354  
FXUS66 KEKA 262207  
AFDEKA  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE EUREKA CA  
307 PM PDT WED APR 26 2017  
   
SYNOPSIS
 
BUILDING HIGH PRESSURE WILL CUT OFF ACCESS MOIST  
NORTHWEST FLOW WHICH SHOULD BRING AN END TO RAINFALL TONIGHT.  
EXPECT DRIER WEATHER AND WARMING TEMPERATURES OVER THE NEXT  
SEVERAL DAYS. HOWEVER...A WEAK PASSING FRONT COULD BRING A SLIGHT  
CHANCE FOR RAIN ON SUNDAY. OTHERWISE EXPECT MOSTLY DRY CONDITIONS  
INTO NEXT WEEK.  
 

 
   
DISCUSSION
 
MOIST NORTHWEST FLOW HAS BROUGHT A WETTING AND  
PERSISTENT RAIN TO THE REDWOOD COAST THROUGH MOST OF THE DAY WITH  
TOTALS RANGING FROM 0.10 INCHES OVER CAPE MENDOCINO TO MORE THAN 1  
INCH ACROSS DEL NORTE COUNTY AND JUST A FEW HUNDREDTHS REPORTED  
ELSEWHERE. THE BACK EDGE OF THE FRONT IS VISIBLE ON SATELLITE  
IMAGERY WHICH SHOULD ALLOW RAIN TO DIMINISH BY THIS EVENING,  
HOWEVER, A WEAK WAVE IN THE UPPER LEVEL FLOW COULD PROLONG NUISANCE  
RAINFALL TONIGHT INTO EARLY THURSDAY MORNING. LOW, YET UNMENTIONABLE  
POPS WERE ADDED FOR THIS TIME FRAME. CONFIDENCE IS HIGHER IN DRY  
CONDITIONS DEVELOPING BY THURSDAY AFTERNOON/EVENING AS RIDGING CUTS  
OFF THE MOISTURE. THE OVERALL TREND THIS WEEKEND INTO EARLY NEXT  
WEEK IS FOR WARMER TEMPERATURES, MOSTLY DRY WEATHER, AND EVEN SUNNY  
SKIES ACROSS NORTHWEST CALIFORNIA. ALTHOUGH, LOOKING AT PWATS  
THROUGH THE NEXT SEVERAL DAYS, THE GFS SHOWS VERY MOIST FLOW  
IMPACTING NORTHWEST CALIFORNIA SUNDAY MORNING AS WEAK WAVE SLIDES  
OVERTOP THE RIDGE. A SLIGHT CHANCE FOR SHOWERS WAS ADDED FOR SUNDAY  
BUT THE GFS AND ECMWF KEEP PRECIPITATION MAINLY NORTHWARD OF THE  
CALIFORNIA/OREGON BORDER. PWATS WILL BE QUITE HIGH ALONG THE COAST  
NEXT WEEK BUT STRONG RIDGING SHOULD KEEP CONDITIONS DRY. RATHER,  
THIS MAY SIGNAL FOR A MORE TRADITIONAL SUMMER TIME PATTERN WITH  
FRESH NORTH WINDS ACROSS THE COASTAL WATERS AND STRATUS ALONG THE  
COAST WITH MIDDAY CLEARING. /KML  
 

 
   
AVIATION
 
A COLD FRONT BROUGHT IFR/LIFR CONDITIONS TO THE  
REDWOOD COAST. LOW CIGS/VIS REALLY IMPACTED COASTAL AIRPORTS  
INTO THE AFTERNOON... ESPECIALLY CEC & ACV SITES AS THE FRONT SORT  
OF SLOWED DOWN (OR BECAME SEMI-STATIONARY). GRADUAL IMPROVING  
CONDITIONS THROUGH THE FIRST HALF OF THE PERIOD AS A LOT OF  
CLOUDS/MOISTURE WILL CONTINUE LINGERING ACROSS THE REGION. THIS  
WILL RESULT IN WIDESPREAD MVFR CONDITIONS INTO THE EVENING.  
 
INLAND AREAS HAD BETTER CONDITIONS ALTHOUGH MVFR SKIES PREVAILED  
WITH NOMINAL RAIN AMOUNTS INTO EARLY AFTERNOON...MAINLY AREAS SOUTH  
OF CAPE MENDOCINO. THE TAIL END OF THE FORECAST PERIOD WILL RENDER  
WIDESPREAD DRYING AND A LITTLE WARMER TEMPERATURES.  
TA  
 

 
   
MARINE
 
LITTLE TO NO CHANGES WERE MADE TO THE PREVIOUS FORECAST  
PACKAGE. FORECAST IS STILL ON TRACK. UTILIZED GFS IN REFRESHING  
THE WIND FORECASTS. WINDS HAVE SHIFTED FROM SOUTH TO NORTHWEST  
TODAY, AND THE NORTHERLY WINDS WILL INTENSIFY THIS EVENING. WIND  
GUSTS SHOULD BE AROUND 25 TO 30 KT FOR THE SOUTHERN WATERS. BY  
THURSDAY EVENING, NORTHERLY WINDS OF 10 TO 20 KT WITH GUSTS TO 30  
KT WILL BE COMMONPLACE ACROSS ALL OF THE WATERS. THE NORTHERLY  
WINDS WILL PERSIST THROUGH THE WEEKEND INTO NEXT WEEK AS THE EAST  
PACIFIC HIGH ESTABLISHES ITSELF OVER THE AREA.  
 
WE WILL HAVE A MID-PERIOD WESTERLY SWELL THROUGH THE FORECAST  
PERIOD, AND ALSO A LONG-PERIOD SOUTHERLY SWELL IN THE BACKGROUND.  
THE NORTHERLY WIND WAVE WILL BECOME SIGNIFICANT ON THURSDAY AND  
CONTINUE THROUGH THE END OF THE FORECAST PERIOD. WE WILL HAVE SEAS  
OF 7 TO 8 FEET WITH WAVE PERIOD OF 7 TO 8 SECONDS, WHICH IS FAIRLY  
STEEP.  
 

 
   
EKA WATCHES/WARNINGS/ADVISORIES
 
 
CA...NONE.  
NORTHWEST CALIFORNIA COASTAL WATERS...SMALL CRAFT ADVISORY FROM 6 PM THURSDAY TO 3 AM PDT SATURDAY FOR  
PZZ450-470.  
 
SMALL CRAFT ADVISORY FROM 9 PM THIS EVENING TO 3 AM PDT SATURDAY  
FOR PZZ455-475.  
 

 
 

 
 
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