000
FXUS66 KSGX 181110
AFDSGX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
410 AM PDT SAT MAY 18 2013

.SYNOPSIS...
THE TROUGH OF LOW PRESSURE OVER THE SOUTHWEST STATES WILL MOVE
INLAND WITH HIGH PRESSURE OFF THE CALIFORNIA COAST BRINGING A
WARMING AND DRYING TREND INTO MONDAY WITH A DECREASING MARINE LAYER
DEPTH. SURFACE HIGH PRESSURE OVER THE GREAT BASIN WILL BRING LOCALLY
GUSTY NORTHEAST WINDS TO 25 MPH NEAR THE COASTAL FOOTHILLS MONDAY
MORNING. FOR TUESDAY THROUGH FRIDAY...ANOTHER TROUGH OF LOW PRESSURE
WILL MOVE INLAND ALONG THE WEST COAST BRINGING COOLING...A DEEPER
MARINE LAYER...AND GUSTY WEST WINDS IN THE MOUNTAINS AND DESERTS.

&&

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

.SHORT TERM (TODAY THROUGH MONDAY)...
THE TROUGH OF LOW PRESSURE OVER THE SOUTHWEST STATES WILL MOVE
EASTWARD WITH A SECOND TROUGH OF LOW PRESSURE OVER THE PACIFIC
NORTHWEST MOVING THROUGH THE GREAT BASIN SUNDAY NIGHT. HIGH PRESSURE
OFF THE CALIFORNIA COAST WILL BRING AN INLAND WARMING TREND THROUGH
MONDAY. FOR COASTAL AREAS...A WEAK COASTAL EDDY WILL CONTINUE INTO
MONDAY. THIS WILL KEEP COASTAL AREAS COOLER WITH AREAS OF NIGHT AND
MORNING LOW CLOUDS AND FOG. THE MARINE LAYER WILL DECREASE IN DEPTH
THROUGH MONDAY EXTENDING INTO THE LOWER COASTAL SLOPES EARLY THIS
MORNING...INTO PORTIONS OF THE INLAND VALLEYS ON SUNDAY MORNING...
AND INTO THE WESTERN VALLEYS MONDAY MORNING. WITH THE STRENGTHENING
AND LOWERING MARINE INVERSION COMBINED WITH THE CONTINUING WEAK
COASTAL EDDY...CLEARING NEAR THE BEACHES WILL BE SLOWER AND MORE
LIMITED FOR SUNDAY AND MONDAY AFTERNOONS. SURFACE HIGH PRESSURE OVER
THE GREAT BASIN MONDAY BEHIND THE TROUGH OF LOW PRESSURE MOVING
THROUGH THE GREAT BASIN SUNDAY NIGHT WILL BRING LOCALLY GUSTY
NORTHEAST WINDS TO AROUND 25 MPH NEAR THE COASTAL FOOTHILLS MONDAY
MORNING.

&&

.LONG TERM (TUESDAY THROUGH FRIDAY)...
ANOTHER TROUGH OF LOW PRESSURE WILL MOVE INLAND ALONG THE WEST COAST
BRINGING A COOLING TREND FOR TUESDAY THROUGH FRIDAY ALONG WITH
DEEPENING OF THE MARINE LAYER AND GUSTY WEST WINDS IN THE
MOUNTAINS...DESERTS...AND OUTER COASTAL WATERS.

&&

.AVIATION...
180930Z...STRATUS...WITH BASES 1500-3000 FT MSL AND TOPS TO 3800 FT
MSL...HAS DEVELOPED INLAND TO THE WESTERN MTN SLOPES THIS MORNING.
REVERSE CLEARING WILL BE POSSIBLE AGAIN THIS MORNING AS LOW CLOUDS
MAINLY RESIDE OVER THE LAND AND ARE SPARSE OVER THE WATER. STRATUS
COULD OBSCURE LOWER MTN RIDGES. VFR CONDS ARE FORECAST THIS
AFTN...WITH STRATUS RETURNING TO THE COAST THIS EVENING WITH
SLIGHTLY LOWER TOPS AND BASES.

WESTERLY WINDS WITH LOCAL GUSTS AROUND 40 MPH WILL CONTINUE TO
PRODUCE MDT UDDFS AND LLWS OVER AND EAST OF THE MTNS THROUGH THIS
MORNING.

&&

.MARINE...
NORTHWEST WIND GUSTS TO 25 KT WILL CONTINUE TO BE POSSIBLE THROUGH
THIS MORNING. THE STRONGEST WINDS WILL BE AROUND AND SOUTH OF SAN
CLEMENTE ISLAND. COMBINED SEAS TO AROUND 7 FT ARE ALSO FORECAST IN
THE OUTER COASTAL WATERS THROUGH THIS MORNING. CONDITIONS ARE
FORECAST TO FALL BELOW SMALL CRAFT ADVISORY CRITERIA BY SUNRISE.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...WIND ADVISORY UNTIL 5 AM PDT EARLY THIS MORNING FOR THE
     COACHELLA VALLEY...RIVERSIDE COUNTY MOUNTAINS...SAN DIEGO
     COUNTY DESERTS...SAN DIEGO COUNTY MOUNTAINS.

PZ...SMALL CRAFT ADVISORY UNTIL 5 AM PDT EARLY THIS MORNING FOR THE
     WATERS FROM SAN MATEO POINT TO THE MEXICAN BORDER EXTENDING
     30 TO 60 NM OUT INCLUDING SAN CLEMENTE ISLAND.

&&

$$

PUBLIC...17
AVIATION/MARINE...JJT