850  
FXUS66 KEKA 122207  
AFDEKA  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE EUREKA CA  
307 PM PDT MON APR 12 2021  
   
SYNOPSIS
 
GUSTY NORTHERLY WINDS WILL CONTINUE ALONG THE COAST  
EACH AFTERNOON AND EVENING TODAY AND TUESDAY. OTHERWISE, MOSTLY  
CLEAR SKIES WITH COOL NIGHTS AND MILD TO WARM DAYS ARE EXPECTED.  
 

 
   
DISCUSSION
 
HIGH PRESSURE AND OFFSHORE FLOW CONTINUES TO BRING  
CLEAR SKIES AND DRY CONDITIONS TO THE REGION. AS THE WEEK  
PROGRESSES, AN UPPER LEVEL LOW DROPS INTO EASTERN OREGON  
WEAKENING THE PRESSURE GRADIENT. EARLY TUESDAY MORNING THE HREF,  
AND TO A LESSER EXTEND THE NBM, IS SHOWING SOME STRATUS DEVELOPING  
IN THE EEL RIVER DELTA AND AROUND HUMBOLDT BAY. THIS SEEMS  
REASONABLE WITH THE LIGHTER WINDS AND MORE NORTHERLY FLOW. DRY  
CONDITIONS AND MAINLY CLEAR SKIES ARE EXPECTED TO CONTINUE WITH  
THIS VERY DRY WEATHER SYSTEM. THE MOST NOTABLE CHANGE WILL BE  
TEMPERATURES 5 TO 10 DEGREES COOLER ACROSS THE INTERIOR AREAS.  
WINDS WILL INCREASE ACROSS THE INTERIOR IN THE AFTERNOON. THE  
COASTAL AREAS MAY ACTUALLY INCREASE A FEW DEGREES AS THE OFFSHORE  
FLOW PICKS UP THROUGH THE DAY. MOSTLY CLEAR SKIES AND DRY  
CONDITIONS ARE EXPECTED TO CONTINUE.  
 
TUESDAY NIGHT INTO WEDNESDAY MORNING NORTHEASTERLY WINDS  
(OFFSHORE FLOW) CONTINUE TO INCREASE. THIS WILL BE MOST NOTABLE  
ON THE RIDGES NEAR THE COAST AND IN SOUTHEASTERN LAKE COUNTY.  
GUSTS OF 20 TO 30 MPH WILL BE POSSIBLE ON THE RIDGES. POOR RH  
RECOVERIES ARE EXPECTED DURING THIS TIME. THIS WILL ELEVATE FIRE  
WEATHER DANGER IN SOUTHEASTERN LAKE COUNTY.  
 
WEDNESDAY AND THURSDAY THE UPPER LEVEL SLOWLY MOVES OFF TO THE  
AND SLOWLY WEAKENS. THIS WILL DIMINISH THE WINDS, ALTHOUGH INLAND  
TEMPERATURES WILL REMAIN IN THE UPPER 60S TO LOW 70S. AT THE  
COAST THE LIGHTER WINDS COULD BRING SOME STRATUS AS EARLY AS  
THURSDAY MORNING AS THE OFFSHORE FLOW WEAKENS. THIS MAY NEED TO BE  
ADDED TO THE FORECAST ONCE IT GETS CLOSER.  
 
LATE IN THE WEEK AND INTO THE WEEKEND HIGH PRESSURE IS EXPECTED TO  
BUILD INTO THE AREA. THIS WILL GRADUALLY INCREASE TEMPERATURES  
THURSDAY THROUGH SUNDAY WHICH WILL SEE HIGHS IN THE LOW 80S  
ACROSS THE INTERIOR. CLOSER TO THE COAST THERE IS MORE UNCERTAINTY  
IN THE TEMPERATURES AND THERE IS THE POTENTIAL FOR SOME STRATUS  
WITH THE LIGHT WINDS. /MKK /EYS  
 

 
   
AVIATION
 
VFR CONDITIONS PREVAILED AT THE TERMINALS THROUGH  
MIDDAY, WITH THE EXCEPTION OF KACV WHERE LIGHT WINDS ALLOWED SOME  
PESKY STRATUS PATCHES TO DRIFT OVER FROM HUMBOLDT BAY AND BECOME  
PINCHED ALONG THE IMMEDIATE COAST. DAYTIME HEATING WON OUT AS  
NORTHERLY WINDS BEGAN INCREASING FOR THE AFTERNOON. INCLUDED SOME  
WIND SHEAR IN THE TAFS FOR THE NORTHERLY AND NORTHEASTERLY WINDS  
ALOFT. LOOKED MOST PRONOUNCED AT KACV, AND MORE MARGINAL ELSEWHERE.  
THE DRY NORTHERLY FLOW SHOULD PREVENT MUCH STRATUS OR FOG FROM  
DEVELOPING TONIGHT; HOWEVER, COULD SEE A SIMILAR MIGRATION OF PATCHY  
LOW CLOUDS FROM HUMBOLDT BAY TO KACV IN THE EARLY MORNING HOURS FOR  
VERY BRIEF MVFR CIGS AND VIS. GUSTY NORTHERLY WINDS WILL DEVELOP  
ONCE AGAIN TOMORROW, WITH MORE NORTHEASTERLY FLOW ALOFT TOMORROW  
NIGHT.  
 

 
   
MARINE
 
GALE WARNINGS CONTINUE THROUGH ACROSS THE OUTER  
WATERS WHILE WINDS ARE EXPECTED TO REACH NEAR GALE IN THE INNERS  
LATE THIS AFTERNOON. AN UPPER-LEVEL LOW WILL BEGIN TO DROP DOWN FROM  
THE NORTH AND NUDGE WEST TOMORROW NIGHT, AND THIS WILL BEGIN A  
WEAKENING TREND THROUGH THE FIRST HALF OF THIS WEEK, WITH EACH  
SUCCESSIVE AFTERNOON'S PULSE IN STRENGTH WEAKENING WITH EACH DAY.  
EXTENDED THE CURRENT MARINE PRODUCTS IN THE AFTERNOON PACKAGE TO  
COVER THE ONGOING HAZARDOUS SEAS THAT WILL REMAIN OVERNIGHT AS THE  
GALE TEMPORALLY EASES A BIT, BEFORE CRANKING BACK UP TOMORROW. SEAS  
WILL CONTINUE TO BE PRIMARILY LOCALLY GENERATED FOR THE FORESEEABLE  
FUTURE, RESPONDING TO FLUCTUATIONS IN NEARSHORE NORTHERLY WINDS.  
THUS, SEAS WILL PULSE EACH EVENING AS WELL, FOLLOWING A SIMILAR  
WEAKENING TREND THROUGH THE FIRST HALF OF THIS WEEK. THE WINDS LOOK  
TO WEAKEN FURTHER LATE WEEK AS THE UPPER-LOW FADES AND THE GRADIENT  
BECOMES DIFFUSE. A WELL-DEFINED RIDGE AXIS IS LOOKING LIKELY TO MOVE  
OVERHEAD LATE THIS WEEK, POTENTIALLY KEEPING LOCAL WINDS DOWN  
THROUGH THE WEEKEND.  
 

 
   
EKA WATCHES/WARNINGS/ADVISORIES
 
 
CA...NONE.  
NORTHWEST CALIFORNIA COASTAL WATERS...HAZARDOUS SEAS WARNING UNTIL 4 AM PDT WEDNESDAY FOR PZZ450.  
 
GALE WARNING UNTIL 4 AM PDT WEDNESDAY FOR PZZ470-475.  
 
SMALL CRAFT ADVISORY UNTIL 4 AM PDT WEDNESDAY FOR PZZ455.  
 

 
 

 
 
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.

The Nexlab CA Page Main Text Page