815
FXUS66 KEKA 092107
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
207 PM PDT WED SEP 9 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 IN THE INTERIOR.
SYNOPSIS
MUCH WARMER TEMPERATURES ARE LIKELY TODAY AND
THURSDAY, WITH WARM TEMPERATURES EVEN AT THE COAST TODAY. 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.
DISCUSSION
HIGH PRESSURE CONTINUES TO BRING MUCH WARMER THAN
NORMAL TEMPERATURES, BOTH TO THE INTERIOR AND THE COAST. NEAR OR
SLIGHTLY ABOVE TRIPLE DIGIT TEMPERATURES ARE LIKELY FOR THE
INTERIOR VALLEYS. THIS INCLUDES VALLEYS CLOSE TO THE COAST WHICH
MAY NOT HAVE EXPERIENCED TEMPERATURES THIS HIGH SO FAR THIS YEAR,
INCLUDING GARBERVILLE AND THE EEL RIVER VALLEY. OVERNIGHT
TEMPERATURES ARE LOW ENOUGH TO PROVIDE ENOUGH COOLING AT NIGHT TO
LOWER THE HEATRISK. THIS HAS ALSO KEPT CONDITIONS BELOW ADVISORY
CRITERIA. STILL, INTERIOR AREAS WILL SEE WIDESPREAD MINOR TO
MODERATE HEATRISK WHICH CORRESPONDS TO A MODERATE RISK FOR HEAT-
RELATED ILLNESS TO THOSE WITHOUT PROPER COOLING. DRINK PLENTY OF
WATER AND STAY SAFE OUT THERE!
COASTAL AREAS ALSO CONTINUE TO WARM AS OFFSHORE FLOW CONTINUES TO
INHIBIT COASTAL STRATUS FORMATION WITH MID TO HIGH 70S POSSIBLE
AT THE IMMEDIATE COAST AND 80S POSSIBLE JUST A FEW MILES INLAND ON
WEDNESDAY. OFFSHORE FLOW WEAKENS TONIGHT INTO THURSDAY, WHICH MAY
SUPPORT MORE COASTAL STRATUS TO FORM OR MOVE ONSHORE EARLY
THURSDAY MORNING. STRATUS IS LIKELY TO CLEAR, AT LEAST PARTIALLY,
BY THE AFTERNOON AND RELATIVELY LIGHT SEA BREEZES WILL STILL
SUPPORT A PLEASANT DAY IN THE MID TO HIGH 60S.
SUBTROPICAL MOISTURE FROM THE REMNANTS OF HURRICANE MARIE
HAVE ARRIVED TODAY BRINGING HIGH CLOUD COVER OVER MENDOCINO & LAKE
THIS AFTERNOON. INSTABILITY AND MOISTURE ARE BOTH LIMITED, SO
THUNDERSTORM AND SHOWER CHANCES ARE LIMITED. HOWEVER, THE CLOUDS
ARE EXPECTED TO LIMIT THE WARMTH THIS AFTERNOON IN THE INTERIOR BY
A COUPLE DEGREES.
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...(18Z TAFS)
OFFSHORE FLOW CONTINUES TO INHIBIT
COASTAL STRATUS FORMATION. OFFSHORE WEAKENS SOMEWHAT TONIGHT WHICH
MAY ALLOW FOR STRATUS TO FORM ALONG THE COASTAL AREAS, WITH THE
HIGHEST CHANCES AROUND SUNRISE ON THURSDAY. SHOULD STRATUS FORM,
LIFR CONDITIONS ARE LIKELY WITH THE SHALLOW MARINE LAYER. ANY
CLOUDS THAT FORM ARE LIKELY TO LIFT SHORTLY AFTER SUNRISE, THOUGH
MOST MODELS DO SHOW STRATUS REMAINING JUST OFF THE COAST. /JB
MARINE
NORTHERLY WINDS AND LINGERING STEEP SEAS CONTINUE TO
EASE TODAY. 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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