Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 251426
AFDSGX

ZCZC LAXWRKAFD 251418
TTAA00 KLAX DDHHMM

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
726 AM PDT MON MAY 25 2015

.SYNOPSIS...
FAIR AND SEASONAL WEATHER IS ON TAP THIS WEEK AS ONSHORE FLOW
MAINTAINS A MODERATE MARINE LAYER WITH NIGHT AND MORNING LOW CLOUDS
AND FOG WEST OF THE MOUNTAINS...AND STRONG LATE MAY SUN WARMS INLAND
AREAS. HIGH PRESSURE ALOFT WILL BRING THE WARMEST WEATHER FOR NEXT
WEEKEND...FOLLOWED BY COOLING AS WE HEAD INTO THE MONTH OF JUNE.

&&

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

ADDING DRIZZLE TO THE FORECAST THIS MORNING...OTHERWISE LITTLE
CHANGE TO THE AFTERNOON AND BALANCE OF THE WEEK.

SATELLITE IMAGERY EARLY THIS MORNING SHOWS MARINE CLOUDS ONCE AGAIN
FILLING THE COASTAL BASIN...WITH A FEW BREAKS OVER INLAND O.C. AND
THE INLAND EMPIRE. WE HAVE HAD SEVERAL REPORTS OF DRIZZLE THIS
MORNING. THE 12Z MIRAMAR SOUNDING HAD A 5 DEGREE C INVERSION BASED
NEAR 3K FT MSL...WITH ABOUT A 1K FT SATURATED LAYER BELOW...AND LIGHT
AND VARIABLE WINDS BELOW 13K FT. SURFACE PRESSURE GRADIENTS WERE
RUNNING 2-4 MBS ONSHORE TO THE DESERTS WITH LIGHT WINDS REPORTED
MOST AREAS.

THE INVERSION LOOKS WEAK ENOUGH...AND THE SATURATED LAYER SHALLOW
ENOUGH TO ALLOW CLEARING MOST AREAS LATER TODAY...AFTER A RATHER
GLOOMY MORNING START WITH DRIZZLE IN SOME AREAS. SOME CLOUDS MAY
LINGER...OR RETURN EARLY TO COASTAL AREAS AS THE ONSHORE FLOW
STRENGTHENS DURING THE AFTERNOON. COMFORTABLE AFTERNOON TEMPERATURES
IN THE 70S ARE EXPECTED MOST AREAS WEST OF THE MOUNTAINS...WHILE THE
DESERTS WARM INTO THE 80S AND 90S.

A VERY GRADUAL WARMING TREND IS ON TAP THIS WEEK AS HEIGHTS/
THICKNESS SLOWLY INCREASE. BETTER WARMING IS LIKELY BY THE WEEKEND
AS A FLAT RIDGE BUILDS OVER THE WEST. THE MARINE LAYER WILL BECOME
MORE SHALLOW BY THE END OF THE WEEK SO LOW CLOUDS AND FOG WILL
SHRINK BACK TO THE WESTERN VALLEYS AND COASTAL AREAS THEN. COOLER
AGAIN NEXT WEEK AS A LOW PRESSURE TROUGH BRINGS STRONGER ONSHORE
FLOW.

&&

.AVIATION...
251425...COAST/VALLEYS...OVC-BKN STRATUS...WITH BASES AROUND 2000 FT
MSL...TOPS 3000-3500 FT MSL...LOCAL VIS OF 3-5 SM...AND MTN
OBSCURATION OF LOWER COASTAL SLOPES...WILL LIKELY GRADUALLY CLEAR
THROUGH 2100 UTC...WITH SCT-BKN CLOUDS 2500-3500 FT MSL POSSIBLY
LINGERING WITHIN 5 SM OF THE COAST THROUGH 26/0200 UTC. MARINE LAYER
INVERSION OF 5 DEG C THIS MORNING. 26/0200-1500 UTC...OVC STRATUS RE-
DEVELOPING...WITH BASES 1500-2000 FT MSL AND TOPS AROUND 3000 FT
MSL. FORECAST CONFIDENCE IS MODERATE-TO-HIGH.

MTNS/DESERTS...UNRESTRICTED VIS THROUGH TUESDAY MORNING. SKC THROUGH
2100 UTC...THEN BECOMING SCT-BKN CLOUDS AOA 20000 FT MSL BY 26/0600
UTC.

&&

.MARINE...
725 AM...NO HAZARDOUS MARINE WEATHER IS EXPECTED THROUGH FRIDAY.

&&

.BEACHES...
725 AM...NEARSHORE BUOYS SHOW THE SOUTH SWELL AT 2-3 FEET WITH 16
SECOND PERIODS THIS MORNING. THE SWELL SHOULD PEAK TODAY...THEN
SLOWLY DECLINE TONIGHT THOUGH WEDNESDAY. THIS SWELL WILL PRODUCE
STRONG RIP AND LONGSHORE CURRENTS AT THE BEACHES THROUGH THIS
EVENING...ALONG WITH SOME ELEVATED SURF IN THE SOUTH SWELL FAVORED
BEACHES OF ORANGE COUNTY AND NORTHERN SAN DIEGO COUNTY. A BEACH
HAZARDS STATEMENT REMAINS IN EFFECT FOR THE ORANGE AND SAN DIEGO
COUNTY BEACHES.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...

CA...BEACH HAZARDS STATEMENT THROUGH THIS EVENING FOR ORANGE COUNTY
     COASTAL AREAS-SAN DIEGO COUNTY COASTAL AREAS.

PZ...NONE.

&&

$$

PUBLIC...JAD
AVIATION/MARINE/BEACHES...HARRISON



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