High Surf Advisory 9, NWS San Diego, CA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
930 PM PDT MON MAR 29 2010

.SYNOPSIS...A REDEVELOPING MARINE LAYER WILL CAUSE LOW CLOUDS AND
FOG WEST OF THE MOUNTAINS DURING THE NIGHTS AND MORNINGS THROUGH
TUESDAY. A PACIFIC STORM WILL BRING RAIN AND MOUNTAIN SNOW WITH
LOCAL STRONG GUSTY WINDS AND MUCH COOLER WEATHER WEDNESDAY AND
THURSDAY. CHANCE OF THUNDERSTORMS WEDNESDAY NIGHT AND THURSDAY. DRY
AND WARMER FRIDAY INTO SUNDAY. ANOTHER PACIFIC STORM COULD BRING
SHOWERS SUNDAY NIGHT AND MONDAY.

&&

.DISCUSSION...FOR SOUTHWEST CALIFORNIA INCLUDING SAN DIEGO...
ORANGE...SOUTHWEST SAN BERNARDINO AND WEST RIVERSIDE COUNTIES.

.SHORT TERM (TONIGHT-THURSDAY)...SKIES WERE MOSTLY CLEAR THIS
EVENING EXCEPT FOR A FEW HIGH CLOUDS AND STRATUS OFFSHORE. THE 00Z
NKX SOUNDING WAS DRY IN THE LOW LEVELS WITH INCREASING WNW WINDS
ALOFT. ONSHORE GRADIENTS WITH ABOUT 5 MB SAN-IPL.

THE MARINE LAYER WILL REDEVELOP AND DEEPEN RAPIDLY OVERNIGHT WITH
LOW CLOUDS AND FOG GETTING INTO THE INLAND VALLEYS BY MORNING. THERE
COULD BE LOCAL DENSE FOG NEAR THE INLAND EXTENT OF THE STRATUS.
COOLER TUESDAY WITH MORE HIGH CLOUDINESS AND PARTIAL AFTERNOON
CLEARING OF MARINE LAYER CLOUDS AND MORE HIGH CLOUDINESS. WINDY IN
THE MOUNTAINS AND DESERTS TUESDAY AFTERNOON AND EVENING. A COLD
UPPER LOW CURRENTLY IN THE GULF OF ALASKA WILL DIG S ALONG THE COAST
AND OVER SRN CA WEDNESDAY. LOW LEVEL MOISTURE WILL INCREASE AND
THERE WILL BE ENOUGH DYNAMIC LIFT AND UPSLOPE FLOW FOR MAINLY LIGHT
PRECIP. THE SNOW LEVEL WILL LOWER TO ABOUT 5000 FT DURING THE DAY
WEDNESDAY.

A SHORT WAVE AND ASSOCIATED JET MAX WILL MOVE OVER SRN CA LATE
WEDNESDAY AND EARLY THURSDAY. THIS WILL CAUSE THE BEST CHANCE OF
SIGNIFICANT PRECIP WITH THE SNOW LEVEL LOWERING TO NEAR 4000 FT...OR
POSSIBLY LOCALLY LOWER. THE COLD AIR ALOFT AND JET DYNAMICS WILL
CAUSE A CHANCE OF THUNDERSTORMS WITH POTENTIAL WATERSPOUTS AND
FUNNEL CLOUDS. SHOWERS WILL TAPER OFF AND END THURSDAY NIGHT.

RAINFALL TOTALS SHOULD RANGE FROM ABOUT A THIRD TO HALF AN INCH W OF
THE MOUNTAINS WITH UP TO AN INCH ON THE COASTAL MOUNTAIN SLOPES
BELOW THE SNOW LEVEL. THE HIGH DESERTS SHOULD GET ABOUT A THIRD OF
AN INCH AND THE LOWER DESERTS LESS THAN A QUARTER INCH. SNOW
ACCUMULATION AT THE HIGHER ELEVATIONS SHOULD RANGE FROM ABOUT 4 TO
8 INCHES. STRONG GUSTY ONSHORE WINDS WILL ACCOMPANY THIS SYSTEM
WEDNESDAY AND THURSDAY...ESPECIALLY IN THE MOUNTAINS AND DESERTS.
MUCH COLDER WITH MAX TEMPS ABOUT 10 TO 20 DEGREES BELOW SEASONAL
AVERAGES BY THURSDAY.

&&

.LONG TERM (FRIDAY-MONDAY)...WEAK UPPER LEVEL HIGH PRESSURE WILL
BRING WARMER WEATHER WITH VARIABLE CLOUDINESS INTO SUNDAY. ANOTHER
UPPER LOW APPROACHING FROM THE NW WILL BRING MORE CLOUDS AND COOLING
WITH A CHANCE OF SHOWERS LATE SUNDAY INTO MONDAY.

&&

.AVIATION...
300300Z...MARINE STRATUS WILL DEVELOP RAPIDLY OVERNIGHT AND DEEPEN
THROUGH TUE TO NEAR FL040. STRATUS SHOULD REACH KONT AND KRNM BY
MORNING AND REMAIN BROKEN IN SOME AREAS THROUGH THE DAY. CIGS
DEVELOPING BTWN 1K AND 2K FT MSL AFTER 05Z ARE EXPECTED TO RISE TO
AROUND 3K FT MSL BY MIDDAY ON TUE.

&&

.MARINE...
A STRONG COLD FRONT APPROACHING FROM THE NORTH WILL GENERATE GUSTY
ONSHORE FLOW AND A LARGE...STEEP...WESTERLY SWELL BY WED. SMALL
CRAFT ADVISORIES WILL LIKELY BE NEEDED DUE TO THE STRONG WINDS AND
HAZARDOUS SEAS THROUGH THU.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...

SPECIAL WEATHER STATEMENT. SEE LAXSPSSGX.

&&

PUBLIC...ATKIN
AVIATION/MARINE...JAD

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN DIEGO CA
400 PM PDT MON MAR 29 2010

CAZ042-043-048-050-055>058-060>062-301200-
ORANGE COUNTY COASTAL AREAS-SAN DIEGO COUNTY COASTAL AREAS-
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
SAN DIEGO COUNTY VALLEYS-SAN BERNARDINO COUNTY MOUNTAINS-
RIVERSIDE COUNTY MOUNTAINS-SANTA ANA MOUNTAINS AND FOOTHILLS-
SAN DIEGO COUNTY MOUNTAINS-APPLE AND LUCERNE VALLEYS-
COACHELLA VALLEY-SAN DIEGO COUNTY DESERTS-
400 PM PDT MON MAR 29 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EXTREME
SOUTHWESTERN CALIFORNIA.

.DAY ONE...REMAINDER OF TODAY AND TONIGHT

PATCHY DENSE FOG IN THE INLAND VALLEYS WITH LOCAL VISIBILITY LESS
THAN ONE QUARTER MILE AT TIMES LATE TONIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH MONDAY

LOCAL STRONG AND DANGEROUS RIP CURRENTS AT THE BEACHES.

PATCHY DENSE FOG IN THE INLAND VALLEYS WITH LOCAL VISIBILITY LESS
THAN ONE QUARTER MILE AT TIMES TUESDAY MORNING.

A PACIFIC STORM WILL BRING STRONG WINDS TUESDAY AFTERNOON THROUGH
THURSDAY...ESPECIALLY IN THE MOUNTAINS AND DESERTS. RAIN AND
MOUNTAIN SNOW WEDNESDAY AND THURSDAY WITH A CHANCE OF THUNDERSTORMS
WEDNESDAY NIGHT AND THURSDAY.

.SPOTTER INFORMATION STATEMENT...SKYWARN SPOTTER ACTIVATION IS NOT
REQUESTED FOR THIS AREA...HOWEVER WEATHER SPOTTERS ARE ENCOURAGED TO
REPORT SIGNIFICANT WEATHER CONDITIONS.

ATKIN