940  
FXUS66 KEKA 232141  
AFDEKA  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE EUREKA CA  
241 PM PDT TUE JUL 23 2019  
   
SYNOPSIS
 
WARM AND DRY CONDITIONS WILL CONTINUE DURING THE  
FORESEEABLE FUTURE ACROSS THE INTERIOR. MEANWHILE, COASTAL AREAS  
WILL EXPERIENCE PERIODS OF OVERNIGHT AND MORNING MARINE CLOUDS  
FOLLOWED BY CLEARING DURING THE AFTERNOONS.  
 

 
   
DISCUSSION
 
MODEL GUIDANCE INDICATES THE UPPER HEIGHT PATTERN  
WILL EVOLVE TOWARDS A SLIGHTLY LESS AMPLIFIED CONFIGURATION  
DURING THE NEXT SEVEN DAYS. IN THE LOW-LEVELS, A THERMALLY INDUCED  
AREA OF LOWER 850 MB HEIGHTS IS FORECAST TO DEVELOP OVER THE  
ENTIRE NWRN CA COAST DURING WEDNESDAY, AND THEN REPOSITION SOUTH  
OF THE REGION DURING LATE WEEK. HOT TEMPERATURES WILL DEVELOP  
ACROSS THE INTERIOR AS A RESULT, WITH HIGHS GENERALLY IN THE MID  
90S TO AROUND 100. NEAR THE COAST, MAINLY SUNNY CONDITIONS APPEAR  
PROBABLE DURING WEDNESDAY DUE TO A SLIGHT OFFSHORE COMPONENT IN  
BOUNDARY LAYER FLOW. SUNSHINE SHOULD YIELD WARMER TEMPERATURES IN  
THE MID/UPPER 60S TO LOW 70S. AS THE 850 MB THERMAL LOW SHIFTS  
SOUTH WITH TIME, STRATUS WILL LIKELY RETURN TO THE COAST AND AID  
IN SLIGHTLY COOLER HIGHS.  
 
OTHERWISE, NO PRECIPITATION IS EXPECTED THROUGHOUT THE SHORT AND  
LONG TERM FORECAST PERIODS.  
 

 
   
AVIATION
 
A NARROW STRIP OF MARINE STRATUS PERSISTS ALONG THE  
HUMBOLDT AND DEL NORTE COUNTY COASTS TUESDAY AFTERNOON. HOWEVER,  
BOUNDARY LAYER FLOW IS FORECAST TO TAKE ON AN OFFSHORE COMPONENT  
TONIGHT WHICH SHOULD AID IN CLEARING STRATUS AWAY FROM KCEC.  
MEANWHILE, STRATUS AND IFR CEILINGS WILL BE LIKELY AT KACV LATE  
TONIGHT...BUT HERE TOO STRATUS SHOULD QUICKLY DISSIPATE LATE  
WEDNESDAY MORNING INTO THE AFTERNOON AS WARM OFFSHORE FLOW  
DEVELOPS IMMEDIATELY ABOVE THE SURFACE. FARTHER INLAND, VFR  
CONDITIONS WILL PREVAIL ACROSS THE INTERIOR DURING THE NEXT 24  
HOURS.  
 

 
   
MARINE
 
THINKING IS RELATIVELY UNCHANGED THIS AFTERNOON WITH  
REGARDS TO THE MARINE FORECAST. THE SOUTHERN OUTER WATERS WILL  
CONTINUE WITH PERSISTENT SMALL CRAFT ADVISORY CONDITIONS THROUGH  
MID WEEK. MODEL GUIDANCE ALSO INDICATES SOME STRONGER WINDS ARE  
POSSIBLE AROUND CAPE MENDOCINO AS AN EXPANSION JET DEVELOPS,  
LEADING TO GUSTS TO 35 KTS NEAR AND DOWNWIND OF THE CAPE THIS  
AFTERNOON. MOST OF THE SOUTHERN INNER WATERS WILL BE SPARED FROM  
THE JET THEREFORE HAVE HELD OFF ON ISSUING A SHORT TERM SMALL  
CRAFT ADVISORY FOR THE SOUTHERN INNER WATERS. A TIGHTENING SURFACE  
PRESSURE GRADIENT WILL AID IN INCREASING NORTHERLIES BY MID TO  
LATE WEEK ACROSS ALL OF THE WATERS, WITH OCCASIONAL GUSTS FROM 30  
TO 35 KT POSSIBLE OVER THE OUTER WATERS. IN ADDITION, STEEP  
HAZARDOUS SEAS FROM 9 TO 12 FEET WILL BE LIKELY OVER THE OUTER  
WATERS, WITH SEAS FROM 6 TO 8 FEET EXPECTED ACROSS THE NORTHERN  
INNER WATERS AS WELL AS LOCATIONS IN THE VICINITY OF CAPE  
MENDOCINO. /WCI/TDJ  
 

 
   
EKA WATCHES/WARNINGS/ADVISORIES
 
 
CA...NONE.  
NORTHWEST CALIFORNIA COASTAL WATERS...GALE WATCH FROM WEDNESDAY  
AFTERNOON THROUGH THURSDAY MORNING FOR PZZ470.  
 
SMALL CRAFT ADVISORY FROM 9 PM THIS EVENING TO 3 PM PDT  
WEDNESDAY FOR PZZ470.  
 
SMALL CRAFT ADVISORY UNTIL 3 AM PDT FRIDAY FOR PZZ475.  
 

 
 

 
 
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