Hazardous Seas Warning 52, NWS Eureka, CA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
215 PM PDT TUE MAR 16 2010

.SYNOPSIS...A WEAK COLD FRONT WILL MOVE ACROSS NORTHWEST
CALIFORNIA EARLY THIS EVENING...WITH DRIZZLE OR LIGHT SHOWERS
ALONG THE COAST COMING TO AN END. HIGH PRESSURE WILL BUILD OVER
THE AREA FOR THE REMAINDER OF THE WEEK...YIELDING DRY AND WARMER
WEATHER.

&&

.DISCUSSION...A WEAK COLD FRONT BISECTED NORTHWEST CALIFORNIA AT
EARLY AFTERNOON...AND WILL CONTINUE ITS PUSH SOUTHEAST AND WEAKEN
OVERNIGHT. HIGH PRESSURE IS ALREADY BUILDING IN BEHIND THIS
FEATURE...WITH CLEARING SKIES FOR MOST AREAS DURING THE NIGHT.
HOWEVER...SOME STRATOCU MAY LINGER GIVEN THE UPSLOPE FLOW ALONG THE
NORTHERN SLOPES OF CAPE MENDOCINO AND INTO THE LOWER EEL RIVER
VALLEY. THIS STRATUS MAY CREEP INTO THE EUREKA-ARCATA-MCKINLEYVILLE
AREAS AS WELL. ADDITIONALLY...SOME FOG IS PROBABLE IN THE VALLEYS OF
TRINITY...DEL NORTE AND HUMBOLDT COUNTIES OVERNIGHT.

PLEASANT AND GENERALLY SUNNY WEATHER IS EXPECTED FOR THE NEXT COUPLE
OF DAYS...AS HIGH PRESSURE ALOFT COMBINES WITH DIURNAL OFFSHORE FLOW
TO YIELD AFTERNOON HIGHS 10 TO 15 DEGF ABOVE NORMAL FOR MOST INLAND
AREAS. EVEN COASTAL SECTIONS SHOULD WARM INTO THE LOWER 60S...OR
ABOUT 5 DEGREES ABOVE SEASONAL NORMS. HOWEVER...BREZZY CONDITIONS
ALONG THE COAST WILL DEFINITELY MAKE IT FEEL COOLER. A WEAK UPPER
LEVEL SYSTEM SHOULD PASS HARMLESSLY BY WED NIGHT...BUT WILL HELP
REINFORCE THE WINDS INTO THU. WITH WARMING AIR ALOFT AND WEAKENING
WINDS GOING INTO FRI...MARINE STRATUS WILL PROBABLY BEGIN TO FORM
FIRST ACROSS THE SOUTHERN WATERS AND THEN GRADUALLY PUSH NORTH OF
CAPE MENDOCINO FRI NIGHT INTO SAT...SO AN INCREASE IN LOW CLOUDS
ALONG THE COAST LOOKS PROBABLE AT THAT TIME. MEDIUM RANGE MODELS
AND THEIR ENSEMBLES KEEP THE UPPER LEVEL RIDGE ACROSS THE WEST
COAST THROUGH AT LEAST SAT NIGHT AND QUITE POSSIBLY A LITTLE
LONGER...SO HAVE DOWNSCALED PRECIP CHANCES IN THAT TIME PERIOD.
THE RIDGE IS EXPECTED TO GRADUALLY FLATTEN EARLY NEXT WEEK SO HAVE
MAINTAINED SLIGHT CHANCE...BUT BELOW CLIMATOLOGY...POPS. BURGER

&&

.AVIATION...A WEAK FRONT CONTINUES TO SLOWLY MOVE ACROSS THE COAST
AND WITH LITTLE WIND...DRIZZLE LOW CLOUDS AND PATCHY FOG HAVE BEEN
PRESENT AND SHOULD CONTINUE FOR AT LEAST A FEW HOURS. VFR
CONDITIONS FOR BOTH COASTAL AND INTERIOR AIR SITES CAN BE EXPECTED
ALONG WITH LIGHT WINDS LATER TONIGHT...BEGINNING A STRETCH OF
MAINLY CLEAR SKIES FOR THE NEXT FEW DAYS. JTON

&&

.MARINE...LARGE WEST SWELL AROUND 13 FT WILL PEAK TONIGHT AROUND 16
TO 17 FEET AND THEN SLOWLY SUBSIDE WEDNESDAY...THEN TRANSITION INTO
A SHORT PERIOD NORTH FRESH SWELL LATE WED INTO THUR. AT THIS
TIME...HAVE OPTED TO REFRAIN FROM ISSUING A HSA AS IT APPEARS THE
COASTLINE WILL REMAIN BELOW CRITERIA. A SURFACE RIDGE OF HIGH PRESSURE
WILL BUILD RAPIDLY OVER THE NE PAC WHILE A THERMAL TROUGH DEVELOPS
OVER THE INTERIOR. THIS WILL LEAD TO OUR FIRST GOOD SPRING NORTH WIND
EVENT AND GALE WARNINGS OVER THE OUTER WATERS. JTON

&&

.EKA WATCHES/WARNINGS/ADVISORIES...

SMALL CRAFT ADVISORY UNTIL 3 AM PDT FRIDAY PZZ450-455.

SMALL CRAFT ADVISORY UNTIL 1 PM PDT WEDNESDAY PZZ470-475.

GALE WARNING FROM 1 PM WEDNESDAY TO 11 PM PDT THURSDAY
PZZ470-475.

HAZARDOUS SEAS WARNING FROM 1 PM WEDNESDAY TO 11 PM PDT THURSDAY
PZZ470-475.

&&

VISIT US AT HTTP://WWW.WEATHER.GOV/EUREKA

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