THROUGH
WEDNESDAY. THIS WILL BRING SLIGHTLY STRONGER ONSHORE FLOW FOR
SOUTHERN CALIFORNIA WITH SLOW COOLING AND GUSTY WEST WINDS IN THE
MOUNTAINS AND DESERTS EACH LATE AFTERNOON THROUGH LATE EVENING.

A WEAK COASTAL EDDY WILL CONTINUE INTO WEDNESDAY BRINGING SLOW
DEEPENING OF THE MARINE WITH NIGHT AND MORNING COASTAL LOW CLOUDS
AND FOG PUSHING INTO LOWER PORTIONS OF THE INLAND VALLEYS EARLY
TUESDAY AND WEDNESDAY MORNINGS.

&&

.LONG TERM (THURSDAY THROUGH SUNDAY)...
THE TROUGH OF LOW PRESSURE OVER THE WEST WILL WEAKEN AND HIGH
PRESSURE TO THE SOUTH MAY BEGIN TO EXPAND NORTHWARD. THIS WOULD
ALLOW FOR SLOW WARMING AND A SHALLOWER MARINE LAYER. LOW POPS HAVE
BEEN INTRODUCED FOR NEXT SUNDAY AS THERE IS SOME SMALL POTENTIAL FOR
A RETURN OF SOME MONSOONAL MOISTURE IN THE BROADER CIRCULATION
AROUND A TROPICAL SYSTEM THAT HAS YET TO DEVELOP. DETAILS A WEEK
OUT OF A TROPICAL SYSTEM THAT HAS YET TO DEVELOP HAVE INHERENTLY
LARGE ERRORS.

&&

.AVIATION...
010915Z...COAST/VALLEYS...AREAS OF LOW CLOUDS ARE FORMING ALONG THE
COAST THIS MORNING...AFFECTING ALL THE COASTAL AIRPORTS AT THIS
TIME.  BASES ARE AROUND 800 FEET MSL IN SAN DIEGO AND THEN AROUND
1500 FEET MSL IN ORANGE COUNTY...WITH LOW CLOUDS SPREADING INLAND TO
BETWEEN 10 AND 15 MILES.  CEILINGS MAY LOWER TO BELOW 600 FT MSL
BETWEEN 10Z AND 14Z...WITH AREAS OF VIS 3-5 MILES...LOCALLY AT OR
BELOW 2 MILES ALONG COASTAL MESAS. CLOUDS AND FOG SHOULD CLEAR TO
THE BEACHES BETWEEN 15Z AND 17Z.  CONFIDENCE IN THE TIMING AND
HEIGHTS OF CIGS IS MODERATE AT BEST.

MOUNTAINS/DESERTS...UNRESTRICTED VISIBILITY WITH A FEW TO SCT CLOUDS
AT OR ABOVE 20000 FT.

&&

.MARINE...
215 AM...NO HAZARDOUS MARINE WEATHER EXPECTED THROUGH FRIDAY.

&&

.BEACHES...
215 AM...NO HAZARDOUS MARINE WEATHER EXPECTED THROUGH FRIDAY.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...BEACH HAZARDS STATEMENT THROUGH THIS EVENING FOR THE BEACHES IN
     THE ORANGE COUNTY COASTAL AREAS...SAN DIEGO COUNTY COASTAL
     AREAS.

PZ...NONE.

&&

$$

PUBLIC...17
AVIATION/MARINE...PALMER









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