850
FXUS66 KEKA 122207
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
307 PM PDT MON APR 12 2021
SYNOPSIS
GUSTY NORTHERLY WINDS WILL CONTINUE ALONG THE COAST
EACH AFTERNOON AND EVENING TODAY AND TUESDAY. OTHERWISE, MOSTLY
CLEAR SKIES WITH COOL NIGHTS AND MILD TO WARM DAYS ARE EXPECTED.
DISCUSSION
HIGH PRESSURE AND OFFSHORE FLOW CONTINUES TO BRING
CLEAR SKIES AND DRY CONDITIONS TO THE REGION. AS THE WEEK
PROGRESSES, AN UPPER LEVEL LOW DROPS INTO EASTERN OREGON
WEAKENING THE PRESSURE GRADIENT. EARLY TUESDAY MORNING THE HREF,
AND TO A LESSER EXTEND THE NBM, IS SHOWING SOME STRATUS DEVELOPING
IN THE EEL RIVER DELTA AND AROUND HUMBOLDT BAY. THIS SEEMS
REASONABLE WITH THE LIGHTER WINDS AND MORE NORTHERLY FLOW. DRY
CONDITIONS AND MAINLY CLEAR SKIES ARE EXPECTED TO CONTINUE WITH
THIS VERY DRY WEATHER SYSTEM. THE MOST NOTABLE CHANGE WILL BE
TEMPERATURES 5 TO 10 DEGREES COOLER ACROSS THE INTERIOR AREAS.
WINDS WILL INCREASE ACROSS THE INTERIOR IN THE AFTERNOON. THE
COASTAL AREAS MAY ACTUALLY INCREASE A FEW DEGREES AS THE OFFSHORE
FLOW PICKS UP THROUGH THE DAY. MOSTLY CLEAR SKIES AND DRY
CONDITIONS ARE EXPECTED TO CONTINUE.
TUESDAY NIGHT INTO WEDNESDAY MORNING NORTHEASTERLY WINDS
(OFFSHORE FLOW) CONTINUE TO INCREASE. THIS WILL BE MOST NOTABLE
ON THE RIDGES NEAR THE COAST AND IN SOUTHEASTERN LAKE COUNTY.
GUSTS OF 20 TO 30 MPH WILL BE POSSIBLE ON THE RIDGES. POOR RH
RECOVERIES ARE EXPECTED DURING THIS TIME. THIS WILL ELEVATE FIRE
WEATHER DANGER IN SOUTHEASTERN LAKE COUNTY.
WEDNESDAY AND THURSDAY THE UPPER LEVEL SLOWLY MOVES OFF TO THE
AND SLOWLY WEAKENS. THIS WILL DIMINISH THE WINDS, ALTHOUGH INLAND
TEMPERATURES WILL REMAIN IN THE UPPER 60S TO LOW 70S. AT THE
COAST THE LIGHTER WINDS COULD BRING SOME STRATUS AS EARLY AS
THURSDAY MORNING AS THE OFFSHORE FLOW WEAKENS. THIS MAY NEED TO BE
ADDED TO THE FORECAST ONCE IT GETS CLOSER.
LATE IN THE WEEK AND INTO THE WEEKEND HIGH PRESSURE IS EXPECTED TO
BUILD INTO THE AREA. THIS WILL GRADUALLY INCREASE TEMPERATURES
THURSDAY THROUGH SUNDAY WHICH WILL SEE HIGHS IN THE LOW 80S
ACROSS THE INTERIOR. CLOSER TO THE COAST THERE IS MORE UNCERTAINTY
IN THE TEMPERATURES AND THERE IS THE POTENTIAL FOR SOME STRATUS
WITH THE LIGHT WINDS. /MKK /EYS
AVIATION
VFR CONDITIONS PREVAILED AT THE TERMINALS THROUGH
MIDDAY, WITH THE EXCEPTION OF KACV WHERE LIGHT WINDS ALLOWED SOME
PESKY STRATUS PATCHES TO DRIFT OVER FROM HUMBOLDT BAY AND BECOME
PINCHED ALONG THE IMMEDIATE COAST. DAYTIME HEATING WON OUT AS
NORTHERLY WINDS BEGAN INCREASING FOR THE AFTERNOON. INCLUDED SOME
WIND SHEAR IN THE TAFS FOR THE NORTHERLY AND NORTHEASTERLY WINDS
ALOFT. LOOKED MOST PRONOUNCED AT KACV, AND MORE MARGINAL ELSEWHERE.
THE DRY NORTHERLY FLOW SHOULD PREVENT MUCH STRATUS OR FOG FROM
DEVELOPING TONIGHT; HOWEVER, COULD SEE A SIMILAR MIGRATION OF PATCHY
LOW CLOUDS FROM HUMBOLDT BAY TO KACV IN THE EARLY MORNING HOURS FOR
VERY BRIEF MVFR CIGS AND VIS. GUSTY NORTHERLY WINDS WILL DEVELOP
ONCE AGAIN TOMORROW, WITH MORE NORTHEASTERLY FLOW ALOFT TOMORROW
NIGHT.
MARINE
GALE WARNINGS CONTINUE THROUGH ACROSS THE OUTER
WATERS WHILE WINDS ARE EXPECTED TO REACH NEAR GALE IN THE INNERS
LATE THIS AFTERNOON. AN UPPER-LEVEL LOW WILL BEGIN TO DROP DOWN FROM
THE NORTH AND NUDGE WEST TOMORROW NIGHT, AND THIS WILL BEGIN A
WEAKENING TREND THROUGH THE FIRST HALF OF THIS WEEK, WITH EACH
SUCCESSIVE AFTERNOON'S PULSE IN STRENGTH WEAKENING WITH EACH DAY.
EXTENDED THE CURRENT MARINE PRODUCTS IN THE AFTERNOON PACKAGE TO
COVER THE ONGOING HAZARDOUS SEAS THAT WILL REMAIN OVERNIGHT AS THE
GALE TEMPORALLY EASES A BIT, BEFORE CRANKING BACK UP TOMORROW. SEAS
WILL CONTINUE TO BE PRIMARILY LOCALLY GENERATED FOR THE FORESEEABLE
FUTURE, RESPONDING TO FLUCTUATIONS IN NEARSHORE NORTHERLY WINDS.
THUS, SEAS WILL PULSE EACH EVENING AS WELL, FOLLOWING A SIMILAR
WEAKENING TREND THROUGH THE FIRST HALF OF THIS WEEK. THE WINDS LOOK
TO WEAKEN FURTHER LATE WEEK AS THE UPPER-LOW FADES AND THE GRADIENT
BECOMES DIFFUSE. A WELL-DEFINED RIDGE AXIS IS LOOKING LIKELY TO MOVE
OVERHEAD LATE THIS WEEK, POTENTIALLY KEEPING LOCAL WINDS DOWN
THROUGH THE WEEKEND.
EKA WATCHES/WARNINGS/ADVISORIES
CA...NONE.
NORTHWEST CALIFORNIA COASTAL WATERS...HAZARDOUS SEAS WARNING UNTIL 4 AM PDT WEDNESDAY FOR PZZ450.
GALE WARNING UNTIL 4 AM PDT WEDNESDAY FOR PZZ470-475.
SMALL CRAFT ADVISORY UNTIL 4 AM PDT WEDNESDAY FOR PZZ455.
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