335
FXUS66 KEKA 070717
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
1217 AM PDT FRI AUG 7 2026
KEY MESSAGES
* MODERATE TO MAJOR HEAT RISK CONTINUES THROUGH THE WEEKEND FOR
MUCH OF THE INTERIOR PEAKING ON SATURDAY IN MOST AREAS.
* TEMPERATURES DIMINISH SLIGHTLY NEXT WEEK, BUT MOST AREAS REMAIN
THE UPPER 90S TO AROUND 100 THROUGH MID-WEEK.
* INCREASED WINDS AND LOW RELATIVE HUMIDITY WILL ELEVATE FIRE
DANGER THIS WEEKEND.
* COASTAL STRATUS TO CONTINUE FOR MUCH OF THE NORTH COAST FRIDAY
WITH BETTER CHANCES FOR AFTERNOON CLEARING OVER THE WEEKEND.
SYNOPSIS
PERSISTENT HIGH PRESSURE ALOFT WILL REMAIN THROUGH
THE WEEKEND. INLAND AREAS CONTINUE TO SEE ABOVE NORMAL
TEMPERATURES THROUGH THE WEEKEND BRINGING MODERATE TO MAJOR HEAT
RISK. COASTAL AREAS WILL REMAIN MOSTLY OVERCAST FRIDAY WITH
BETTER CHANCES OF CLEARING OVER THE WEEKEND.
DISCUSSION
A STEADY RIDGE OF HIGH PRESSURE REMAINS ENTRENCHED
OVER THE WEST COAST LEADING TO WARM TO VERY HOT TEMPERATURES FOR
THE INLAND AREAS. MOST INLAND VALLEYS CAN EXPECT HIGH TEMPERATURES
BETWEEN 100-110F THROUGH THE WEEKEND. THE COAST CONTINUES TO
OFFER SOME RELIEF FROM THIS HEAT. OFFSHORE STRATUS IS BLANKETING
MUCH OF THE WESTERN SEABOARD FROM THE MEXICAN BOARDER UP THROUGH
OREGON. TEMPERATURES WILL STRUGGLE TO REACH 65F FOR COASTAL
COMMUNITIES DUE TO THIS COMPRESSED MARINE LAYER. HOWEVER, ABOVE
AVERAGE SSTS WILL LIMIT THE LIKELIHOOD OF ANY TRUE DAYTIME FOG.
SOME WARMING IS EXPECTED FRIDAY AND SATURDAY ACROSS THE INTERIOR
INCREASING THE HEATRISK WITH MODERATE TO MAJOR HEATRISK NOW BEING
INDICATED. THE HEAT IS EXPECTED TO PEAK ON SATURDAY, PARTICULARLY
OVER LAKE COUNTY, WHERE CONDITIONS ARE ON THE EDGE OF WARRANTING AN
EXCESSIVE HEAT WARNING INSTEAD OF ONLY AN ADVISORY. REGARDLESS, THIS
PERSISTENT HEAT WILL BE DANGEROUS FOR ANYONE WORKING OUTSIDE AND
EVERYONE IN THE INTERIOR PORTIONS OF ALL OF NORTHERN CALIFORNIA
SHOULD BE DRINKING PLENTY OF FLUIDS AND TAKING BREAKS TO AVOID
HEAT STROKE.
A COUPLE PASSING SHORTWAVES ON THE NORTHERN PERIPHERY OF THE RIDGE
WILL TIGHTEN THE PRESSURE GRADIENT OVER THE REGION ALLOWING FOR A
STRONGER ONSHORE SEA BREEZE EACH AFTERNOON AND EVENING. WITH VERY
DRY CONDITIONS ACROSS THE INTERIOR THIS WILL RESULT IN INCREASE FIRE
WEATHER CONCERNS. FOR MORE DETAILS, SEE THE FIRE WEATHER SECTION
BELOW.
THE RIDGE WILL FINALLY SEE SOME WEAKENING EARLY NEXT WEEK AS A WEAK
TROUGH SETTLES OVER THE WEST COAST. THIS SHOULD ALLOW TEMPERATURES
TO COOL SEVERAL DEGREES BACK TO AROUND NORMAL FOR THIS TIME OF YEAR.
/RPA
AVIATION
STRATUS RETURNS OVERNIGHT INTO FRIDAY WITH COASTAL
TERMINALS ALREADY SHOWING REDUCED FLIGHT CATEGORIES FOR MOST OF
THE DAY THURSDAY. ALTHOUGH THERE WERE A FEW HOURS OF IFR DURING
THE DAY THURSDAY, LIFR WILL BE THE DOMINANT CATEGORY INTO LATE
THURSDAY NIGHT/FRIDAY MORNING. THE TRANSITIONING PATTERN WILL
BRING NORTHERLY WINDS BACK INTO PLAY, STRONGER WINDS ARE EXPECTED
OVER THE WEEKEND WHICH COULD BRING CONCERNS FOR LLWS. OTHERWISE,
THE VISIBILITY MAY NOT BE AS SEVERE AS THE PREVIOUS NIGHT AS THE
SYNOPTIC PATTERN TRANSITIONS. STAY TUNED AS CONDITIONS DEVELOP.
/EYS
MARINE
LIGHT TO MODERATE NORTHERLY WINDS ARE IN PLACE OVER MOST
OF THE COASTAL WATERS AT THIS TIME WITH ONLY A FEW LIGHT SOUTHERLY
WINDS PERSISTING ALONG THE NORTHERN HUMBOLDT AND DEL NORTE COASTS.
FRIDAY AND INTO THE WEEKEND, A MORE UNIFORM REGIME OF NORTHERLY
WINDS ARE FORECAST TO RETURN TO THE AREA. GALES ARE POSSIBLE OVER
THE WEEKEND INTO EARLY NEXT WEEK WITH THE LIKELIHOOD OF GUSTS >30KTS
OVER 80% FOR MOST OF THE OUTER WATERS FROM SATURDAY THROUGH MOST OF
NEXT WEEK. VERY STEEP SEAS WILL BUILD IN RESPONSE TO THIS INCREASING
WINDS AND GALE WATCHES HAVE BEEN ISSUED FOR THE OUTER WATER ZONES
FOR PORTIONS OF THE WEEKEND.
FIRE WEATHER
CONDITIONS ARE EXPECTED TO REMAIN HOT AND DRY
THROUGH THROUGH THE WEEKEND. THIS HEAT WAVE WILL LIKELY CAUSE AN
INCREASE IN FIRE RISK AS THE FUELS DRY. THIS WEEKEND, THE SYNOPTIC
WEATHER PATTERN IS LIKELY TO CHANGE EVER SO SLIGHTLY. THIS CHANGE
WILL BE FELT BY AN INCREASE IN THE LIKELIHOOD OF STRONGER VALLEY
WINDS EACH AFTERNOON. THE PRIMARY AREAS OF CONCERN ARE IN THE
EASTERN TRINITY RIVER VALLEY AND ON THE EASTERN SIDE OF CLEAR LAKE
IN LAKE COUNTY. THE DURATION OF THE STRONGER WESTERLIES EACH
AFTERNOON SHOULD BE LIMITED TO LESS THAN THE REQUIRED 8 HOURS FOR
RED FLAG WARNINGS. THUS, NO FIRE WEATHER WATCH BEEN ISSUED AT THIS
TIME BUT A HEADLINE HAS BEEN INTRODUCED INTO THE FIRE WEATHER
FORECAST PRODUCT.
BEACH HAZARDS
SEA LEVELS CONTINUE TO RUN APPROXIMATELY 0.8 FT
ABOVE THE PREDICTED TIDE LEVEL IN HUMBOLDT BAY. TIDES WILL BECOME
MORE AMPLIFIED EARLY NEXT WEEK FOLLOWING THE NORMAL LUNAR CYCLE.
THE PREDICTED TIDE AT THE NORTH SPIT IS 7.95 FT MLLW AT 10:21 PM
ON MONDAY THE 10TH AND THEN 7.99 FT MLLW AT 11:17 PM ON TUESDAY
THE 11TH. IF THE TIDE CONTINUES TO RUN AT AROUND 0.8 FT ABOVE
PREDICTED, THIS COULD RESULT IN MINOR COASTAL FLOODING AROUND
HUMBOLDT BAY WITH MINOR IMPACTS IN KING SALMON AND POSSIBLY A FEW
OTHER LOCATIONS AROUND THE BAY.
EKA WATCHES/WARNINGS/ADVISORIES
CA...
HEAT ADVISORY UNTIL 11 PM PDT THIS EVENING FOR CAZ105-106.
HEAT ADVISORY UNTIL 10 PM PDT SUNDAY FOR CAZ108-116-117.
HEAT ADVISORY FROM 11 AM FRIDAY TO 10 PM PDT SUNDAY FOR
CAZ110-111-113-114-118>120.
HEAT ADVISORY FROM 10 AM SATURDAY TO 10 PM PDT SUNDAY FOR
CAZ112.
NORTHWEST CALIFORNIA COASTAL WATERS...
SMALL CRAFT ADVISORY FROM 5 PM FRIDAY TO 3 PM PDT SATURDAY
FOR PZZ470.
GALE WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY MORNING
FOR PZZ470-475.
SMALL CRAFT ADVISORY FROM 3 AM FRIDAY TO 3 PM PDT SATURDAY
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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