409  
FXUS66 KEKA 050724  
AFDEKA  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE EUREKA CA  
1224 AM PDT SUN OCT 5 2025  
   
SYNOPSIS  
DRY AND WARMER WEATHER IS FORECAST FOR THE NEXT  
SEVERAL DAYS AS A RIDGE OF HIGH PRESSURE BUILDS OVER THE WEST  
COAST. THE NEXT CHANCE FOR RAIN MAY BE LATE NEXT WEEK AS ANOTHER  
TROUGH APPROACHES THE REGION.  
 
 
   
DISCUSSION  
 
AN UPPER LEVEL SHORTWAVE IS CURRENTLY MOVING SOUTH ALONG THE PACIFIC  
NORTHWEST COAST AND WILL MOVE OVER OUR REGION SUNDAY. THIS SHORTWAVE  
WILL BRING SOME HIGH CLOUDS TO THE REGION BUT OTHERWISE THE MAIN  
IMPACT OF ITS PASSAGE WILL BE TO ENHANCE OFFSHORE FLOW AND DRYING AT  
THE SURFACE. COASTAL CLOUDS TONIGHT WILL QUICKLY BE SCOURED OUT  
LEAVING WHAT SHOULD BE CLEAR CONDITIONS SUNDAY NIGHT THROUGH  
TUESDAY. WARMING ALOFT AS RIDGING BUILDS BEHIND THE SHORTWAVE  
PASSAGE AND OFFSHORE FLOW WILL RESULT IN ABOVE NORMAL HIGH  
TEMPERATURES FOR MUCH OF THE REGION MONDAY THROUGH TUESDAY. SOME  
COASTAL AREAS COULD SEE HIGHS REACHING INTO THE LOWER 70S, IF NOT A  
LITTLE WARMER IN SOME LOCATIONS. INTERIOR AREAS WILL REACH INTO THE  
80S AND COULD PUSH 90 DEGREES IN A FEW OF THE TYPICALLY HOTTER  
LOCATIONS. NONE OF THESE TEMPERATURES ARE ANYWHERE CLOSE TO  
RECORD HIGHS FOR THE TIME OF YEAR BUT IT WILL STILL FEEL VERY WARM  
AFTER THE RECENTLY COOL PERIOD.  
 
THE NEXT WEATHER CHALLENGE IS THE POTENTIAL FOR AN UPPER LOW TO CUT-  
OFF FROM THE FLOW OFF THE NORTHWEST CALIFORNIA COAST. GUIDANCE  
CONTINUES TO REMAIN SPLIT WITH A LITTLE MORE THAN 60% OF THE  
ENSEMBLES FAVORING THIS SOLUTION WHILE A LITTLE LESS THAN 40%  
INDICATE THE LOW MAY MOVE STRAIGHT DOWN THE COAST INSTEAD OF  
RETROGRADING TOWARD THE WEST OR WILL NOT BECOME A CLOSE LOW AT ALL  
AND REMAIN A TROUGH. REGARDLESS, THERE WILL BE A POTENTIAL FOR RAIN  
STARTING LATE IN THE WEEK AND INTO THE WEEKEND WITH A SLIGHT  
POTENTIAL FOR THUNDERSTORMS, ESPECIALLY IF THE COLDER CLOSED-OFF LOW  
SOLUTIONS WIN OUT AND THE UPPER LOW EVENTUALLY MOVES OVER THE  
REGION. /RPA  
 
 
   
AVIATION  
 
STRATUS HAS FORMED AROUND HUMBOLDT BAY AND INTO THE SURROUNDING  
RIVER VALLEYS. CEILINGS AT ACV AND FOT ARE LIFR AND SOME  
RESTRICTED VISIBILITIES WILL BE POSSIBLE. OFFSHORE WIND ALOFT IS  
HELPING TO KEEP OTHER AREAS CLEAR, AND COULD HELP CLEAR AREAS  
AROUND HUMBOLDT BAY OVERNIGHT. ANY REMAINING CLOUDS ARE LIKELY TO  
CLEAR SHORTLY AFTER SUNRISE. BREEZY NORTHERLY WINDS ARE LIKELY  
AGAIN IN THE AFTERNOON, ESPECIALLY AT CEC, BUT GUSTS WILL BE  
LIGHTER THAN SATURDAY, PEAKING AROUND 20 KTS. INTERIOR AREAS,  
INCLUDING UKI, ARE LIKELY TO REMAIN VFR FOR THE NEXT 24 HOURS. JB  
 
 
   
MARINE  
 
NORTHERLY WINDS WILL CONTINUE TO STRENGTHEN INTO SUNDAY. GALE  
CONDITIONS ARE ONGOING IN THE SOUTHERN WATERS AROUND AND SOUTH OF  
CAPE MENDOCINO. GALE CONDITIONS WILL SPREAD INTO THE NORTHERN  
OUTER WATERS STARTING EARLY THIS MORNING. STEEP, WIND DRIVEN SEAS  
OF 7- 9 FT WILL REMAIN IN THE WATERS INTO MONDAY. PROPAGATION OF  
STEEP SEAS OF 7 FT IS LIKELY TO CONTINUE INTO THE NORTHERN INNER  
ZONE 450 PERIODICALLY THROUGH TONIGHT. A WEAK SURFACE LOW WILL  
BEGIN TO DEVELOP OVER THE COASTAL WATERS MONDAY AS DRY OFFSHORE  
WINDS FORM INLAND. THIS WILL CLEAR OUT THE MARINE LAYER CLOUDS AND  
GREATLY EASE WINDS DOWN TO A LIGHT BREEZE. THESE CONDITIONS WILL  
CONTINUE THROUGH MOST OF TUESDAY WITH LIGHT TO GENTLE BREEZES  
EXPECTED FROM STRENGTHENING NORTHERLY WINDS. THE NORTHERLY WINDS  
ARE THEN FORECAST TO STRENGTHEN TUESDAY NIGHT THROUGH WEDNESDAY  
NIGHT. JJW  
 
 
   
EKA WATCHES/WARNINGS/ADVISORIES  
 
CA...  
NONE.  
NORTHWEST CALIFORNIA COASTAL WATERS...  
SMALL CRAFT ADVISORY UNTIL 11 AM PDT THIS MORNING FOR  
PZZ450-455.  
 
SMALL CRAFT ADVISORY UNTIL 3 AM PDT EARLY THIS MORNING FOR  
PZZ470.  
 
GALE WARNING UNTIL 11 AM PDT THIS MORNING FOR PZZ470.  
 
GALE WARNING UNTIL 11 AM PDT THIS MORNING 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  
 
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HTTPS://WWW.FACEBOOK.COM/NWSEUREKA  
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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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