Area Forecast Discussion
Issued by NWS Eureka, CA

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000
FXUS66 KEKA 122231
AFDEKA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
331 PM PDT SAT JUL 12 2014

.SYNOPSIS...A WEAK DISTURBANCE MOVING NORTHWEST OF THE AREA ON SUNDAY
WILL BRING A SLIGHT CHANCE OF THUNDERSTORMS TO NORTHERN TRINITY
COUNTY. COASTAL AREAS OF NORTHWEST CALIFORNIA WILL CONTINUE TO SEE
NIGHT AND MORNING CLOUDS AND FOG WITH SOME AFTERNOON CLEARING
THROUGH THE WEEKEND.

&&

.DISCUSSION...DRY AIR ALOFT HAS MOVED ACROSS THE AREA WITH LESS
FAVORABLE INSTABILITY. SOME CU ARE FORMING OVER SISKIYOU COUNTY
THIS AFTERNOON. EXPECT MORE DEVELOPMENT OVER THE TRINITY HORN AND
EXTREME E DEL NORTE COUNTY LATER IN THE AFTERNOON. ONE OR TWO
SHOWERS OR PERHAPS A STORM ARE POSSIBLE IN THESE AREAS...BUT
COVERAGE WILL BE VERY LOW.

A SHORTWAVE WILL EJECT FROM THE BASE OF THE PERSISTENT E PAC TROF
TONIGHT AND SUN...PASSING NW AND N OF THE AREA. THIS MAY LEND ENUF
DYNAMIC SUPPORT TO PRODUCE ISOLATED SHOWERS AND STORMS OVER THE NW
PORTION OF THE AREA ON SUN AFTERNOON. THE NEXT BEST CHANCE OF
STORMS WILL OCCUR OVER THE E MOUNTAINS AROUND THE MIDDLE OF THE
COMING WEEK. HOWEVER...POPS DURING THIS TIME WILL REMAIN AT
ISOLATED LEVELS.

COASTAL LOW CLOUDS CONTINUE WITH BREAKS OVER PORTIONS OF THE LOST
COAST AND EXTREME S MENDO. THRU THE REST OF THE AFTERNOON...MORE
BREAKS WILL OCCUR ON THE E EDGE OF THE CLOUDINESS. SOME PATCHES OF
LIGHT DRIZZLE WILL MIX WITH THE FOG ONCE AGAIN TONIGHT ALONG THE
REDWOOD COAST. LOW CLOUDS AND PATCHY FOG WILL CONTINUE OVER THE
PACIFIC WATERS AND ADJACENT COASTAL AREAS THROUGH THE REST OF
WEEKEND AND EARLY NEXT WEEK. MORNINGS WILL START OUT MOSTLY
CLOUDY...ESPECIALLY OVER THE REDWOOD COAST. SKIES WILL GENERALLY
BECOME PARTLY CLOUDY DURING THE AFTERNOON HOURS EACH DAY. BETTER
CONDITIONS ARE EXPECTED ALONG THE COAST BY TUE AND WED OF THE
COMING WEEK.

TEMPERATURES WILL REMAIN MILD ALONG THE COAST. OVER THE INLAND
AREAS...TEMPERATURES WILL CONTINUE TO WARM WITH READINGS REACHING
OVER 100 DEGREES OVER PORTIONS OF THE INTERIOR ON MON AND TUE. SOME
OFFSHORE FLOW MAY ALLOW FOR WARMER TEMPERATURES ALONG THE REDWOOD
COAST EARLY NEXT WEEK. /SEC

&&

.AVIATION...21Z SATELLITE IMAGERY SHOWS STRATUS BRINGING MVFR/IFR TO
MOST OF THE COAST AND MOSTLY SUNNY SKIES ELSEWHERE. ALONG THE
COAST...EXPECT MVFR/IFR THIS EVENING AND OVERNIGHT AS THE STRATUS
OVERSPREADS THE COAST. INLAND...EXPECT MOSTLY VFR. IFR IS POSSIBLE
IN SOME OF THE INLAND VALLEYS LATE TONIGHT AS STRATUS/FOG DEVELOPS.

&&

.MARINE...THIS AFTERNOON THE NEAR SHORE BUOYS HAVE BEEN REPORTING
LIGHT WINDS WITH SEAS AROUND 3 FT. THIS IS DUE TO AN UPPER LEVEL LOW
OFFSHORE MAINTAINING A WEAK PRESSURE GRADIENT OVER OUR AREA.
CONDITIONS WILL BEGIN DETERIORATING ON SUNDAY AS THE PACIFIC HIGH
MOVES TOWARDS THE WEST COAST AND STRENGTHENS. AT THE SAME TIME A
THERMAL TROUGH WILL DEVELOP ACROSS INTERIOR CALIFORNIA. THE
INTERACTION BETWEEN THESE TWO WILL STRENGTHEN THE SURFACE PRESSURE
GRADIENT, CAUSING INCREASED WINDS AND BUILDING SEAS. ISSUED A SC.Y
FOR ZONE 470 AND EXPECT MORE SC.Y`S WITH THE NEXT FORECAST PACKAGE.
NEAR GALES ARE EXPECTED ACROSS THE OUTER WATERS ALONG WITH HAZARDOUS
SEAS, BUT IT`S STILL TOO EARLY TO ISSUE ANY WATCHES FOR THESE.
CONDITIONS WILL IMPROVE FROM SOUTH TO NORTH ON TUESDAY AS THE
STRONGEST PRESSURE GRADIENT SHIFTS FURTHER TO THE NORTHWEST.
HOWEVER, LARGE SWELL GENERATED FROM STRONG WINDS TO OUR NORTH WILL
CONTINUE TO PROPAGATE THROUGH THE OUTER WATERS.

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
NORTHWEST CALIFORNIA COASTAL WATERS...
     SMALL CRAFT ADVISORY FROM 9 AM SUN TO 3 AM TUE PZZ475.

&&

$$

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