208  
FXUS66 KEKA 201136  
AFDEKA  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE EUREKA CA  
436 AM PDT FRI SEP 20 2019  
   
SYNOPSIS
 
WARM DRY WEATHER WILL OCCUR ACROSS THE REGION THROUGH  
SATURDAY. LIGHT SHOWERS WILL BE POSSIBLE OVER DEL NORTE AND  
HUMBOLDT COUNTY ON SUNDAY, FOLLOWED BY ANOTHER PERIOD OF WARM DRY  
CONDITIONS DURING EARLY TO MIDDLE PORTIONS OF NEXT WEEK.  
 

 
   
DISCUSSION
 
UPPER HEIGHTS WERE INCREASING ACROSS THE REGION  
FRIDAY MORNING AS A RIDGE APPROACHED FROM THE WEST...WHILE IN THE  
LOW-LEVELS, LIGHT NORTH-NORTHEAST WINDS WERE OCCURRING ACROSS  
AREA RIDGETOPS. WITH THE EXCEPTION OF EEL RIVER VALLEY FOG, CLEAR  
SKIES PREVAILED, AND THAT WILL GIVE WAY TO MILD SUNNY CONDITIONS  
DURING FRIDAY AFTERNOON...WITH SIMILAR CONDITIONS EXPECTED DURING  
SATURDAY. ON SUNDAY, AN UPPER TROUGH IS FORECAST TO APPROACH THE  
AREA FROM THE NORTHWEST. MODEST ASCENT WILL YIELD MARGINAL DEEP-  
LAYER MOISTENING THAT MAY BE SUFFICIENT FOR LIGHT SHOWER  
DEVELOPMENT OVER PORTIONS OF HUMBOLDT AND DEL NORTE COUNTIES.  
 
SHOWER ACTIVITY WILL QUICKLY EXIT THE REGION DURING SUNDAY  
EVENING, FOLLOWED BY ADDITIONAL UPPER RIDGING AND LARGE-SCALE  
SUBSIDENCE. MODEL GUIDANCE SHOWS OFFSHORE WINDS REDEVELOPING AT  
850 MB DURING EARLY TO MIDDLE PORTIONS OF NEXT WEEK, WHICH WILL  
FAVOR ANOTHER PERIOD OF WARM DRY CONDITIONS. THEREAFTER, AN  
ANOMALOUSLY COLD UPPER TROUGH MAY DIG OVER THE WEST COAST LATE  
NEXT WEEK RESULTING IN COOLER AND POTENTIALLY SHOWERY WEATHER.  
 

 
   
AVIATION
 
VFR CONDITIONS WILL PREVAIL THROUGH THE NEXT COUPLE  
OF DAYS A RIDGE BUILDS TOWARD THE WEST COAST. THIS PATTERN WILL  
PROMOTE A DRY NORTHERLY FLOW ACROSS THE COAST AND INLAND AREAS.  
PERIODS OF BREEZY/GUSTY N-NW WINDS DURING THE AFTERNOON AND  
EVENING HOURS THROUGH FRIDAY ESPECIALLY ALONG THE COAST. SOME  
PATCHY AREAS OF LOW CLOUDS WILL STILL BE POSSIBLE, PRIMARILY OVER  
THE INTERIOR VALLEYS, DURING THE OVERNIGHT/EARLY MORNING HOURS.  
 

 
   
MARINE
 
HIGH PRESSURE OFFSHORE COUPLED WITH A TROUGH NEAR THE  
CALIFORNIA COAST WILL MAINTAIN FRESH TO STRONG NORTHERLY BREEZES  
AS WELL AS STEEP WAVES TODAY. NORTHERLY WINDS WILL EASE UP OVER  
THE WEEKEND, PRIMARILY NORTH OF CAPE MENDOCINO, AS A TROUGH  
APPROACHES FROM THE NW. NORTHERLY WINDS AND SEAS WILL LIKELY RAMP  
UP AGAIN AFTER THIS TROUGH PASSES OVER THE AREA. GALE FORCE  
CONDITIONS WILL BE POSSIBLE, PRIMARILY ACROSS THE SOUTHERN WATERS,  
MONDAY AND TUESDAY...SO A GALE WATCH WILL LIKELY BE NEED TO BE  
ADDED ON SATURDAY. ALSO, A MID PERIOD NW SWELL WILL CONTINUE TO  
SUBSIDE TONIGHT. ANOTHER MID PERIOD NW SWELL WILL ARRIVE OVER THE  
WEEKEND FOLLOWED BY ANOTHER SMALL NW SWELL EARLY NEXT WEEK.  
 

 
   
EKA WATCHES/WARNINGS/ADVISORIES
 
 
CA...NONE.  
NORTHWEST CALIFORNIA COASTAL WATERS...SMALL CRAFT ADVISORY UNTIL  
3 AM PDT SATURDAY FOR PZZ450-455.  
 
SMALL CRAFT ADVISORY UNTIL 9 PM PDT SATURDAY FOR PZZ470.  
 
SMALL CRAFT ADVISORY UNTIL 3 AM PDT MONDAY FOR PZZ475.  
 

 
 

 
 
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  
 
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