987  
FXUS66 KEKA 090704  
AFDEKA  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE EUREKA CA  
1204 AM PDT WED JUL 9 2025  
   
SYNOPSIS
 
NEAR OR SLIGHTLY BELOW NORMAL TEMPERATURES ARE  
EXPECTED AGAIN WEDNESDAY. WARMING IS EXPECTED AGAIN THURSDAY WITH  
ADDITIONAL WARMING FRIDAY AND HOT WEATHER CONTINUING INTO EARLY  
NEXT WEEK.  
 

 
   
DISCUSSION
 
THE CENTER OF THE UPPER LOW CURRENTLY MOVES OVER THE  
AREA. THIS HAS THE POTENTIAL TO BRING SOME THUNDERSTORMS TO THE  
AREA. THE MODELS AREN'T EXPLICITLY OUTPUTTING THUNDERSTORMS, BUT  
THERE IS SOME ELEVATED INSTABILITY. THIS, COMBINED WITH THE DYNAMICS  
OF THE LOW AND STEEP LAPSE RATES ALOFT MAY BRING SOME NOCTURNAL  
THUNDERSTORMS.  
 
WEDNESDAY DURING THE DAY THE UPPER LEVEL LOW IS EXPECTED TO MOVE OFF  
TO THE EAST AND WE WILL BE IN NORTHWEST FLOW. IT LOOKS LIKE THE  
THREAT FOR THUNDERSTORMS WILL DIMINISH THROUGH THE DAY LIGHT HOURS  
ON WEDNESDAY.  
 
WEDNESDAY NIGHT INTO THURSDAY MORNING OFFSHORE FLOW IS EXPECTED IN  
HUMBOLDT AND DEL NORTE COUNTIES. THIS SHOULD DIMINISH THE MARINE  
LAYER AND ALLOW SKIES TO CLEAR. THURSDAY IS EXPECTED TO BE THE  
TRANSITION DAY WITH WARMER TEMPERATURES, BUT HIGHS ARE EXPECTED TO  
REMAIN IN THE 90S IN MOST INLAND AREAS WITH LOW TO MID 60S POSSIBLE  
ALONG THE COAST. FRIDAY ADDITIONAL WARMING IS EXPECTED WITH HIGHS  
CLIMBING OVER 100 IN MANY OF THE VALLEYS. THE COAST MAY SEE HIGHS IN  
THE MIDDLE TO UPPER 60S WITH CONTINUED OFFSHORE FLOW. THIS IS  
EXPECTED TO BRING MODERATE TO MAJOR HEAT RISK TO MANY OF THE AREAS.  
THIS HEAT IS EXPECTED TO PERSIST THROUGH THE WEEKEND IN SOME OF THE  
INTERIOR AREAS. A HEAT ADVISORY MAY BE NEEDED IN SOME OF THE MORE  
PERSISTENTLY HOT AREAS. THERE IS SOME UNCERTAINTY ON HOW MUCH THE  
VALLEYS WILL COOL OFF AT NIGHT AND THAT COULD MITIGATE THE IMPACT OF  
THE HEAT. MKK  
 

 
   
AVIATION
 
MOSTLY IFR CONDITIONS ARE EXPECTED ALONG THE NORTH COAST  
INTO WEDNESDAY MORNING. THE UPPER LOW SPINNING OVER HEAD HAS  
AIDED IN THE DEEPENING OF THE MARINE LAYER, AS WELL. WITH  
SOUTHERLY FLOW UP THE RUSSIAN RIVER VALLEY, THERE IS A POSSIBILITY  
OF MVFR CEILINGS FOR KUKI A FEW HOURS BEFORE SUNRISE WEDNESDAY.  
THERE APPEARS TO BE LITTLE CHANCE FOR CLEARING THROUGH THE DAY  
WEDNESDAY FOR COASTAL TERMINALS WITH CEILINGS MOST LIKELY LIFTING  
INTO MVFR RANGE BY THE AFTERNOON. /JLW  
 

 
   
MARINE
 
LIGHT WINDS AND LOW SEAS ARE CURRENTLY DOMINATING THE  
MARINE ENVIRONMENT AS AN UPPER LOW SPINS OVER THE COASTAL WATERS.  
THIS LOW WILL MOVE INLAND WEDNESDAY ALLOWING SURFACE HIGH PRESSURE  
TO RE-BUILD TOWARD THE NORTHWEST CALIFORNIA COAST OVER THE EASTERN  
PACIFIC. THIS WILL ENHANCE THE PRESSURE GRADIENT AND ONCE AGAIN  
STRENGTHEN THE NORTHERLIES. NEAR GALE TO GALE WIND GUSTS ARE  
POSSIBLE THURSDAY THROUGH SATURDAY, MOST LIKELY OVER THE OUTER WATER  
ZONES, PULLING INTO JUST THE NORTHERN WATERS THIS WEEKEND AS THE  
THERMAL TROUGH BUILDS NORTH OVER LAND. STEEP SHORT PERIOD SEAS WILL  
BUILD IN RESPONSE TO THE GALE NORTHERLIES. /RPA  
 

 
   
FIRE WEATHER
 
HIGH TEMPERATURES IN THE 80'S AND 90'S ARE EXPECTED  
FOR MOST OF THE INTERIOR ON WEDNESDAY. THE MARINE LAYER IS EXPECTED  
TO REMAIN DEEPER THROUGH WEDNESDAY MORNING AS AN UPPER-LOW MOVES  
PAST THE AREA, BRINGING SLIGHTLY HIGHER AFTERNOON RHS. AS THIS UPPER  
LOW MOVES OVERHEAD THERE IS THE POTENTIAL FOR THUNDERSTORMS TO MOVE  
ACROSS HUMBOLDT, DEL NORTE AND TRINITY COUNTIES EARLY WEDNESDAY, YET  
AS OF WRITING THIS NO STORMS HAVE BEEN SEEN VIA SATELLITE/RADAR.  
CONFIDENCE ON THESE STORMS MANIFESTING REMAINS LOW AND THE BETTER  
CHANCE FOR THUNDERSTORMS REMAINS TO THE NORTH OF THE AREA, WITH  
STORMS SEEN OVER NE OREGON. OVERNIGHT RECOVERIES GENERALLY REMAIN  
GOOD ASIDE FROM THE EXPOSED RIDGES IN THE THERMAL BELT.  
 
MUCH HOTTER TEMPERATURES AND DRIER HUMIDITY ARE LIKELY IN THE  
INTERIOR LATE THIS WEEK. THURSDAY AND FRIDAY MORNINGS OFFSHORE FLOW  
WILL BRING POOR RECOVERIES TO THE HIGHER ELEVATIONS AND MAY PUSH THE  
STRATUS OFF THE COAST. TRIPLE DIGIT TEMPERATURES ARE LIKELY IN MOST  
OF THE INTERIOR VALLEYS BY FRIDAY WITH VERY LOW AFTERNOON RHS AND  
MODERATE OVERNIGHT RECOVERIES. JB  
 

 
   
EKA WATCHES/WARNINGS/ADVISORIES
 
 
CA...  
NONE.  
NORTHWEST CALIFORNIA COASTAL WATERS...  
SMALL CRAFT ADVISORY FROM 3 AM TO 11 AM PDT THURSDAY FOR  
PZZ455-470.  
 
GALE WATCH FROM THURSDAY MORNING THROUGH THURSDAY EVENING  
FOR PZZ455-470-475.  
 
SMALL CRAFT ADVISORY FROM 9 PM THIS EVENING TO 11 AM PDT  
THURSDAY FOR PZZ475.  
 

 
 

 
 
NOTE: THE FULL FORECAST DISCUSSION IS NOW REGULARLY ISSUED BETWEEN  
10 AM/PM AND 1 PM/AM. ADDITIONAL UPDATES WILL BE ISSUED AS NEEDED.  
 
VISIT US AT HTTPS://WWW.WEATHER.GOV/EUREKA  
 
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FOR FORECAST ZONE INFORMATION  
SEE THE FORECAST ZONE MAP ONLINE:  
HTTPS://WWW.WEATHER.GOV/IMAGES/EKA/ZONEMAP.PNG  
 
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