477
FXUS66 KEKA 092140
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
240 PM PDT MON MAR 9 2026
SYNOPSIS
GUSTY NORTHERLY WINDS CONTINUE THROUGH THE EVENING,
EASING A BIT BY TUESDAY. COLD TEMPERATURES ARE LIKELY AFTER THE
WINDS BACK OFF OVERNIGHT, TUESDAY AND WEDNESDAY MORNING.
DISCUSSION
AS HIGH PRESSURE FILLS IN BEHIND THE PASSING COLD
FRONT, GUSTY WINDS OUT OF THE NORTH HAVE RAMPED UP IN ITS WAKE.
THIS IS DUE TO A WELL MIXED BOUNDARY LAYER, PROMOTING EFFICIENT
DOWNWARD MOMENTUM TRANSFER AND GUSTY SURFACE WINDS ALONG THE
COAST. ALSO, A CUTOFF LOW TO THE SOUTH TIGHTENS THE PRESSURE
GRADIENT AGAINST THE BUILDING RIDGE. GUSTS GREATER THAN 30MPH
HAVE BEEN RECORDED AT THE CRESCENT CITY AIRPORT AND COOSKIE
MOUNTAIN AS WELL AS COASTAL HEADLANDS AND THE USUAL AREAS EXPOSED
ON THE COAST AND AT ELEVATION. WINDS WILL EASE SOME TUESDAY, BUT
WILL REMAIN BREEZY THROUGH TUESDAY AFTERNOON WHILE REMAINING
ELEVATED OVER THE NEAR AND FAR COASTAL WATERS. HIGHLIGHTED HAZARDS
FOR AREA WATERS ARE COVERED IN THE MARINE SECTION BELOW.
CHILLY, AND POTENTIALLY FROSTY, MORNING CONDITIONS COULD OCCUR IN
THE WAKE OF THE PASSING FRONT TUESDAY AND WEDNESDAY MORNINGS.
HOWEVER, ON TUESDAY MORNING, LINGERING ELEVATED WINDS ALONG WITH
GENERALLY OVERCAST SKIES COULD RESULT IN MORNING TEMPERATURES
ABOVE 36 RESULTING IN NO FROST DEVELOPMENT. FOR BOTH MORNINGS,
NBM INDICATES THAT COASTAL LOCATIONS FROM ABOUT ALBION IN
MENDOCINO COUNTY TO THE OREGON BORDER HAVE ABOUT A 60 TO 80
PERCENT CHANCE OF LOWS BELOW 40 DEGREES (THIS INCLUDES AREAS
AROUND HUMBOLDT BAY AND CRESCENT CITY). THERE IS ALSO ABOUT A 50
TO 70 PERCENT CHANCE FOR MORNING LOW TEMPERATURES 36 DEGREES OR
LESS FOR SOME REGIONS OF INTERIOR DEL NORTE, INTERIOR HUMBOLDT,
TRINITY, AND NE MENDOCINO COUNTIES. THE GROWING SEASON HAS BEGUN
FOR MENDOCINO, LAKE, COASTAL DEL NORTE, AND THE NORTHERN HUMBOLDT
COAST, SO A FROST PRODUCT COULD BE APPLICABLE FOR JUST NE
MENDOCINO (INCLUDING LEGGET, LAYTONVILLE, WILLITS, POTTER VALLEY,
AND COVELO) FOR ONE OR BOTH MORNINGS.
A STRONG PACIFIC RIDGE WILL GENERALLY REMAIN IN CONTROL AS
ADDITIONAL WEAK FRONTS ATTEMPT TO BRIEFLY FLATTEN IT, INTRODUCING
MORE VERY SLIM CHANCES FOR LIGHT SHOWERS, MAINLY IN DEL NORTE
COUNTY. CHANCES FOR A WETTING RAINFALL (0.1 INCH OR HIGHER) ONLY
REACH 25% TO 35% LATE THIS WEEK AND INCREASE SOME THIS COMING
WEEKEND. THERE WILL BE PERIODS OF REBOUNDING HIGH TEMPERATURES
BETWEEN THE FRONTS. /JLW & JJW & EYS
AVIATION
MVFR CONDITIONS PERSIST THIS MORNING WITH GUSTY
NORTHERLIES ALONG THE COAST. VFR IS FORECASTED AROUND 20Z (+/- 1HR)
WITH >80% CONFIDENCE. STRONG WINDS TO CONTINUE THROUGH THE DAYLIGHT
AND EVENING HOURS. EXPECTED LLT AS HIGH-RESOLUTION MODELS SUGGEST A
SPEED MAXIMUM OF 30-40KTS AT AROUND 2500 FT AGL, ESPECIALLY CLOSER
TO AND SOUTH OF CAPE MENDOCINO. HREF AND NAM MODELS SHOW A RETURN OF
SCT-BKN CEILINGS THIS EVENING FROM 03Z-09Z. STRONG WINDS COULD
CREATE HAZY CONDITIONS AT TERMINALS NEAR OCEAN SHORE BREAK DOWN TO
4SM THIS AFTERNOON. INLAND TERMINALS CAN EXPECT VALLEY FOG CLEARING
THROUGH THE DAY WITH AFTERNOON GUSTY WINDS MIXING DOWN TO TERMINALS.
WAVE CLOUDS HAVE BEEN SPOTTED ON VISUAL SATELLITE, INCREASING THE
CONFIDENCE IN LLT NEAR TERRAIN, ESPECIALLY BY THE KING RANGE.
MARINE
NORTHERLY WINDS ARE STRENGTHENING IN ALL WATERS TODAY
DUE TO A DRY COLD FRONT THAT PASSED OVER THE AREA YESTERDAY.
NORTHERLY WINDS WILL BE VERY STRONG AS A SHARP PRESSURE GRADIENT
EXISTS BETWEEN UKIAH CA (1013MB) AND COOS BAY OR (1023MB). SEVERE
GALE CONDITIONS WITH GUSTS OF 40 TO 45 KTS WILL REMAIN IN ALL ZONES
BEFORE BEGINNING TO EASE IN THE NORTHERN WATERS TUESDAY MORNING AND
EASE IN THE SOUTHERN WATERS WEDNESDAY EARLY MORNING.
AFTER THESE WINDS EASE IN THE NORTHERN WATERS, IT WILL TAKE SOME
TIME FOR THE STEEP SHORT PERIOD WAVES TO DISSIPATE. A SMALL CRAFT
ADVISORY WILL MORE LIKELY THAN NOT BE WARRANTED THROUGH TUESDAY
AFTER THE WINDS HAVE DIED BELOW GALE WARNING CRITERIA. THE SOUTHERN
WATERS CAN EXPECT LARGER, STEEPER AND MORE HAZARDOUS SEAS BUILDING
13 TO 15 FT THROUGH TUESDAY AS LOCAL STEEP NORTHERLY WAVES MIX WITH
A NW SWELL OF 9FT @ 13S. WHILE THESE NORTHERLY WINDS EASE GREATLY
WEDNESDAY, THE TYPICALLY WINDY SPOTS NEAR AND DOWNWIND OF CAPE
MENDOCINO WILL CONTINUE TO BLOW AT 15 TO 20 KTS THROUGH THE REST OF
THE WEEK AND LIKELY LONGER. THE AFOREMENTIONED NW SWELL WILL
DECREASE IN SIZE AND WILL ALSO REMAIN THROUGH THE WEEK INTO THE
WEEKEND.
EKA WATCHES/WARNINGS/ADVISORIES
CA...
FROST ADVISORY FROM 3 AM TO 9 AM PDT TUESDAY FOR CAZ101-103-
109>115.
NORTHWEST CALIFORNIA COASTAL WATERS...
GALE WARNING UNTIL 4 AM PDT TUESDAY FOR PZZ450-470.
GALE WARNING UNTIL 10 AM PDT TUESDAY FOR PZZ455.
GALE WARNING UNTIL 5 AM PDT WEDNESDAY 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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