Hazardous Seas Warning 19, NWS Eureka, CA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
420 AM PDT THU JUN 18 2009

.SYNOPSIS...HIGH PRESSURE OVER THE NORTHEAST PACIFIC WILL CONTINUE
TO BRING DRY AND STABLE WEATHER TO NORTHWEST CALIFORNIA TODAY.  AN
UPPER LEVEL DISTURBANCE WILL MOVE ACROSS THE REGION FRIDAY RESULTING
IN ISOLATED AFTERNOON SHOWERS AND THUNDERSTORMS...PRIMARILY
OVER THE TRINITY COUNTY MOUNTAINS.
&&

.DISCUSSION...HIGH PRESSURE WILL CONTINUE TO DOMINATE THE WX ACROSS
NW CA TODAY. SAT IMAGERY AND SFC OBS SHOW PATCHY FG/DZ AND LOW
CLOUDS ALONG THE COAST EARLY THIS MORNING WITH CLEAR SKIES
PREVAILING ELSEWHERE. ABUNDANT INSOLATION WILL ALLOW MAX TEMPS TO
PEAK IN THE LOW TO MID 90S ACROSS THE INTERIOR. LOW CLOUDS WILL
DISSIPATE AGAIN BY LATE MORNING ALLOWING TEMPS ALONG THE COAST TO
CLIMB TO THE MID TO UPPER 60S. THE RIDGE WILL WEAKEN FRI AS A SHORT
WAVE TROUGH MOVES ACROSS THE REGION. MODELS CONTINUE TO SHOW DECENT
INSTABILITY BY THE AFTERNOON WITH THE GFS AND NAM12 FCSTING LIS OF
-1C TO -3C AND SREF PROB OF -LI AROUND 90 PERCENT. THEREFORE
CONTINUED MENTION OF ISOLD TSTMS OVER TRINITY COUNTY AND NE
MENDOCINO COUNTY FRI AFTERNOON/EVENING. ANOTHER SHORT WAVE WILL PASS
ACROSS THE REGION SAT...BUT MODELS CONTINUE TO SHOW SOME MID LEVEL
WARMING RESULTING IN A LESS FAVORABLE ENVIRONMENT FOR TSTM
DEVELOPMENT...BUT WILL LEAVE MENTION OF ISOLD SHRAS OVER THE HORN OF
TRINITY COUNTY. HIGH PRESSURE WILL RETURN TO THE REGION BY SUN AND
KEEP NW CA DRY AND STABLE THROUGH THE FCST WITH SEASONAL FG/STRATUS
ALONG THE COAST. SLOWLY INCREASING HEIGHTS ACROSS THE REGION WILL
RESULT IN A GRADUAL WARMING TREND THROUGH THE PERIOD. BC
&&

.AVIATION...SATELLITE IMAGERY SHOWS MARINE STRATUS ALONG THE DEL
NORTE AND HUMBOLDT COUNTY COASTS EARLY THIS MORNING...WITH SEVERAL
COASTAL OBSERVATIONS STATIONS REPORTING LIGHT PRECIPITATION. SOME
CLEARING IS EXPECTED THIS AFTERNOON AS GUSTY NORTHWEST WINDS
REDEVELOP. IFR CEILINGS WILL LIKELY RETURN TO THE COAST LATER THIS
EVENING. MAINLY VFR CONDITIONS EXPECTED INLAND EXCEPT FOR IFR
CEILINGS/VISIBILITIES IN THE RIVER VALLEYS EARLY THIS
MORNING...ESPECIALLY UP THE EEL TO AROUND GARBERVILLE. TH
&&

.MARINE...MODERATE NORTH WINDS WILL CONTINUE TODAY WITH SMALL CRAFT
WINDS CONTINUING ACROSS THE SOUTHERN WATERS TODAY. THE WINDS SHOULD
EASE A BIT OVERNIGHT AND THEN RAMP UP AGAIN LATE FRIDAY MORNING WITH
GALES POSSIBLE ACROSS THE SOUTHERN WATERS BY FRI AFTERNOON. THE
EXTENT AND DURATION OF THESE GALES ARE STILL QUESTIONABLE...AND LEFT
THE WATCH AS IS. MODERATE TO STRONG NORTH WINDS WITH MARGINAL GALES
WILL CONTINUE INTO NEXT WEEK. LARGE WIND WAVES AND SHORT PERIOD
FRESH SWELL WILL DEVELOP IN RESPONSE TO THE PERSISTENT NORTH
WINDS...AND HAVE ISSUED A HAZARDOUS SEAS WATCH FOR THE SOUTHERN
WATERS. TH
&&

.EKA WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY FROM CAPE MENDOCINO TO PT ARENA OUT 60 NM UNTIL
FRIDAY.
GALE AND HAZARDOUS SEAS WATCH FOR CAPE MENDOCINO TO PT ARENA OUT 60
NM FROM FRIDAY AFTERNOON THROUGH MONDAY EVENING.
&&

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