758  
FXUS66 KEKA 232144  
AFDEKA  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE EUREKA CA  
244 PM PDT TUE AUG 23 2016  
   
SYNOPSIS
 
SLIGHTLY ABOVE NORMAL TEMPERATURES ACROSS THE  
INTERIOR WILL BECOME MORE SEASONAL THROUGH THE SECOND HALF OF THE  
WEEK AS AN UPPER TROUGH SLIDES OVER THE PACIFIC NORTHWEST. COASTAL  
TEMPERATURES WILL REMAIN SEASONAL YET OVERNIGHT AND MORNING  
CLOUDINESS SHOULD PERSIST OVER THE NEXT FEW DAYS WITH CLEARING  
SKIES POSSIBLE EACH AFTERNOON.  
 

 
   
DISCUSSION
 
INLAND TEMPERATURES ACROSS NORTHWESTERN CALIFORNIA  
WERE SLIGHTLY WARMER THAN NORMAL TODAY WITH SOME OF THE HOTTER  
VALLEYS INLAND APPROACHING THE UPPER 90S. COASTAL AREAS WERE MORE  
SEASONAL WITH PERSISTENT CLOUDS ACROSS THE OUTER WATERS LEAVING  
MANY PARTS OF THE IMMEDIATE COAST MOSTLY CLOUDY THROUGH THE  
MORNING HOURS. SATELLITE IMAGERY THIS AFTERNOON SHOWED THE  
STRATUS SHIFTED JUST OFFSHORE WHICH ALLOWED MUCH OF THE COAST TO  
SEE SOME BLUE SKIES. THIS COASTAL CLOUDINESS SHOULD CONTINUE OVER  
THE NEXT FEW DAYS WITH BRIEF CLEARING POSSIBLE EACH AFTERNOON.  
 
500MB HEIGHTS WILL CLIMB A FEW DECAMETERS AS RIDGING MOVES IN BEHIND  
THE EASTWARD SHIFTING TROUGH THAT IS CURRENTLY OVER THE PACIFIC  
NORTHWEST. THIS WILL CAUSE INLAND TEMPERATURES TO INCREASE BUT ONLY  
BY A FEW DEGREES. TEMPERATURES WILL DECREASE AGAIN LATE IN THE WORK  
WEEK AND EVEN FALL BELOW NORMAL VALUES BY THE WEEKEND AS THE UPPER  
TROUGH DIVES OVER THE REGION AGAIN. ALTHOUGH THE FORECAST IS  
PREDICTED TO REMAIN MOSTLY DRY THROUGH THE WEEK AHEAD, MODELS  
HINT AT SOME VERY MINIMAL PRECIPITATION OFFSHORE. THERE IS NO  
CONFIDENCE IN THIS SYSTEM IN PRODUCING WETTING PRECIPITATION FOR  
THE AREA, AT THIS TIME, BUT THIS DOES RAISE CONCERN FOR  
THUNDERSTORM POTENTIAL. UNCERTAINTY IS STILL HIGH AT THIS POINT SO  
NO STORMS WERE ADDED TO THE FORECAST. /KML  
 

 
   
AVIATION
 
SHALLOW MARINE STRATUS AND MIST CONTINUES TO  
PLAGUE THE IMMEDIATE COAST THIS AFTERNOON. WHILE CEILINGS AND  
VISIBILITIES AT THE CEC AND ACV TERMINALS HAVE IMPROVED SOMEWHAT  
THIS AFTERNOON, LIFR CEILINGS AND VISIBILITIES WILL RETURN QUICKLY  
TO BOTH LOCATIONS BY LATE AFTERNOON/EARLY EVENING AND PERSIST  
THROUGH THE NIGHT. MUCH LIKE TODAY, EXPECT WIDESPREAD STRATUS IN  
MOST LOW-LYING COASTAL AREAS TO LAST INTO THE EARLY AFTERNOON  
TOMORROW. VFR CONDITIONS WILL PERSIST AT UKI. /BRC  
 

 
   
MARINE
 
MODERATE TO PERIODICALLY STRONG NORTHERLY WINDS WILL  
PERSIST THROUGH MOST OF THE DAY THURSDAY. THIS WILL PRIMARILY APPLY  
TO THE WATERS BEYOND 10 NM OFFSHORE, AS A SOUTHERLY FLOW REVERSAL  
WILL PERSIST ACROSS THE WATERS CLOSER TO SHORE. IN THESE AREAS,  
LIGHT TO MODERATE WINDS WILL PERSIST WITH AN OVERALL SOUTHERLY  
DIRECTION, ALTHOUGH IN THE AFTERNOONS THEY WILL VEER SLIGHTLY TO THE  
WEST IN SOME AREAS. AS A RESULT, THE STEEPEST SEAS WILL REMAIN  
ACROSS THE OFFSHORE WATERS, AND IN PARTICULAR THE NORTHERN OFFSHORE  
WATERS WHERE THE STRONGEST WINDS CAN ALSO BE EXPECTED. NEAR SHORE  
AREAS CAN EXPECT AN ELEVATED FRESH SWELL TO PERSIST, ALTHOUGH NOT  
THE THE SAME HEIGHT AND STEEPNESS AS THE WATERS FARTHER FROM THE  
COAST. LOCALLY HIGHER WINDS AND SEAS CAN BE EXPECTED IN THE VICINITY  
OF PROMINENT CAPES AND POINTS SUCH AS CAPE MENDOCINO/PUNTA GORDA AND  
POINT SAINT GEORGE.  
 
ON FRIDAY, A LOW PRESSURE SYSTEM WILL HELP TO WEAKEN THE PRESSURE  
GRADIENT ACROSS THE WATERS AND PULL IT FARTHER OFFSHORE. AS THIS  
OCCURS, LIGHT TO MODERATE SOUTHERLIES WILL EXPAND IN COVERAGE AND  
EVENTUALLY OVERTAKE THE NORTHERLIES COMPLETELY WITHIN 60 NM OF  
SHORE. THIS WILL ALLOW SEAS TO SETTLE SOMEWHAT, ALTHOUGH THE BROAD  
AREA OF 15 KT SOUTHERLIES WILL LIKELY ADD IN A BIT OF SOUTHERLY  
CHOP. THESE MODEST CONDITIONS WILL PERSIST THROUGH THE WEEKEND.  
/BRC  
 

 
   
EKA WATCHES/WARNINGS/ADVISORIES
 
 
CA...NONE.  
NORTHWEST CALIFORNIA COASTAL WATERS...SMALL CRAFT ADVISORY UNTIL 11 PM PDT THURSDAY FOR PZZ470.  
 
SMALL CRAFT ADVISORY UNTIL 9 AM PDT THURSDAY FOR PZZ475.  
 

 
 

 
 
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