388
FXUS66 KEKA 050744
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
1244 AM PDT WED AUG 5 2026
KEY MESSAGES
-MODERATE TO MAJOR HEAT RISK CONTINUES THROUGH THE WEEK FOR MUCH OF
THE INTERIOR.
-SURFACE SMOKE IS POSSIBLE ALONG THE NORTH COAST DUE TO WIND
TRAVELING DOWN FROM OREGON TODAY.
SYNOPSIS
PERSISTENT HIGH PRESSURE ALOFT WILL REMAIN THROUGH
THE WEEK. INLAND AREAS ARE SUBJECT TO ABNORMALLY HOT TEMPERATURES
OF THROUGH THE WEEK. OFFSHORE WINDS IN OREGON WILL TRANSPORT
WILDFIRE SMOKE TO THE COASTAL WATERS, POTENTIALLY ARRIVING TO THE
NORTH COAST THIS EVENING.
DISCUSSION
A STEADY RIDGE OF HIGH PRESSURE CONTINUES TO IMPACT
THE WEST THIS WEEK LEADING TO WARM TO VERY HOT TEMPERATURES FOR THE
INLAND AREAS. MOST INLAND VALLEYS CAN EXPECT HIGH TEMPERATURES
BETWEEN 100-110DEG F THROUGH THE WORK WEEK. THE COAST CONTINUES TO
OFFER SOME RELIEF FROM THIS HEAT. OFFSHORE STRATUS BROKE THE
STREAK OF 67 DEGREE DAYS IN EUREKA, WITH THE HIGH TEMPERATURE AT
WOODLEY ISLAND ONLY REACHING 66. AREAS SLIGHTLY INLAND DID STILL
REACH THE 70S, HOWEVER.
A COASTAL EDDY DIVERTED MUCH OF THE SMOKE AWAY FROM THE NORTH
COAST ON TUESDAY. THIS EDDY HAS ENHANCED FURTHER EARLY THIS
MORNING KEEPING A MAJORITY OF SMOKE OFF THE COAST WHILE ALSO
INCREASING LOW CLOUD COVERAGE. SMOKE MODELS DO SHOW SMOKE POOLING
IN INTERIOR DEL NORTE, EARLY THIS MORNING WITH CLEARING LIKELY
THIS AFTERNOON.
THE WEATHER PATTERN WILL HAVE MINIMAL CHANGES THROUGH THE WEEK AS
THIS HIGH PRESSURE IS EXPECTED TO REMAIN OVERHEAD. A SLIGHT CHANGE
IN WEATHER IS POSSIBLE THIS WEEKEND. CLUSTER AND DETERMINISTIC
GLOBAL MODEL ANALYSIS SHOWS THIS HIGH PRESSURE RIDGE BEGINNING TO
WEAKEN THROUGH THE WEEKEND LEADING TO ZONAL OR EVEN SLIGHT UPPER
LEVEL TROUGHING ENTERING NEXT WEEK. UNTIL THEN HOWEVER, EXPECT
WARM INTERIOR TEMPERATURES AND FOGGY NIGHTTIME HOURS ALONG THE
COAST.
AVIATION
LIGHT SOUTHERLY WINDS OVERNIGHT ARE ENCOURAGING
OFFSHORE STRATUS AS A DISTINCT EDDIE, SOUTH OF CAPE MENDOCINO,
SLINGS LOW LEVEL STRATIFORM TOWARDS THE COAST. JUST BEFORE SUNSET,
VISIBLE SATELLITE SHOWED DENSE STRATUS OFFSHORE OF MENDOCINO.
NIGHT FOG PRODUCT IS SHOWING THE SAME MASS CREEPING UP THE COAST
TOWARDS THE NORTHERN HUMBOLDT AND DEL NORTE COASTLINES. EXPECT
LIFR CATEGORIES OVERNIGHT INTO WEDNESDAY. NEARBY, FIRES ARE
PRODUCING CONSIDERABLE SMOKE THAT IS SETTLING INTO THE AREAS. ASOS
AT THE TERMINALS HAVE BEEN PICKING UP HZ AND EXPECT THIS TO
CONTINUE TO DEGRADE VISIBILITY INTO WEDNESDAY. /EYS
MARINE
GENERALLY LIGHT WINDS HAVE RETURNED TO THE WATERS, WITH
A SOUTHERLY BREEZE OF UP TO 10 TO 15 KTS BEING OBSERVED NEAR THE
COAST. LOCAL AREAS OF 25 KT NEAR THE CAPES. GENERALLY LIGHT
SOUTHERLY WINDS AND DECREASING NORTHERLY WAVES ARE EXPECTED ON
WEDNESDAY AND THURSDAY AS WELL. FRIDAY AND INTO THE WEEKEND
NORTHERLY WINDS ARE EXPECTED TO RETURN TO THE AREA. GALES ARE
POSSIBLE OVER THE WEEKEND INTO EARLY NEXT WEEK.
FIRE WEATHER
LIGHT, OFFSHORE FLOW ALOFT WEAKENS EARLY THIS
MORNING. AFTERNOON RH VALUES ARE EXPECTED TO DIP INTO THE LOW
TEENS OR SINGLE DIGITS THIS AFTERNOON. TERRAIN FOCUSED WINDS ARE
EXPECTED WITH UPVALLEY FLOW FOR MOST OF THE RIVER VALLEYS MIXING
WITH SOUTHERLY WINDS.
EKA WATCHES/WARNINGS/ADVISORIES
CA...
HEAT ADVISORY UNTIL 11 PM PDT THIS EVENING FOR CAZ102-110-
111-113-114-118>120.
HEAT ADVISORY UNTIL 11 PM PDT THURSDAY FOR CAZ105-106-108-
116-117.
NORTHWEST CALIFORNIA COASTAL WATERS...
SMALL CRAFT ADVISORY UNTIL 9 AM PDT WEDNESDAY FOR PZZ470.
SMALL CRAFT ADVISORY UNTIL 3 AM PDT WEDNESDAY 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.
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