417
FXUS66 KEKA 072008
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
108 PM PDT MON SEP 7 2026
KEY MESSAGES
* MODERATE SNEAKER WAVE RISK CONTINUES TODAY SOUTH OF CAPE
MENDOCINO.
* MUCH ABOVE NORMAL TEMPERATURES LIKELY TUESDAY THROUGH THURSDAY,
INCLUDING ALONG THE COAST.
* LOCALLY ELEVATED FIRE DANGER FOR THE HIGHER ELEVATIONS TUESDAY
AND WEDNESDAY.
SYNOPSIS
THE MODERATE RISK OF SNEAKER WAVES CONTINUE SOUTH OF
CAPE MENDOCINO THROUGH THIS EVENING. MUCH WARMER TEMPERATURES ARE
LIKELY TUESDAY THROUGH THURSDAY, WITH WARM TEMPERATURES EVEN AT
THE COAST. COOLER TEMPERATURES RETURN LATE THIS WEEK INTO THE
WEEKEND.
DISCUSSION
GENERALLY MILD, NEAR NORMAL CONDITIONS ARE LIKELY
TODAY AS HIGH PRESSURE BEGINS TO REBUILD OVER THE AREA. INTERIOR
HIGH TEMPERATURES ARE FORECAST TO BE IN THE HIGH 80S TO LOW 90S.
COASTAL STRATUS ERODED LATE THIS MORNING BRINGING SUNNY CONDITIONS
EVEN TO THE COAST. COASTAL AREAS ARE LIKELY TO SEE HIGH
TEMPERATURES IN THE MID TO HIGH 60S.
TONIGHT, LIGHT OFFSHORE FLOW MAY KEEP COASTAL STRATUS FROM
REFORMING. THE HIGHEST CHANCES WILL BE AROUND HUMBOLDT BAY, BUT
THIS WILL LIKELY NOT BE WIDESPREAD AND PERHAPS ONLY FOR A FEW
HOURS. OFFSHORE FLOW WILL BRING WARMER LOW TEMPERATURES AS HIGH
PRESSURE AND WARMER AIR ALOFT CONTINUE TO BUILD, WITH EVEN THE
COLDEST INTERIOR VALLEYS IN THE 40S OR LOW 50S.
BUILDING HIGH PRESSURE TUESDAY THROUGH THURSDAY WILL BRING MUCH
WARMER THAN NORMAL TEMPERATURES, BOTH TO THE INTERIOR AND THE
COAST. ON TUESDAY, TEMPERATURES ARE FORECAST TO BE IN THE HIGH 80S
TO THE MID 90S FOR MOST INTERIOR VALLEYS, WHILE THE IMMEDIATE
COAST COULD BREAK 70. WEDNESDAY AND THURSDAY, THE RIDGE
STRENGTHENS, BRINGING NEAR TRIPLE DIGIT TEMPERATURES TO MOST OF
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. INTERIOR
AREAS WILL SEE WIDESPREAD MODERATE HEATRISK WHICH CORRESPONDS TO A
MODERATE RISK FOR HEAT-RELEATED 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 70S POSSIBLE AT THE IMMEDIATE COAST
AND 80S POSSIBLE JUST A FEW MILES INLAND.
SUBTROPICAL MOISTURE FROM THE REMNANTS OF HURRICANE MARIE
ARRIVING WEDNESDAY WILL COMPLICATE THE FORECAST SOMEWHAT.
INSTABILITY CONTINUES TO BE MODELED NEAR ZERO WITH A LESS THAN 5%
CHANCE FOR MUCAPE OVER 100 J/KG. STILL, CLOUD COVER COULD BRING
SLIGHTLY LOWER HIGH TEMPERATURES THAN CURRENTLY EXPECTED
WEDNESDAY, ALONG WITH A FEW VIRGA SHOWERS.
TROUGHING REBUILDS LATE THIS WEEK 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. A WEAK FRONT MOVING NORTH OF THE
AREA MAY BRING A FEW LIGHT RAIN SHOWERS TO DEL NORTE COUNTY THIS
WEEKEND, BUT CHANCES REMAIN LOW (AROUND 20%). /JB
AVIATION...(18Z TAFS)
STRATUS HAS CLEARED ALONG THE COAST AND
ONLY A FEW HIGH CLOUDS ARE BEING OBSERVED ACROSS NW CALIFORNIA.
OFFSHORE WINDS DEVELOPING OVERNIGHT IS EXPECTED TO LIMIT STRATUS
REFORMATION TONIGHT. STILL, HREF IS SHOWING AROUND 20% CHANCES
FOR IFR TO LIFR STRATUS TO FORM AROUND HUMBOLDT BAY WHICH MAY
AFFECT ACV. ANY STRATUS WILL LIKELY LIFT AND SCATTER SHORTLY AFTER
SUNRISE ON TUESDAY. OTHERWISE, VFR CONDITIONS ARE EXPECTED FOR
THE NEXT 24 HOURS. /JB
MARINE
NORTHERLY WINDS BUILD TODAY AND PEAK THIS EVENING.
NEAR-GALE FORCE GUSTS ARE POSSIBLE IN THE LEE OF CAPE BLANCO AND
CAPE MENDOCINO LATE THIS AFTERNOON AND THIS EVENING. STEEP SEAS OF
6 TO 10 FT ARE POSSIBLE WITH THESE WINDS AND MAY PROPAGATE INTO
THE NEARSHORE WATERS. BOTH WINDS AND SEAS EASE TUESDAY AS THE
PRESSURE GRADIENT WEAKENS. BREEZY NORTHERLY WINDS RETURN THURSDAY
AND ARE LIKELY TO CONTINUE SOUTH OF CAPE MENDOCINO THROUGH THE
WEEKEND. ALONG WITH WIND DRIVEN SEAS, A LONG PERIOD SOUTH SWELL
FROM HURRICANE MARIE AT AROUND 3 TO 5 FT WILL PERSIST THROUGH THE
WEEK. /JB
FIRE WEATHER
MUCH WARMER AND DRIER CONDITIONS ARE EXPECTED AS
HIGH PRESSURE REBUILDS THIS WEEK. HIGH TEMPERATURES IN THE
INTERIOR VALLEYS WILL CLIMB IN THE HIGH 90S TO JUST OVER 100
TUESDAY THROUGH THURSDAY. AFTERNOON RELATIVE HUMIDITIES WILL FALL
INTO THE TEENS OR SINGLE DIGITS IN THE EASTERN PORTIONS OF THE
AREA. OFFSHORE FLOW DEVELOPING OVERNIGHT WILL RESULT IN POOR
OVERNIGHT RECOVERIES FOR THE HIGHER ELEVATIONS AND WINDS MAY BE
LOCALLY BREEZY. NEAR-CRITICAL TO LOCALLY CRITICAL FIRE WEATHER
CONDITIONS ARE POSSIBLE IN THE HIGHEST ELEVATIONS OF DEL NORTE,
TRINITY, AND HUMBOLDT COUNTIES TUESDAY NIGHT AND EARLY WEDNESDAY
MORNING WITH THESE BREEZY WINDS. TROUGHING LATE THIS WEEK INTO THE
WEEKEND WILL RETURN COOLER TEMPERATURES AND A DEEPER MARINE
LAYER.
BEACH HAZARDS
A LONG PERIOD SOUTHERLY CONTINUES IN WATERS, ONLY
SLOWLY LOSING ENERGY THROUGH THE WEEK, BUT 15 TO 16 SECOND PERIODS
ARE STILL BEING RECORDED. THUS, THERE IS AN ONGOING RISK OF
SNEAKER WAVES TODAY FOR SOUTH FACING BEACHES IN MENDOCINO AND
SOUTHERN HUMBOLDT COUNTIES, INCLUDING THE LOST COAST TRAIL.
SNEAKER WAVES ARE A UNIQUE HAZARD, WITH UP TO 30 MINUTES BETWEEN
WAVES. LARGE, UNEXPECTED WAVES CAN SWEEP ACROSS THE BEACH WITHOUT
WARNING, SWEEPING PEOPLE INTO THE SEA FROM ROCKS, JETTIES, AND
BEACHES. THESE SNEAKER WAVES CAN ALSO MOVE LARGE OBJECTS SUCH AS
LOGS, CRUSHING ANYONE CAUGHT UNDERNEATH. EVEN ANKLE TO KNEE DEEP
WATER CAN KNOCK YOU DOWN AND DRAG YOU OUT WHEN A SNEAKER WAVE HITS.
PAY ATTENTION AND STAY ABOVE THE HIGH WATER LINE AND ANY WET SAND TO
STAY SAFE. IF THE GROUND IS WET, WAVES HAVE SURGED THERE RECENTLY.
STAY SAFE AND NEVER TURN YOUR BACK ON THE OCEAN!
EKA WATCHES/WARNINGS/ADVISORIES
CA...
BEACH HAZARDS STATEMENT UNTIL 11 PM PDT THIS EVENING FOR
CAZ104-109.
NORTHWEST CALIFORNIA COASTAL WATERS...
SMALL CRAFT ADVISORY UNTIL 6 AM PDT TUESDAY FOR PZZ455.
SMALL CRAFT ADVISORY UNTIL MIDNIGHT PDT TUESDAY NIGHT FOR
PZZ470.
SMALL CRAFT ADVISORY UNTIL 6 PM PDT TUESDAY 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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