755
FXUS66 KEKA 110837
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
137 AM PDT THU SEP 11 2025
SYNOPSIS
INTERIOR SHOWERS AND ISOLATED THUNDERSTORMS THIS
AFTERNOON AND EARLY EVENING OVER THE HIGHER TERRAIN ACROSS THE
EASTERN PORTION OF THE FORECAST AREA. DRIER AND WARMER CONDITIONS
FRIDAY AND SATURDAY, FOLLOWED BY A PERIOD OF MORE RAIN POSSIBLE ON
SUNDAY. DRIER AND WARMER WEATHER TREND RETURN EARLY NEXT WEEK.
DISCUSSION
THE SLOW-MOVING CLOSED UPPER-LEVEL LOW PRESSURE
CONTINUE TO SHIFTS EASTWARD OVER THE GREAT BASIN TODAY. GENERALLY
DRY WEATHER TODAY, EXCEPT FOR SOME ISOLATED TO SCATTERED SHOWERS
AND FEW THUNDERSTORMS AGAIN THIS AFTERNOON AND INTO EARLY EVENING
OVER THE HIGHER TERRAIN ACROSS THE EASTERN PORTION OF THE AREA.
TEMPERATURES ARE FORECAST TO BE VERY SIMILAR TO WEDNESDAY. SOME
ENHANCED WEST-NORTHWEST WIND ALONG THE SHORE AND CHANNELED ALONG
THE EEL RIVER VALLEY TODAY, DAYTIME WINDS WILL BE MOSTLY GENTLE
AND TERRAIN DRIVEN.
TONIGHT INTO FRIDAY, AREAS OF FOG AND PATCHY DENSE FOG ARE
ANTICIPATED ALONG THE SHELTER VALLEYS WITH CLEAR SKIES AND STRONG
RADIATIONAL COOLING. OVERNIGHT TEMPERATURES ARE FORECASTED TO BE
GENERALLY IN THE 50'S.
A SHORTWAVE RIDGE WILL BEGIN TO BUILDS IN DOWNSTREAM IN THE WAKE
TROUGH ON FRIDAY, PROMOTING DRIER AIR MASS AND CLEARING SKIES.
INLAND HIGHS ARE EXPECTED TO START TO WARM ON FRIDAY, WITH HIGHS
FORECASTED TO BE IN THE UPPER 70'S TO UPPER 80'S. ONSHORE FLOW
WILL REMAIN THE COASTAL AREAS IN THE LOW TO MID 60'S. AREAS OF
VALLEY FOG ARE EXPECTED TO DEVELOP AGAIN FRIDAY NIGHT INTO
SATURDAY.
DRY WEATHER IS EXPECTED FOR MUCH OF THE DAY ON SATURDAY AND
TEMPERATURES ARE EXPECTED TO BE 3 TO 5 DEGREES WARMER COMPARED
WITH FRIDAY'S HIGH TEMPERATURES FORECAST. THE RIDGE ALOFT WILL
SHIFT EASTWARD ON SATURDAY, WITH AN UPSTREAM H5 TROUGH APPROACHING
THE PACIFIC NORTHWEST AND NORTHERN CALIFORNIA. CLUSTER ANALYSIS
ARE NOT IN A GOOD AGREEMENT WITH THE POSITIONS OF THIS TROUGH.
MODELS CONTINUE SHOWING LIGHT PRECIPITATION ON SUNDAY, PRIMARILY
IN DEL NORTE, HUMBOLDT AND PORTIONS OF TRINITY COUNTIES. THERE IS
THE POTENTIAL FOR SOME THUNDERSTORMS NEAR THE NORTH COAST AS WELL.
MONDAY, HIGH PRESSURE BEGIN TO BUILD ACROSS THE WEST COAST WITH
850 MB TEMPERATURES WARMING. THIS WILL BRING A WARMING TREND EARLY
NEXT WEEK, WITH INTERIOR VALLEYS REACHING OR EXCEEDING THE 90'S
DEGREES ON MONDAY AND CONTINUE WARMING UP INTO THE UPPER 90'S THROUGH
MID NEXT WEEK ACROSS THE WARMER LOCATIONS OF TRINITY, LAKE,
INTERIOR MENDOCINO, AND INTERIOR HUMBOLDT COUNTIES. /ZVS
AVIATION...(6Z TAFS)
STRATUS REMAINED PERSISTENT AT THE COASTAL
TERMINALS FOR MUCH OF WEDNESDAY, AND IS LIKELY TO REMAIN OVERNIGHT.
IFR CONDITIONS ARE EXPECTED TO CONTINUE, BUT BRIEF DROPS TO LIFR ARE
POSSIBLE. INTERIOR VALLEYS, INCLUDING UKI, ARE OBSERVING MVFR
CEILINGS, WHICH ALSO MAY CONTINUE THROUGH THE NIGHT. LIFTING AND
SCATTERING OF CEILINGS IS EXPECTED AFTER SUNRISE. SKIES MAY CLEAR
FOR A FEW HOURS IN THE AFTERNOON, BUT STRATUS IS LIKELY TO RETURN
AGAIN IN THE EVENING. WINDS GENERALLY REMAIN LIGHT APART FROM
AFTERNOON BREEZES OF 10 KTS OR LESS. JB
MARINE
NORTHERLY WINDS HAVE RETURNED AS AN AREA OF LOW PRESSURE
MOVES OUT OF THE AREA. WINDS WILL PEAK IN THE AFTERNOON, WITH GUSTS
OF 20-25 KTS POSSIBLE IN THE OTHER WATERS. LOCALLY STRONGER GUSTS
AT OR AROUND 30 KTS ARE POSSIBLE AROUND CAPE MENDOCINO. NEARSHORE
WINDS GENERALLY REMAIN LIGHT. THIS PATTERN CONTINUES FRIDAY, BEFORE
WINDS EASE SATURDAY AS ANOTHER SYSTEM APPROACHES THE AREA.
NORTHERLIES RETURN AGAIN SUNDAY INTO EARLY NEXT WEEK. NBM IS SHOWING
50-80% PROBABILITIES FOR GALE FORCE GUSTS BY MONDAY.
SEAS ARE MOSTLY CHARACTERIZED BY BUILDING SHORT PERIOD WIND WAVES,
WHICH WILL BE STEEP AND HAZARDOUS TO SMALL CRAFTS. DESPITE LIGHTER
WINDS, STEEP SEAS ARE FORECAST TO PROPAGATE TO THE NEARSHORE WATERS
OF MENDOCINO, ESPECIALLY THURSDAY NIGHT THROUGH FRIDAY MORNING. A
LONG PERIOD NW SWELL FILLS IN FRIDAY, WHICH COMBINED WITH THE WIND
WAVES OF 6-7 FT, RESULTS IN COMBINED SEAS OF 7-10 FT BY FRIDAY
NIGHT. SEAS ARE FORECAST TO EASE SATURDAY INTO EARLY SUNDAY AS WINDS
EASE, BUT ANOTHER MID-PERIOD NW SWELL OF AROUND 8 FT IS FORECAST TO
FILL IN SUNDAY, KEEPING SEAS ELEVATED. ALONG WITH BUILDING SHORT
PERIOD WIND WAVES, COMBINED SEAS MAY EXCEED 10 FT. JB
BEACH HAZARD
A LONG PERIOD WEST-NORTHWEST SWELL WILL BUILD LATE
THIS AFTERNOON/EARLY EVENING WITH A SIGNIFICANT SWELL HEIGHTS
AROUND 3 TO 4 FEET AT 16 TO 17 SECONDS TONIGHT. THIS ENERGY SWELL
HAS THE POTENTIAL TO BRING A MODERATE RISK OF SNEAKER WAVES ,
ESPECIALLY BETWEEN 3 AM TO 8 AM PDT ON FRIDAY. A BEACH HAZARD
STATEMENT MAY BE NEEDED FOR THE BEACHES NORTH OF CAPE MENDOCINO.
STAY TUNED!. /ZVS
EKA WATCHES/WARNINGS/ADVISORIES
CA...
NONE.
NORTHWEST CALIFORNIA COASTAL WATERS...
SMALL CRAFT ADVISORY FROM 11 PM THURSDAY TO 11 AM PDT
FRIDAY FOR PZZ455.
SMALL CRAFT ADVISORY FROM 11 PM THURSDAY TO 11 PM PDT
FRIDAY FOR PZZ470.
SMALL CRAFT ADVISORY UNTIL 11 PM PDT FRIDAY 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.
VISIT US AT HTTPS://WWW.WEATHER.GOV/EUREKA
FOLLOW US ON FACEBOOK AND TWITTER AT:
HTTPS://WWW.FACEBOOK.COM/NWSEUREKA
HTTPS://WWW.TWITTER.COM/NWSEUREKA
FOR FORECAST ZONE INFORMATION
SEE THE FORECAST ZONE MAP ONLINE:
HTTPS://WWW.WEATHER.GOV/IMAGES/EKA/ZONEMAP.PNG
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page