819
FXUS66 KEKA 282156
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
256 PM PDT TUE APR 28 2026
SYNOPSIS
A SLIGHT CHANCE OF ISOLATED SHOWERS AND
POSSIBLE THUNDERSTORMS PERSIST FOR THE INTERIOR THIS AFTERNOON AND
EVENING. HIGH PRESSURE WILL BUILD INTO THE REGION FOR THE REMAINDER
OF THE WEEK, BRINGING WARMER AND DRIER CONDITIONS WITH POTENTIAL
FOR COASTAL STRATUS EACH NIGHT/MORNING.
DISCUSSION
AS A LOW PRESSURE SYSTEM CONTINUES AWAY FROM
NORTHWEST CALIFORNIA, THERE ARE STILL VERY SLIGHT CHANCES FOR
ISOLATED SHOWERS AND THUNDERSTORMS FOR THE INTERIOR (5 TO 10
PERCENT). THE TOP SECTOR OF THE LOW WILL BE PULLING MOISTURE WITH
AN EASTERLY FLOW AT THE MID TO LOWER LEVELS. THIS PERTURBATION
WILL BE SLIGHTLY ENHANCED BY BULK SHEAR WHICH COULD GIVE A BIT OF
SLANT, ENABLING SOME THUNDERSTORM DEVELOPMENT. CAPE VALUES ARE
MODEST AND MOST OF THE AREAS OF RISK ARE TRINITY COUNTY AS WELL AS
NE MENDOCINO AND NORTHERN LAKE COUNTIES NEAR THE MOUNTAINOUS
EASTERN FLANKS AND BORDERS.
A SHALLOW MARINE LAYER ALONG THE COAST IS ANTICIPATED EACH
NIGHT/EARLY MORNING THROUGH THE END OF THE WEEK; HOWEVER, LIGHT
OFFSHORE FLOW OVERNIGHT COULD HELP STAVE OFF EXTENSIVE STRATUS
DEVELOPMENT. ALSO, EACH AFTERNOON AT THE COAST COULD SEE SLIGHTLY
ELEVATED NORTHERLY GUSTS. OTHERWISE, A MOSTLY DRY SET UP IS
FORECAST FOR THE WEEKEND, ALTHOUGH THERE ARE DECENT SIGNALS FOR
CAPE (~500J/KG), SATURDAY AND SUNDAY. HIGH PRESSURE WILL CONTINUE
TO FILL IN FOR THE NEXT FEW DAYS BRINGING WARMER TEMPERATURES AND
LIKELY DRIVING UP THE CAPE VALUES DUE TO THE BUOYANCY OF THE AIR
PARCELS. A LACK OF MOISTURE AND CIN WILL KEEP A LID ON THINGS.
MODEL SOUNDINGS DO SHOW INVERTED V'S BUT WITHOUT SUPERCOOLED
DROPLETS OR HIGHER DEWPOINTS THERE WILL NOT BE ENOUGH MOISTURE TO
POSE ANY SUSTAINED OR HIGH CONFIDENCE THREATS. /EYS
AVIATION
BESIDES AFTERNOON CUMULUS OVER THE HIGHER TERRAIN, THE ONLY OTHER
CLOUD COVER IN NW CALIFORNIA IS FROM AROUND ACV TO THE LOWER EEL
RIVER VALLEY AT THIS TIME. THIS CLOUD COVER IS BRINGING MVFR
CEILINGS TO THIS SMALL REGION, OTHERWISE VFR IS PREVAILING ACROSS NW
CALIFORNIA. THE MAJORITY OF THESE COASTAL CLOUDS SHOULD DISSIPATE
THROUGH THE REMAINDER OF THE AFTERNOON BUT WE SHOULD SEE A
REDEVELOPMENT IN ABOUT THE SAME PLACE OVERNIGHT WITH CEILINGS
RETURNING AT ACV. WHETHER OVERNIGHT CLOUD COVER MAKES IT TO CEC IS A
GREATER UNCERTAINTY AS IT WILL DEPEND ON HOW STRONG THE PRESSURE
GRADIENT IS OVER THE COASTAL WATERS AND HOW THE NORTH WIND
STRENGTHENS. IT IS ALWAYS POSSIBLE SOME DECENTLY STRONG SOUTHERLY
RETURN FLOW HAPPENS RIGHT ALONG THE COAST BRINGING THE CLOUDS BACK
TO CEC FOR A FEW HOURS LATER TONIGHT INTO EARLY WEDNESDAY MORNING.
FARTHER INLAND THE AFTERNOON CUMULUS WILL DISSIPATE THROUGH THE
EVENING LEAVING EXCELLENT RADIATIONAL COOLING THROUGH THE OVERNIGHT
HOURS. THIS SHOULD ALLOW INTERIOR VALLEY FOG TO FORM ONCE AGAIN
WITHIN THE KLAMATH/TRINITY/EEL RIVER VALLEYS. THE CLOUDS WILL STAY
AWAY FROM UKI. /RPA
MARINE
NORTHERLY WINDS WILL CONTINUE TO RAMP-UP OVER THE COASTAL WATERS
THROUGH FRIDAY WITH NEAR GALE TO GALE FORCE CONDITIONS EXPECTED
BEGINNING AS EARLY AS THURSDAY. SMALL CRAFT ADVISORIES ARE NOW IN
EFFECT FOR THE STRENGTHENING WINDS AND STEEP SEAS. THE TWO INNER
WATER ZONES HAVE BEEN INCLUDED THROUGH TONIGHT AS STEEP SEAS
PROPAGATE INTO THE OUTER PORTIONS OF THOSE ZONES. A BRIEF PERIOD OF
LOWER SEAS IS POSSIBLE WEDNESDAY MORNING AND EARLY AFTERNOON SO THE
ADVISORIES END EARLY WEDNESDAY MORNING. HOWEVER, WINDS AND SEAS WILL
BUILD FURTHER BY WEDNESDAY AFTERNOON AND ADVISORIES WILL NEED TO
ONCE AGAIN BE ISSUED FOR THOSE AREAS STARTING AS EARLY AS MID
AFTERNOON ON WEDNESDAY. PERSISTENT WINDS OVER THE OUTER WATERS WILL
KEEP SEAS ELEVATED AND WINDS IN SMALL CRAFT CRITERIA TO NEAR GALE
WEDNESDAY INTO WEDNESDAY NIGHT. AS THE PRESSURE GRADIENT FURTHER
STRENGTHENS, GALE FORCE GUSTS WILL BECOME LIKELY THURSDAY AFTERNOON
THROUGH FRIDAY NIGHT IN THE OUTER ZONES. BECAUSE OF THIS, A GALE
WATCH HAS BEEN RAISED FOR BOTH OF THE OUTER WATER ZONES BEGINNING AS
EARLY AS THURSDAY MORNING SOUTH OF THE CAPE AND THURSDAY AFTERNOON
NORTH OF THE CAPE, RUNNING THROUGH VERY EARLY SATURDAY MORNING.
/RPA
EKA WATCHES/WARNINGS/ADVISORIES
CA...
NONE.
NORTHWEST CALIFORNIA COASTAL WATERS...
SMALL CRAFT ADVISORY UNTIL 5 AM PDT WEDNESDAY FOR PZZ450.
SMALL CRAFT ADVISORY UNTIL 6 AM PDT WEDNESDAY FOR PZZ455.
SMALL CRAFT ADVISORY UNTIL 3 PM PDT THURSDAY FOR PZZ470.
GALE WATCH FROM THURSDAY AFTERNOON THROUGH LATE FRIDAY
NIGHT FOR PZZ470.
SMALL CRAFT ADVISORY UNTIL 11 PM PDT WEDNESDAY FOR PZZ475.
GALE WATCH FROM WEDNESDAY EVENING THROUGH LATE FRIDAY NIGHT
FOR PZZ475.
NOTE: THE FULL FORECAST DISCUSSION IS NOW REGULARLY ISSUED BETWEEN
10 AM/PM AND 1 PM/AM. ADDITIONAL UPDATES WILL BE ISSUED AS NEEDED.
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