Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 231122
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
420 AM PDT SAT MAY 23 2015

.SYNOPSIS...
A LOW PRESSURE SYSTEM MOVING EASTWARD THROUGH THE GREAT BASIN TODAY
WILL MAINTAIN STRONGER ONSHORE FLOW WITH GUSTY WEST WINDS
IN THE MOUNTAINS AND DESERTS AND A FEW LINGERING SHOWERS EARLY
THIS MORNING. A FAST MOVING LOW PRESSURE SYSTEM FROM THE NORTH WILL
BRING ANOTHER CHANCE OF SHOWERS LATE TONIGHT INTO SUNDAY MORNING.
LOW PRESSURE ALOFT AND ONSHORE FLOW WILL GRADUALLY WEAKEN THROUGH
THE WEEK WITH A SLOW INLAND WARMING TREND AND A GRADUALLY SHALLOWER
MARINE LAYER.

&&

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

.SHORT TERM (TODAY THROUGH MEMORIAL DAY)...
A LOW PRESSURE SYSTEM CENTERED OVER THE GREAT BASIN WILL CONTINUE TO
MOVE EASTWARD TODAY. THIS WILL MAINTAIN STRONGER ONSHORE FLOW WITH
PERIODS OF STRONGER AND GUSTY WEST WINDS IN THE MOUNTAINS AND
DESERTS...STRONGEST AND MOST WIDESPREAD IN PORTIONS OF THE LOWER
DESERTS FOR LATE THIS AFTERNOON THROUGH LATE THIS EVENING. A FEW
RESIDUAL LIGHT SHOWERS WILL CONTINUE EARLY THIS MORNING...WITH
GREATEST COVERAGE IN THE CENTRAL AND SOUTHERN SAN DIEGO COUNTY
COASTAL AND VALLEY AREAS.

A FAST MOVING SHORTWAVE FROM THE NORTH WILL MOVE SOUTHWARD THROUGH
SOUTHERN CALIFORNIA LATE TONIGHT AND EARLY SUNDAY...MOVING INTO
SOUTHERN ARIZONA LATE SUNDAY. THIS WILL BRING A SLIGHT CHANCE OF
SHOWERS ALONG AND WEST OF THE MOUNTAINS LATE TONIGHT INTO SUNDAY
MORNING WITH GREATEST PRECIPITATION CHANCES FOR SAN DIEGO COUNTY.

FOR MEMORIAL DAY...WEAK HIGH PRESSURE WILL BRING INLAND WARMING AND
A MARINE LAYER THAT IS NOT QUITE AS DEEP.

&&

.LONG TERM (TUESDAY THROUGH FRIDAY)...
WEAK HIGH PRESSURE WILL CONTINUE THROUGH TUESDAY WITH A WEAK TROUGH
OF LOW PRESSURE MOVING INLAND THROUGH SOUTHERN CALIFORNIA ON
WEDNESDAY FOLLOWED BY HIGH PRESSURE INTO NEXT WEEKEND. 500 MB
HEIGHTS WILL CHANGE LITTLE FOR MONDAY THROUGH WEDNESDAY...THEN BEGIN
TO RISE INTO NEXT WEEKEND. INLAND AREAS WILL CONTINUE TO SLOWLY WARM
FOR TUESDAY THROUGH FRIDAY WITH THE MARINE LAYER BECOME GRADUALLY
SHALLOWER THROUGH THE WEEK.

&&

.AVIATION...

230930Z...WIDESPREAD LOW CLOUDS...WITH BASES FROM 2500-4000 FT
MSL...WILL CONTINUE OVER AND WEST OF THE MOUNTAINS THIS MORNING.
EXPECT ONLY PARTIAL CLEARING AFT 18Z...WITH MANY LOCATIONS REMAINING
SCT/BKN THROUGHOUT THE DAY. COVERAGE INCREASES AGAIN THIS EVENING.

WEST WINDS GUSTING TO 35-45 KT WILL CONTINUE TO BRING MOD-STG
UDDFS AND LLWS OVER AND EAST OF THE MTNS THROUGH TODAY.

&&

.MARINE...

230 AM...NO HAZARDOUS MARINE WEATHER IS EXPECTED THROUGH WEDNESDAY.

&&

.BEACHES...

230 AM...LONG-PERIOD SOUTH SWELLS ARRIVING ON SUNDAY WILL PEAK
MONDAY AT 3 FT WITHA PERIOD OF 16 SECONDS...AND GRADUALLY LOWER
TUESDAY INTO WEDNESDAY. THESE SWELLS WILL LIKELY PRODUCE STRONG RIP
AND LONGSHORE CURRENTS SUNDAY THROUGH MONDAY...WITH SOME ELEVATED
SURF IN ORANGE COUNTY AND NORTHERN SAN DIEGO COUNTY.

&&

.SKYWARN...
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...WIND ADVISORY UNTIL 2 AM PDT SUNDAY FOR SAN DIEGO COUNTY DESERTS-
     SAN GORGONIO PASS NEAR BANNING.

     BEACH HAZARDS STATEMENT FROM SUNDAY MORNING THROUGH MONDAY
     EVENING FOR ORANGE COUNTY COASTAL AREAS-SAN DIEGO COUNTY
     COASTAL AREAS.

PZ...NONE.
&&

$$

PUBLIC...17
AVIATION/MARINE/BEACHES...PG



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