958
FXUS66 KEKA 150836
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
136 AM PDT MON SEP 15 2025
SYNOPSIS
A RIDGING PATTERN WILL BRING SCATTERED TO CLEAR SKIES
AND DRY CONDITIONS WITH RH VALUES IN THE TEENS EARLY TO MID WEEK.
A WARMING TREND RETURNS TO THE INTERIOR STARTING MONDAY THROUGH
MID WEEK AND POSSIBLY A RETURN TO WET WEATHER LATE IN THE WORK
WEEK.
DISCUSSION
A WARMING TREND WILL SET IN THIS WEEK AS MODELED
500MB PATTERNS SHOW A RIDGING PATTERN UPSTREAM. CLEARING OF
COASTAL STRATUS DURING DAYTIME HOURS WILL HIGHLIGHT FAIR WEATHER
FOR THE NEXT FEW DAYS. THE HIGHEST TEMPERATURES WILL BE FELT
TUESDAY AS 850MB TEMPERATURES SHOW THE UPPER- LEVEL HEIGHTS RISE
ACROSS THE WEST COAST. THIS WILL BRING A WARMER TEMPERATURES AND
LOW RH EARLY TO MID WEEK, WITH THE DRIEST/WARMEST DAYS MOST
LIKELY MONDAY THROUGH WEDNESDAY. MONDAY INTO TUESDAY, BREEZY
OFFSHORE WINDS ARE EXPECTED OVER THE RIDGES OVER THE EASTERN
PORTION OF THE FORECAST AREA, PARTICULARLY IN THE MOUNTAINS OF DEL
NORTE. INTERIOR VALLEYS ARE FORECAST REBOUND TO THE MID TO UPPER
90'S BY TUESDAY. TEMPERATURES AROUND 100-102 ARE EXPECTED AT
WILLOW CREEK, BIG BAR AND AREAS ALONG THE HWY 96 BETWEEN
WEITCHPEC AND ORLEANS. THE RIDGE BEGINS TO WEAKEN AND MOVE
EASTWARD BY WEDNESDAY AND THURSDAY AS A TROUGH APPROACHES THE
PACIFIC NORTHWEST. SOME ENSEMBLE MEMBERS ARE SHOWING A CUTOFF LOW
FORMING OVER THE COAST OF CALIFORNIA, WHICH COULD RETURN MONSOONAL
MOISTURE TO THE AREA. THE ARRANGEMENT OF THE PACIFIC NORTHWEST
TROUGH AND THE LOW OVER THE COAST OF CALIFORNIA ARE BOTH
UNCERTAIN, SO CONFIDENCE IS LOW ON ANY IMPACTS. IF IT DOES END UP
ON THE WETTER END (~25% OF ENSEMBLE MEMBERS), SHOWERS AND
THUNDERSTORMS ARE POSSIBLE FOR THE INTERIOR AREAS.
STAY TUNED. (WWW.WEATHER.GOV/EKA/)
/EYS /JB
AVIATION...(06ZTAFS)
MODEL SOUNDINGS ARE NOT CONFIDENT IN THE
MARINE LAYER RETURNING TONIGHT, YET ADDED AMBIENT MOISTURE ON THE
SURFACE WILL POTENTIALLY LEAD TO RADIATION FOG ALONG THE SURFACE IF
THERE IS NO SIGNIFICANT CLOUD COVERAGE INTO MONDAY MORNING. IFR TO
LIFR CONDITIONS ARE MOST LIKELY TO FORM FOR TERMINALS AROUND
HUMBOLDT BAY AND POTENTIALLY DOWN RIVER VALLEYS AROUND HUMBOLDT
COUNTY. INLAND, CALM TO LIGHT MOSTLY DIURNAL WINDS ARE EXPECTED
WITH WNW WINDS DEVELOPING INTO THE AFTERNOON FOR MOST INLAND
TERMINALS AND VFR CONDITIONS THROUGH THE TAF PERIOD.
MARINE
A NW SWELL OF 5FT@12S WILL DOMINATE THE WATERS BEFORE
HIGH PRESSURE SLOWLY RETURNS BEGINNING MONDAY. STRONG WINDS AND
STEEP WIND WAVES HAVE CALLED FOR A SMALL CRAFT ADVISORY FOR THE
OUTER WATERS UNTIL MONDAY AFTERNOON. THESE STRONGER PRESSURE
GRADIENT WINDS WILL BE SHORT LIVED AND WILL DIMINISH INTO TUESDAY.
CONDITIONS AT THE END OF THIS WORK WEEK ARE FORECAST TO HAVE STRONG
NORTHERLY WINDS AND LARGE WIND WAVES, BUT MODELS ARE NOT CONFIDENT
ON THE EXTENT OF THE WIND SPEED AS OF RIGHT NOW. MORE TO COME.
EKA WATCHES/WARNINGS/ADVISORIES
CA...
NONE.
NORTHWEST CALIFORNIA COASTAL WATERS...
SMALL CRAFT ADVISORY UNTIL 5 PM PDT THIS AFTERNOON 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.
VISIT US AT HTTPS://WWW.WEATHER.GOV/EUREKA
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FOR FORECAST ZONE INFORMATION
SEE THE FORECAST ZONE MAP ONLINE:
HTTPS://WWW.WEATHER.GOV/IMAGES/EKA/ZONEMAP.PNG
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