690
FXUS66 KEKA 120900
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
100 AM PST WED NOV 12 2025
SYNOPSIS
EARLY THIS MORNING, PATCHY FOG AND LOW CLOUDS ARE
EXPECTED TO CONTINUE. A STRONG FRONT IS BRINGING RAIN AND STRONG
WINDS THIS AFTERNOON THROUGH THURSDAY MORNING. SHOWERS AND
POSSIBLY A THUNDERSTORM ARE EXPECTED THURSDAY WITH DRIER WEATHER
EXPECTED FRIDAY AND SATURDAY. THE NEXT SYSTEM IS EXPECTED SUNDAY
AND MONDAY.
KEY MESSAGES:
- RAIN BEGINS LATE WEDNESDAY AND TAPERS OFF THURSDAY MORNING.
LOCALLY HEAVY RAIN IS EXPECTED LATE IN THE EVENING AND
OVERNIGHT.
- STRONG WINDS WEDNESDAY AFTERNOON AND OVERNIGHT. WIND GUSTS OF 40
TO 50 MPH WITH LOCALLY HIGHER GUSTS AT WIND PRONE RIDGES AND
COASTAL HEADLANDS.
- POTENTIAL FOR THUNDERSTORMS THROUGH THE DAY THURSDAY.
DISCUSSION
WATER VAPOR SATELLITE SHOWS THREE WEATHER FEATURES
IN THE EASTERN PACIFIC EARLY THIS MORNING. THE FIRST OF THESE IS A
FRONTAL BOUNDARY THAT CONTINUES TO USHER IN HIGH CLOUDS FOR
NORTHWEST CALIFORNIA. SECOND, A STRONG COMPACT LOW PRESSURE
SYSTEM, ASSOCIATED WITH THE CURRENT FRONT, REMAINS BEHIND IT. AN
UPPER LEVEL TROUGH AND ASSOCIATED FRONTAL BOUNDARY DROPS SOUTH AND
ABSORBS THE COMPACT AREA OF LOW PRESSURE. WEDNESDAY, THIS TROUGH
CONTINUES TO APPROACH THE AREA AND STARTS TO BECOME A CUTOFF LOW.
THE SURFACE LOW IS FORECAST TO RAPIDLY DEEPEN AS IT APPROACHES THE
COAST. THIS IS ANTICIPATED TO START INCREASING SOUTHERLY WINDS
THROUGH THE DAY WEDNESDAY. FROM WEDNESDAY INTO THURSDAY MORNING,
VARIOUS MODELS DEPICT 925MB WINDS FROM 65 TO 75 KTS JUST OFF THE
DEL NORTE COAST. THE MODELS SHOW THE STRONGEST WINDS GENERALLY
REMAINING NEAR OR JUST OFF THE COAST. HOWEVER, SOME OF THE
STRONGER WINDS ARE EXPECTED TO MAKE IT ONSHORE, MAINLY FOR THE
RIDGES AND EXPOSED COASTAL AREAS.
WIND ADVISORIES HAVE BEEN ISSUED FOR DEL NORTE, HUMBOLDT,
TRINITY, MENDOCINO, AND LAKE COUNTIES, ALL OCCURRING WEDNESDAY
THROUGH THURSDAY AT DIFFERENT TIMES AS THE STRONG WINDS AFFECT
EACH AREA. A HIGH WIND WARNING HAS BEEN ISSUED FOR THE MENDOCINO
COAST VERY LATE WEDNESDAY AND INTO THURSDAY MORNING AS WINDS SEEM
ESPECIALLY STRONG FOR THIS AREA.
AS THE FRONT MOVES ONSHORE EARLY WEDNESDAY EVENING, RAIN IS FORECAST
TO BEGIN IN THE KING RANGE AND MENDOCINO COUNTY FIRST. THE FRONT
WILL QUICKLY MOVE NORTH, DROPPING 1 TO 2 INCHES FROM ABOUT
WEDNESDAY AFTERNOON THROUGH VERY EARLY FRIDAY. LOCALIZED AMOUNTS
OF OVER 3 INCHES COULD OCCUR FOR THE KING RANGE, AS WELL AS SOME
OF THE HIGHER TERRAIN AREAS. OVERALL, THE AXIS OF HEAVIEST RAIN
HAS SHIFTED SOUTH WITH THE FOCUS ON MENDOCINO COUNTY AND THE KING
RANGE. WITH THE CHANGES IN POSITION OF THE SYSTEM IT IS ALSO
WARMER. SNOW LEVELS HAVE RISEN AND IT LOOKS LIKE MOST SNOW WILL
STAY ABOVE 5,000 FEET. AS A RESULT, SNOW WILL MOST LIKELY REMAIN
ABOVE THE MAIN HIGHWAYS, EVEN SCOTT MT PASS. A WARMER SYSTEM WILL
ALSO LIMIT THE POTENTIAL FOR SMALL HAIL AND THUNDERSTORMS. THERE
MAY STILL BE A RUMBLE OF THUNDER OR TWO, BUT HAVE KEPT SMALL HAIL
OUT OF THE FORECAST.
LATE WEDNESDAY NIGHT AS THE FRONT IS MOVING ONSHORE THE MODELS SHOW
THE ASSOCIATED LOW PRESSURE SYSTEM STALL OUT AND BEGIN TO HEAD
SOUTHWEST BY VERY EARLY FRIDAY. AT THIS POINT THE AREA OF LOW
PRESSURE BECOMES MORE VERTICALLY STACKED AND CONTINUES TO WEAKEN.
HOW STRONG THE SOUTHERLY WINDS ARE AND HOW HEAVY THE SHOWERS ARE
WILL BE HIGHLY DEFENDANT ON HOW CLOSE THE LOW STAYS.
DRIER WEATHER IS EXPECTED FRIDAY AND SATURDAY AS THE UPPER LOW DROPS
AWAY FROM THE AREA AND HIGH PRESSURE BRIEFLY BUILDS INTO THE AREA.
THERE IS A SMALL CHANCE FOR FROST DURING THIS TIME, BUT WITH THE
RECENT RAINFALL THE VALLEYS AND COASTAL AREAS WILL LIKELY FOG UP
BEFORE IT CAN FROST.
SUNDAY AND INTO MONDAY ANOTHER WEATHER SYSTEM IS EXPECTED TO
APPROACH THE AREA AND BECOME A CUTOFF LOW. THERE IS STILL A LOT OF
UNCERTAINTY ON THIS SYSTEM, BUT IT LOOKS LIKE IT WILL BE WEAKER THAN
THE PREVIOUS SYSTEM. MKK
AVIATION...(6Z TAFS)
STRATUS HAS RETURNED TO THE COASTAL
TERMINALS WITH LIFR CEILINGS BEING OBSERVED. VISIBILITIES HAVE BEEN
FLUCTUATING BETWEEN 1/4SM AND 1 SM. AN APPROACHING LOW IS EXPECTED
TO DISRUPT THE MARINE LAYER AND WEAKEN THE MARINE INVERSION.
CEILINGS ARE FORECAST TO LIFT TO IFR, OR PERHAPS MVFR AFTER 12Z. A
DEEPER MARINE LAYER AND SOUTH WINDS IS LIKELY TO BRING STRATUS UP
THE RUSSIAN RIVER VALLEY TO UKI. MVFR TO IFR CEILINGS ARE FORECAST
AND MODEL GUIDANCE SUGGESTS THE CLOUDS REMAINING STUBBORN THOUGH THE
DAY. GUSTY SOUTH WINDS WILL BUILD AHEAD OF AN APPROACHING FRONT IN
THE AFTERNOON AND EVENING, WITH THE STRONGEST GUSTS LIKELY
OVERNIGHT. JB
MARINE
AN APPROACHING SYSTEM HAS STARTED TO TURN WINDS SOUTHERLY.
THESE WILL GRADUALLY BUILD TODAY AND PEAK WEDNESDAY NIGHT. GALE
FORCE GUSTS ARE LIKELY BY THE AFTERNOON AND STORM FORCE GUSTS ARE
POSSIBLE AS THE FRONT PASSES THROUGH THE AREA. IN ADDITION TO
HAZARDOUS WINDS, STEEP WIND WAVES OVER 10 FT ARE EXPECTED TONIGHT
THROUGH THURSDAY.
WINDS EASE THURSDAY BEHIND THE FRONTAL PASSAGE, ESPECIALLY SOUTH OF
CAPE MENDOCINO. THE SURFACE LOW IS FORECAST TO BE NEAR OR IN THE
NORTHERN WATERS, WHICH MAY CONTINUE STRONG SOUTHERLY WINDS. THIS IS
HIGHLY DEPENDENT ON MINOR MOVEMENTS IN THE LOW AND MODEL SPREAD IS
SIGNIFICANT. WINDS COULD RANGE FROM SUB-GALE TO STRONG GALE FORCE
GUSTS IN THE WATERS NORTH OF CAPE MENDOCINO.
CONFIDENCE IS HIGHER ON WINDS EASING BY FRIDAY, HOWEVER SEAS WILL BE
ELEVATED AS A LARGE MID-PERIOD WESTERLY SWELL FILLS IN THURSDAY
NIGHT. COMBINED SEAS OF 16-18 FT ARE POSSIBLE, BUT THESE ARE
FORECAST TO SUBSIDE THROUGH THE DAY FRIDAY. SEAS ARE FORECAST TO DIP
BELOW 10 FT FRIDAY NIGHT INTO SATURDAY MORNING. NORTHERLIES RETURN
SATURDAY, WITH BREEZY WINDS POSSIBLE SOUTH OF CAPE MENDOCINO. JB
EKA WATCHES/WARNINGS/ADVISORIES
CA...
WIND ADVISORY FROM 2 AM TO 8 AM PST THURSDAY FOR CAZ101.
WIND ADVISORY FROM 4 PM WEDNESDAY TO 8 AM PST THURSDAY FOR
CAZ102.
WIND ADVISORY FROM 6 PM WEDNESDAY TO 6 AM PST THURSDAY FOR
CAZ103.
WIND ADVISORY FROM 1 PM WEDNESDAY TO 6 AM PST THURSDAY FOR
CAZ104>106.
WIND ADVISORY FROM 7 PM WEDNESDAY TO 6 AM PST THURSDAY FOR
CAZ107-108.
HIGH WIND WARNING FROM 7 PM WEDNESDAY TO 6 AM PST THURSDAY
FOR CAZ109.
WIND ADVISORY FROM 7 PM WEDNESDAY TO 1 AM PST THURSDAY FOR
CAZ110>113.
WIND ADVISORY FROM 10 PM WEDNESDAY TO 4 AM PST THURSDAY FOR
CAZ114-115.
NORTHWEST CALIFORNIA COASTAL WATERS...
GALE WARNING FROM 3 PM WEDNESDAY TO 8 AM PST THURSDAY FOR
PZZ450.
GALE WARNING FROM 3 PM WEDNESDAY TO 6 AM PST THURSDAY FOR
PZZ455.
GALE WARNING FROM 6 AM TO 7 PM PST WEDNESDAY FOR PZZ470.
GALE WARNING FROM 3 AM TO 3 PM PST THURSDAY FOR PZZ470-475.
STORM WARNING FROM 7 PM WEDNESDAY TO 3 AM PST THURSDAY FOR
PZZ470-475.
GALE WARNING FROM 8 AM TO 7 PM PST 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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