614
FXUS66 KEKA 100938
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
238 AM PDT THU SEP 10 2026
KEY MESSAGES
* ABOVE NORMAL INTERIOR TEMPERATURES LIKELY THROUGH THURSDAY.
* CHANCES FOR LIGHT RAINFALL FOR DEL NORTE AND NORTHERN HUMBOLDT
SATURDAY.
* LOCALLY ELEVATED FIRE DANGER THURSDAY, FRIDAY, & SATURDAY
AFTERNOONS FOR THE INTERIOR.
SYNOPSIS
COOLER TEMPERATURES RETURN TO THE COAST THURSDAY AND
ACROSS THE AREA FRIDAY INTO THE WEEKEND. LIGHT RAIN IS POSSIBLE
FOR THE NORTHERN HALF OF THE AREA SATURDAY. WESTERLY TO
NORTHWESTERLY WINDS WILL INCREASE THE FIRE RISK FOR THE INTERIOR
THROUGH SATURDAY.
DISCUSSION
THE ONCE STRONG RIDGE OF HIGH PRESSURE IS WEAKENING
AS TROUGHING BEGINS TO ASCEND IN FROM THE NORTH. TEMPERATURES WILL
BEGIN TO LOWER AS QUICKLY AS THEY INCREASED, WITH HIGH TEMPERATURES
OVER 10 DEGREES COOLER BY FRIDAY. THE RETURN OF SURFACE MOISTURE
AND WEAKENED OFFSHORE FLOW HAS ALLOWED FOR COASTAL STRATUS TO
REFORM. LEVELS ARE SHALLOW, AND SOME AREAS OF FOG ARE LIKELY. THE
STRATUS MAY BE SOMEWHAT PERSISTENT AROUND PORTIONS OF THE COAST
TODAY. THE ADDITION OF CLOUDCOVER MAY FURTHER COOL THE DAYTIME
HIGHS AT THE COAST TODAY.
SUBTROPICAL MOISTURE FROM THE REMNANTS OF HURRICANE MARIE ARRIVED
WEDNESDAY, BRINGING SOME HIGH CLOUDS AND VIRGA SHOWERS. THE
MOISTURE AND WEAK PERTURBATION WILL PULL EASTWARD TODAY, PERHAPS
ALLOWING FOR A COUPLE ISOLATED VIRGA SHOWERS ON THE WAY OUT.
TROUGHING REBUILDS FRIDAY INTO THE WEEKEND, RETURNING NEAR NORMAL
TEMPERATURES AND COASTAL STRATUS BY FRIDAY. BY THIS WEEKEND, MUCH
OF THE INTERIOR IS FORECAST TO BE IN THE 70S AND 80S WITH THE
COAST IN THE LOW 60S. LIGHT RAIN IS BECOMING LIKELIER FOR THE
NORTHERN PORTIONS OF THE AREA, WITH DEL NORTE HAVING AN 80% CHANCE
OF ANY MEASURABLE RAIN, AND NORTHERN HUMBOLDT UP TO A 40% CHANCE.
WETTING RAIN (OVER 0.1") CHANCES REMAIN LOW AT AROUND 40% IN DEL
NORTE AND 20 TO 30% CHANCES IN NORTHERN HUMBOLDT. /JB
AVIATION
OFFSHORE FLOW WEAKENED WHICH ALLOWED FOR STRATUS TO
FORM ALONG THE COASTAL AREAS. CHANCES FOR THE STRATUS STARTS
NORTH ALONG THE DEL NORTE COAST AFTER 11Z, FOLLOWED BY PROGRESSION
SOUTHWARD INTO SUNRISE THURSDAY. LIFR CONDITIONS ARE LIKELY WITH
THE SHALLOW MARINE LAYER, ALONG WITH FOG. THE FOG AND COASTAL
STRATUS MAY PROVE TO BE PERSISTENT THURSDAY WITH A WEAK COASTAL
EDDY MODELED TO FORM. THE STRATUS WILL FILL BACK IN WITH FULL
FORCE LATE THURSDAY. THE INTERIOR WILL REMAIN VFR OTHER THAN SOME
AREAS OF PATCH GROUND FOG THROUGH THE EARLY MORNING HOURS. WINDS
WILL STAY LIGHT CLOSER TO THE COAST, BUT AFTERNOON NORTHWEST WINDS
WILL TURN BREEZIER OVER UKI AND SOUTH THROUGH LAKE COUNTY.
MARINE
BREEZY NORTHERLY WINDS RETURN THURSDAY, PARTICULARLY
IN THE LEE OF CAPE MENDOCINO. NEAR GALE FORCE GUSTS ARE POSSIBLE
BY THURSDAY EVENING IN THE LEE OF CAPE MENDOCINO AND CAPE BLANCO.
WINDS EASE FRIDAY AND SATURDAY AS A WEAK FRONT MOVES THROUGH THE
AREA. STRONG NORTHERLIES RETURN SUNDAY. ALONG WITH WIND DRIVEN
SEAS, A LONG PERIOD SOUTH SWELL FROM HURRICANE MARIE AT AROUND 2
TO 3 FT CONTINUES THROUGH THE WATERS. /JB
FIRE WEATHER
MUCH WARMER AND DRIER CONDITIONS CONTINUE THROUGH
THURSDAY. AFTERNOON RELATIVE HUMIDITY WILL BE VERY LOW IN THE
INTERIOR WITH MOST AREAS SEEING SINGLE DIGITS AND TEENS. TONIGHT,
OFFSHORE WINDS WEAKEN SOMEWHAT WHICH WILL SUPPORT THE
REDEVELOPMENT OF A SHALLOW MARINE LAYER AND SLIGHTLY IMPROVED
RELATIVE HUMIDITY RECOVERIES. BREEZY ONSHORE WINDS RETURN THURSDAY
AFTERNOON AND WILL ELEVATE FIRE WEATHER CONCERNS AS RELATIVE
HUMIDITIES REMAIN LOW. THE WINDS WILL BE STRONGEST, AND THE FIRE
DANGER HIGHEST IN LAKE COUNTY AND EASTERN TRINITY COUNTY WITH
THESE WINDS MAINLY IN THE AFTERNOON AND LATE EVENING. LOCALLY
CRITICAL CONDITIONS ARE POSSIBLE.
TROUGHING LATE THIS WEEK INTO THE WEEKEND WILL RETURN COOLER
TEMPERATURES AND A DEEPER MARINE LAYER. AFTERNOON WESTERLY TO
NORTHWESTERLY WINDS WILL INCREASE FRIDAY AND SATURDAY. THE
LARGEST AREAS OF CONCERN WILL BE THE SOUTHERN PORTIONS OF THE AREA,
SUCH AS LAKE COUNTY, THAT WILL REMAIN DRY.
EKA WATCHES/WARNINGS/ADVISORIES
CA...
NONE.
NORTHWEST CALIFORNIA COASTAL WATERS...
SMALL CRAFT ADVISORY FROM NOON THURSDAY TO 3 PM PDT FRIDAY
FOR PZZ470.
SMALL CRAFT ADVISORY FROM NOON THURSDAY TO 3 AM 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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