152
FXUS66 KEKA 070826
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
1226 AM PST SUN DEC 7 2025
SYNOPSIS
CLOUDY AND MISTY CONDITIONS EXPECTED THIS MORNING. A
WARM FRONT WITH LIGHT RAIN AND DRIZZLE PASSES OVER DEL NORTE AND
HUMBOLDT COUNTIES TODAY. GENERALLY DRY WEATHER CONDITIONS IS
EXPECTED TO PREVAIL ACROSS NW CA THIS COMING WEEK, WITH PERIODS OF
LIGHT RAIN/DRIZZLE FOR THE NORTH COAST.
DISCUSSION
A STUBBORN HIGH PRESSURE CENTER HAS BEEN SITTING OFF
THE CALIFORNIA COAST FOR A FEW WEEKS NOW. THE STRENGTH OF THE HIGH
PRESSURE HAS BEEN KEEPING THE STORM TRACK FAR TO THE NORTH OF NW CA
FOR THE LAST FEW WEEKS. THIS SLOWER START TO WINTER WILL CONTINUE
THIS WEEK WITH INCREASED MOISTURE, YET NOT ENOUGH FORCING WILL BE
PRESENT TO CREATE MEANINGFUL PRECIPITATION AMOUNTS AS MOST OF THE
VERTICAL VORTICITY OF A FRONTAL SYSTEM TO THE NORTH WILL BE
FOCUSED IN OREGON, ONLY BRIEFLY AND PERIODICALLY CLIPPING NW CA.
THE INCREASED ATMOSPHERIC MOISTURE WILL CREATE FOG AND LOW CLOUDS
ALONG THE COAST AND IN THE INLAND VALLEYS. INCREASED CLOUD
COVERAGE WILL KEEP NIGHTTIME TEMPERATURES ON THE WARMER SIDE FOR
THE SEASON.
A PASSING WARM FRONT WILL BRING LIGHT RAIN AND/OR DRIZZLE ACROSS
MOSTLY DEL NORTE AND HUMBOLDT COUNTIES LATER TODAY. TOTAL STORM
PRECIPITATION AMOUNTS WILL BE MINIMAL AND MOSTLY NORTH OF HUMBOLDT
BAY AND WEST OF THE KLAMATH RIVER. REFS PROBABILITIES SHOWS ONLY A
20-30% CHANCE OF WETTING RAIN IN DEL NORTE AND A 0-15% CHANCE OF
WETTING RAIN IN NORTHERN HUMBOLDT CO. ELSEWHERE, DRIER WEATHER
CONDITIONS WILL PREVAIL WITH MORNING VALLEY FOG, MIST AND LOW
CLOUDS.
HIGH PRESSURE SLOWLY BUILDS BACK OVER THE AREA NEXT WEEK IN THE WAKE
OF THE FRONTAL PASSAGES. THE GENERAL CONSENSUS BETWEEN THE ENSEMBLE
AND OPERATIONAL MODELS IS DRY WEATHER CONDITIONS ACROSS MUCH OF
NORTHWEST CALIFORNIA, WITH INTERMITTENT LIGHT RAIN/DRIZZLE IN DEL
NORTE COUNTY THROUGH THURSDAY AT THE EARLIEST. THE DRY WEATHER
ALLOWS FOR A GRADUAL WARMING TREND THROUGH THE WEEK, WITH INTERIOR
HIGH TEMPERATURES WARMING UP TO MID 60S TO MID 70S LATE IN THE WEEK
PEAKING ON THURSDAY.
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
TO HAVE ANY TRUE MEANING FOR THE FORECASTS.
-ZVS/DES
AVIATION...(06Z TAFS)
PERIODS OF LIFR TO IFR STRATUS WILL
CONTINUE INTO EARLY SUNDAY FOR 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. 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. A MID PERIOD NORTHWEST SWELL WILL
CONTINUE AND PEAK AT AROUND 7-9 FT AT 12 SECONDS. WAVE HEIGHTS PEAK
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...
NONE.
NORTHWEST CALIFORNIA COASTAL WATERS...
NONE.
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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