Area Forecast Discussion
Issued by NWS Eureka, CA

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000
FXUS66 KEKA 022202
AFDEKA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
302 PM PDT THU JUL 2 2015

.SYNOPSIS...MONSOONAL MOISTURE WILL PRODUCE A CHANCE OF
THUNDERSTORMS TO THE MOUNTAINS BEGINNING THIS AFTERNOON AND
PERSISTING THROUGH THIS WEEKEND.


&&

.DISCUSSION...AN UPPER LEVEL RIDGE WILL SLOWLY WEAKEN FRIDAY AND
THIS WEEKEND. AFTERNOON TEMPERATURES WILL GRADUALLY DIMINISH BELOW
100 OVER THE INTERIOR. TEMPERATURES WILL CONTINUE TO AVERAGE ABOUT
5 DEGREES ABOVE NORMAL DURING THE DAY THROUGH EARLY NEXT WEEK. A
HEAT ADVISORY CONTINUES THROUGH THIS EVENING FOR THE UPPER TRINITY
RIVER AND NORTH COAST INTERIOR ZONES. HEAT WILL BE MOST PREVALENT
IN TRINITY COUNTY CLOSER TO THE WEAKENING RIDGE. MONSOONAL
MOISTURE IS SPREADING INTO THE AREA FROM THE SOUTH AND SOUTH EAST
INCREASING THE CLOUD COVER AND THE CHANCES FOR ISOLATED SHOWERS
AND THUNDERSTORMS THE NEXT FEW AFTERNOONS. THE GFS DEVELOPS MORE
QPF JUST OFF OUR COAST BY FRIDAY PRODUCING A SLIGHT CHANCE FOR
SHOWERS. LOW CLOUDS AND PATCHY NIGHT TIME AND EARLY MORNING FOG
WILL AFFECT COASTAL AREAS. DRIZZLE IS POSSIBLE TONIGHT ALONG THE
REDWOOD COAST PER LOW LEVEL OMEGA AND SURFACE MOISTURE FLUX
CONVERGENCE PROGS.

&&

.AVIATION...EXTENSIVE STRATUS ONCE AGAIN COVERS THE NORTHWEST
CALIFORNIA COAST TODAY WITH MID AND UPPER LEVEL CLOUDS BEGINNING TO
STREAM OVER THE SOUTHERN HALF OF THE FORECAST AREA. LITTLE CHANGES
ARE ANTICIPATED WITH THE UPPER RIDGE AXIS POSITIONED ACROSS NORTHERN
CALIFORNIA SO A PERSISTENCE FORECAST SHOULD SUFFICE FOR COASTAL
AREAS. EXPECT BRIEF SCATTERING CLOUDS LATE THIS AFTERNOON WITH IFR
AND LIFR CEILINGS AND VISIBILITIES TO RETURN TONIGHT. THE TROUGH OFF
OF THE CALIFORNIA COAST WILL FEED MOISTURE ACROSS NORTHERN
CALIFORNIA THROUGH THE TAF PERIOD. THIS COULD PRODUCE SOME WEAK
SHOWERS BUT OTHERWISE EXPECT VFR CLOUD COVER INLAND. /KML


&&

.MARINE...LIGHT TO FRESH WINDS WILL CONTINUE THROUGH FRIDAY AS THE
PERSISTING RIDGE OFFSHORE AND THERMAL TROUGH INLAND MAINTAIN A
TIGHTENED PRESSURE GRADIENT ACROSS THE COASTAL WATERS. THIS WEEKEND
A SURFACE LOW WILL TRAVEL UP THE COAST AND BUST UP THE GRADIENT
WHICH WILL ALLOW THE WINDS TO EASE. SOUTHERLY FLOW WILL DEVELOP BY
SUNDAY AND PERSIST THROUGH EARLY NEXT WEEK. THIS WILL CREATE
SOUTHERLY WIND CHOP. THE WAVE ENVIRONMENT SHOULD OTHERWISE BE
DOMINATED BY SHORTER PERIOD NORTHERLY WAVES OVER THE NEXT FEW DAYS.
MEANWHILE A PERSISTING SOUTH SWELL WILL CONTINUE TO PROPAGATE THE
COASTAL WATERS THROUGH THE FORECAST PERIOD. A LATE MORNING ASCAT
PASS CONFIRMED FRESH NORTHERLY WINDS OFFSHORE WITH SOUTHERLY FLOW
ALONG THE IMMEDIATE COAST. NEAR SHORE BUOY OBSERVATIONS INDICATE
A PRESENCE OF SMALL CRAFT WAVES ESPECIALLY ACROSS THE NORTHERN
OUTER WATERS. AS A RESULT, THE SMALL CRAFT ADVISORY CONTINUES. THE
ADVISORY ACROSS THE SOUTHER OUTER WATERS, HOWEVER, WAS ALLOWED TO
EXPIRE THIS AFTERNOON DUE TO CONDITIONS BEING LOWER. /KML


&&

.FIRE WEATHER...VERY HOT CONDITIONS WILL CONTINUE ACROSS THE
INTERIOR VALLEYS THROUGH TODAY. MONSOONAL MOISTURE WILL PRODUCE A
CHANCE OF THUNDERSTORMS TO THE MOUNTAINS EACH AFTERNOON THROUGH
THIS WEEKEND ALONG WITH INCREASING CLOUD COVER AND SLIGHTLY COOLER
TEMPERATURES. A FIRE WX WATCH MAY BE REQUIRED FRIDAY AFTERNOON
FOR THE TRINITY FIRE WX ZONE. WINDS WILL BE GENERALLY LIGHT AND
TERRAIN DRIVEN.


&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
     HEAT ADVISORY UNTIL 1 AM PDT FRIDAY FOR CAZ003-004.

NORTHWEST CALIFORNIA COASTAL WATERS...
     SMALL CRAFT ADVISORY UNTIL 5 AM PDT SATURDAY FOR PZZ470.

&&

$$

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