295
FXUS66 KEKA 251006
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
206 AM PST SUN JAN 25 2026
SYNOPSIS
DRY CONDITIONS WILL CONTINUE ACROSS THE AREA TODAY
AND INTO EARLY WORK WEEK WITH SOME PARTICULARLY COLD MORNINGS
WITH LOWS NEAR FREEZING AND FREEZING. CONDITIONS WILL SLIGHTLY
WARM AND MOISTEN NEXT WEEK WITH INCREASING CHANCES OF WETTING RAIN
BY MID WEEK.
DISCUSSION
PERSISTENT HIGH PRESSURE OVER THE NORTHEASTERN
PACIFIC HAS BEGUN TO SHIFT EASTWARD, PROMOTING VERY DRY AND STABLE
CONDITIONS ACROSS THE REGION. LATEST SATELLITE IMAGERY DEPICTS
HIGH-LEVEL MOISTURE AROUND THE NORTHERN PERIPHERY OF THE RIDGE,
WITH SOME CIRRUS CLOUDS SPREADING SOUTHEASTWARD ACROSS NW CALIFORNIA.
COLD, DRY AIR ADVECTION, ALONGSIDE OFFSHORE WINDS AND CLEAR TO
PARTLY CLOUDY SKIES, IS PROMOTING EFFICIENT RADIATIONAL COOLING
ACROSS THE AREA, RESULTING IN COLD OVERNIGHT TEMPERATURES. SURFACE
OBSERVATIONS REPORTED NEAR FREEZING TO FREEZING TEMPERATURES ACROSS
THE INTERIOR VALLEYS, WITH LOWS IN THE MID-20S TO MID 30S. COLD
WEATHER ADVISORY IS IN EFFECT UNTIL 9 AM FOR APPARENT TEMPERATURES
BELOW 30F DEGREES FOR SOUTHERN INTERIOR MENDOCINO AND SOUTHERN
LAKE COUNTIES, AND FOR APPARENT TEMPERATURE BELOW 20F DEGREES FOR
TRINITY COUNTY.
HIGH PRESSURE IS EXPECTED TO SLOWLY WEAKEN AND FLATTEN TODAY INTO
MONDAY AS A WEAK SHORTWAVE TROUGH MOVES NORTH OF THE AREA, BRINGING
AND INCREASING CLOUDINESS. THE 500 MB RIDGE APPEARS TO SLOWLY
BUILD BACK EARLY NEXT WEEK, WITH CONDITIONS SLIGHTLY WARMING UP.
THE PATTERN SHIFT AS THE RIDGING FINALLY BREAKS DOWN AND AN UPPER
LEVEL TROUGH DIG SOUTHWARD ACROSS THE PACIFIC AND APPROACHES THE
AREA BY MID WEEK. AT THIS MOMENT, THERE IS A 50 TO 80 PERCENT
CHANCES OF WETTING RAIN (0.01 INCH OR MORE) TUESDAY AFTERNOON
THROUGH WEDNESDAY AFTERNOON, WITH THE HIGHEST PROBABILITIES ALONG
COASTAL RANGE IN DEL NORTE, HUMBOLDT AND MENDOCINO. THERE ARE NO
MAJOR IMPACTS EXPECTED WITH THIS WEATHER SYSTEM; IF PRECIPITATION
DOES OCCUR, IT WOULD BE MORE BENEFICIAL THAN IMPACTFUL, ESPECIALLY
AFTER THE RECENT DRY SPELL.
ENSEMBLES AND WPC CLUSTER ANALYSIS SUGGEST ANOTHER SHORTWAVE
TROUGH MAY (38% CHANCE) BRING ANOTHER CHANCE OF LIGHT SHOWERS FOR
THE NORTHERN PORTION OF THE AREA BY LATE IN THE WORK WEEK. /ZVS
AVIATION
VFR CONDITIONS AND CLEAR SKIES PREVAIL OVER ALL THE
TERMINALS. LOW DEWPOINTS AND CONTINUED OFFSHORE FLOW WILL LIKELY
KEEP SKIES CLEAR ACROSS THE AREA, ASIDE FROM A FEW AREAS OF PATCHY
VALLEY FOG. ANY FOG WILL LIKELY LIFT AND SCATTER SHORTLY AFTER
SUNRISE. SOUTHEAST WINDS INCREASE TOMORROW AND COULD BE BREEZY
OVER THE COASTAL HEADLANDS, ESPECIALLY CEC. JB
MARINE
SEAS CONTINUE TO SUBSIDE ARE LIKELY TO FALL BELOW 5 FT BY
TODAY AS WINDS REMAIN LIGHT. A SERIES OF SMALL, MID TO LONG PERIOD
WEST SWELLS FILL IN THROUGH WEDNESDAY, EACH PEAKING AT AROUND 5 FT.
WINDS TURN SOUTHERLY AND START TO INCREASE EARLY MONDAY. NBM CURRENTLY
SHOWS ABOUT A 70% CHANCE FOR GALE FORCE GUSTS IN THE OUTER WATERS
BY TUESDAY, WITH SLIGHTLY HIGHER CONFIDENCE NORTH OF CAPE MENDOCINO.
A LARGE WESTERLY SWELL LOOKS TO THEN BUILD IN WEDNESDAY NIGHT AND
THURSDAY. JJW/JB
EKA WATCHES/WARNINGS/ADVISORIES
CA...
COLD WEATHER ADVISORY UNTIL 9 AM PST SUNDAY FOR CAZ108-113-
115.
NORTHWEST CALIFORNIA COASTAL WATERS...
SMALL CRAFT ADVISORY FROM 10 AM MONDAY TO 2 AM PST TUESDAY
FOR PZZ470-475.
GALE WATCH FROM LATE MONDAY NIGHT THROUGH TUESDAY EVENING
FOR PZZ470-475.
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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