956
FXUS66 KEKA 062244
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
244 PM PST SAT DEC 6 2025
SYNOPSIS
STRATUS/LOW CLOUDS, FOG AND/OR MIST ARE EXPECTED TO
REDEVELOP THIS EVENING INTO SUNDAY. A WARM FRONT WILL BRING LIGHT
RAIN AND DRIZZLE ON SUNDAY, ESPECIALLY FOR DEL NORTE AND HUMBOLDT
COUNTIES. GENERALLY DRY WEATHER CONDITIONS IS EXPECTED TO PREVAIL
ACROSS MUCH NORTHWEST CALIFORNIA NEXT WEEK, WITH INTERMITTENT
LIGHT RAIN/DRIZZLE FOR DEL NORTE AND PORTIONS OF HUMBOLDT
COUNTIES.
DISCUSSION
LOW CLOUDS HAVE LIFTED AND SCATTERED OUT THIS
AFTERNOON, ALLOWING FOR SUNNY TO PARTLY CLOUDY SKIES ACROSS MUCH
OF NORTHWEST CALIFORNIA. THE MAIN EXCEPTION REMAINS THE COASTAL
AREAS IN HUMBOLDT AND MENDOCINO COUNTIES, WHERE VARIABLE
CONDITIONS WITH LOW CLOUDS AND REDUCED VISIBILITY IN MIST
PREVAIL. FOR THE REST OF THE DAY, A PERIOD OF DENSE FOG IS
EXPECTED TO DEVELOP AGAIN LATE THIS AFTERNOON/EVENING, ESPECIALLY
AROUND HUMBOLDT BAY AND ALONG PORTIONS OF HWY 101 FROM FORTUNA TO
MCKINLEYVILLE. IN THE CASE OF DENSE FOG, DRIVE WITH CAUTION, USE
LOW BEAMS, AND ALLOW EXTRA TIME TO REACH YOUR DESTINATION.
TONIGHT INTO SUNDAY, AREAS OF VALLEY FOG ARE EXPECTED TO DEVELOP
AGAIN. OVERNIGHT TEMPERATURES ARE EXPECTED TO BE NEAR TO ABOVE
AVERAGE TEMPERATURES WITH LOWS GENERALLY IN THE 40S IN THE
VALLEYS AND UPPER 40S TO LOW 50S IN THE RIDGES.
ON SUNDAY, A WARM FRONT WILL BRING LIGHT RAIN AND/OR DRIZZLE
ACROSS THE NORTHERN PORTION OF THE AREA, ESPECIALLY FOR DEL NORTE
AND HUMBOLDT COUNTIES. WITH WESTERLY FLOW ALOFT, PRECIPITATION IS
EXPECTED TO BE ALONG THE COASTAL RANGE IN DEL NORTE AND HUMBOLDT
COUNTIES. ELSEWHERE, DRY WEATHER CONDITIONS WILL PREVAIL WITH
MORNING VALLEY FOG, MIST AND LOW CLOUDS.
HIGH PRESSURE SLOWLY BUILD BACK TO THE REGION NEXT WEEK. THE
GENERAL CONSENSUS BETWEEN THE ENSEMBLE AND OPERATIONAL MODELS IS
KEEP DRY WEATHER CONDITIONS ACROSS MUCH OF NORTHWEST CALIFORNIA,
WITH INTERMITTENT LIGHT RAIN/DRIZZLE IN DEL NORTE COUNTY THROUGH
AT LEAST THURSDAY. IN ADDITION, A GRADUAL WARMING TREND IS
EXPECTED THROUGH THE WEEK, WITH INTERIOR HIGH TEMPERATURES WARMING
UP TO MID 60S TO MID 70S LATE IN THE WEEK. ECMWF EXTREME FORECAST
INDEX (EFI) HIGHLIGHT ABOVE SEASONAL AVERAGE TEMPERATURES FOR
HIGH AND LOW INTERIOR TEMPERATURES BY MID WEEK INTO NEXT WEEKEND.
SOME ENSEMBLES ARE INDICATING A PATTERN CHANGE BY MID DECEMBER
BUT THERE IS A LARGE AMOUNT OF UNCERTAINTY AS IT IS TOO FAR OUT IN
TIME. -ZVS
AVIATION...(18Z TAFS)
IFR TO LIFR CEILINGS AND VISIBILITIES HAVE
FINALLY IMPROVED TO MVFR TO VFR CONDITIONS ACROSS THE AREA AS
STRATUS LIFTS AND SCATTERS. LIFR TO IFR STRATUS IS LIKELY TO RETURN
AGAIN THIS EVENING AND OVERNIGHT TO THE COASTAL AREAS AHEAD OF AN
APPROACHING FRONT. LIGHT RAIN IS POSSIBLE OVER HUMBOLDT AND DEL
NORTE STARTING EARLY SUNDAY MORNING AROUND 12Z. SOME INTERIOR
VALLEYS MAY SEE STRATUS AND FOG AGAIN TONIGHT, BUT CONFIDENCE AT UKI
IS LOWER (AROUND A 30% CHANCE). JB
MARINE
NORTHERLY WINDS AND SEAS HAVE EASED AS FRONT MOVES IN
NORTH OF OUR AREA. GENERALLY LIGHT WINDS ARE FORECAST THIS
WEEKEND, WITH SOUTH WINDS FORECAST NORTH OF CAPE MENDOCINO AND
WEST-NORTHWEST WINDS FORECAST SOUTH OF THE CAPE. DESPITE LIGHT
WINDS, SEAS WILL BUILD AGAIN TODAY AS A MID-PERIOD NORTHWEST SWELL
FILLS IN. THIS WILL PEAK AT AROUND 7-9 FT AT 12 SECONDS. WAVE
HEIGHTS PEAK TONIGHT AND EARLY SUNDAY MORNING. COMBINED SEAS COULD
BRIEFLY REACH OR EXCEED 10 FT, ESPECIALLY IF THE SWELL FILLS IN
HIGHER THAN FORECAST. SEAS SUBSIDE SUNDAY AND MONDAY AS THIS SWELL
DECAYS. LIGHT WINDS CONTINUE INTO EARLY NEXT WEEK, BUT SEAS WILL
REMAIN ELEVATED AS A SERIES OF MID-PERIOD NORTHWEST SWELLS FILL IN
FROM SYSTEMS TO THE NORTH. JB
EKA WATCHES/WARNINGS/ADVISORIES
CA...
COASTAL FLOOD ADVISORY UNTIL 1 PM PST THIS AFTERNOON FOR
CAZ103.
NORTHWEST CALIFORNIA COASTAL WATERS...
COASTAL FLOOD ADVISORY UNTIL 1 PM PST THIS AFTERNOON FOR
PZZ415.
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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