743
FXUS66 KEKA 191237
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
537 AM PDT MON MAY 19 2025
.SYNOPSIS..TRANSITIONING WEATHER PATTERNS CONTINUE AS MOISTURE
MAKES ITS WAY INTO THE AREA AROUND THE TOP OF THE RIDGE. LIGHT RAIN
WAS OBSERVED THIS MORNING IN DEL NORTE BUT IS LIKELY TO TAPER OFF
BEFORE NOON. CLOUDS COULD HINDER THE INEVITABLE WARM UP NEAR THE
COAST. WARMING WILL COMMENCE TUESDAY AND WEDNESDAY WITH HIGHS AROUND
90 INLAND. COOLER TEMPERATURES ARE EXPECTED LATE IN THE WEEK.
DISCUSSION
HIGH PRESSURE BUILDS OVER THE AREA YET CONDITIONS ARE
A BIT UNSETTLED AS AN UPPER LEVEL LOW PASSING TO THE NORTH INTERACTS
WITH THE HIGH. MOISTURE IS MAKING ITS WAY AROUND THE TOP OF THE
RIDGING PATTERN IN THE WAY OF CLOUDS AND A FEW INSTANCES OF LIGHT
STRATIFORM RAIN THIS MORNING. SOUTHERLY WINDS, ALTHOUGH LIGHT, NEAR
THE COAST HINT AT SOME SMALL SCALE DYNAMICS HELPING PRECIPITATION
EFFORTS WITH MORE OF THE LOW PRESSURE INFLUENCING CONDITIONS NEAR
THE NORTH COAST. MODEL SOUNDINGS ARE SATURATED AND STABLE IN PROFILE
WHICH CONFIRMS MORE OF A STRATIFORM PRECIPITATION AND CLOUD COVER.
THE LOW LEVEL INVERSION LOOKS MORE PROMINENT AFTER SUNRISE WITH
UPPER LEVEL WINDS DECOUPLED BELOW 750MB NEAR THE COAST. STRATUS IS
FAIRLY WIDESPREAD THIS MORNING AND HAD JUST ENTERED MENDOCINO FROM
THE NORTH AS OF 11Z. MOISTURE PROFILES ARE SHOWING A DEPTH OF 5000
FT OR GREATER WHICH WOULD EXPLAIN THE ABSENCE OF STRATUS IN EASTERN
TRINITY AND OTHER MOUNTAINOUS AREAS. LOOK FOR STRATUS TO LINGER IN
THE LOWER ELEVATIONS AND RIVER VALLEYS THIS MORNING, RECEDING BY THE
LATE AFTERNOON TO COASTAL RANGES AND INTERIOR MOUNTAINS NORTH OF
LATITUDE 40N AND WEST OF LONGITUDE -123W. WITH THIS MUCH CLOUD COVER
WE DO NOT EXPECT FROST TO BE AN ISSUE AS TEMPERATURES WILL BE
REGULATED BY THE INSULATING CLOUD LAYER, LIMITING THEM IN RANGE FROM
THE LOW TO MID 40S AT THEIR MINIMUM. TEMPERATURES IN THE AFTERNOON
WILL BE SIMILAR TO YESTERDAY IN THE NORTH, BUT SHOULD SEE SOME
WARMING IN THE SOUTH.
TUESDAY AND WEDNESDAY HIGH PRESSURE BUILDS IN MORE SUBSTANTIALLY AND
SHOULD BRING HIGHS AROUND 80 ON TUESDAY AND HIGHS IN THE MID TO
UPPER 80S ON WEDNESDAY. THESE TEMPERATURES SHOULD BE WARM ENOUGH TO
LIMIT THE POTENTIAL FOR FROST OVERNIGHT. THURSDAY AND FRIDAY THE
RIDGE IS GRADUALLY GETTING SQUASHED DOWN WITH COOLING TEMPERATURES
AND INCREASING MARINE CLOUDS. LITTLE TO NO RAIN IS EXPECTED AT THIS
POINT, BUT THERE ARE A FEW OF THE MODELS BRINGING IN SOME LIGHT RAIN
FRIDAY NIGHT. SATURDAY HIGH PRESSURE STARTS TO BUILD IN AGAIN WITH
TEMPERATURES REBOUNDING. /EYS
AVIATION
A FEW HOURS OF LIGHT RAIN AT KCEC SIGNIFY THE UNSETTLED
WEATHER IN TRANSITION. AN UPPER LEVEL LOW TO THE NORTH AND A HIGH
PRESSURE PATTERN OVER THE EASTERN PACIFIC ARE PRODUCING AGGRESSIVE
WINDS ALOFT BUT MOSTLY DECOUPLED FROM THE ABL AT KCEC AND KACV. KUKI
MAY BE THE OUTLIER AS LOW LEVEL WIND SHEAR IS POSSIBLE WITH MIXING
DOWN NOT TAKING EFFECT UNTIL 15-16Z. TAFS REFLECT THE THREAT AT KUKI
FOR LLWS. MOSTLY MVFR/VFR AT THE COASTAL TERMINALS ALTHOUGH MOS
GUIDANCE DOES SUGGEST STRATUS LINGERING AROUND AND POSSIBLY BRINGING
A SPELL OF IFR LASTING INTERMITTENTLY THROUGH THE MORNING HOURS. /EYS
MARINE
THE LIGHTER SOUTHERLY WINDS NORTH OF THE CAPE WILL VEER
AROUND TO THE NORTH BY MID MORNING AND THEN CONTINUE TO BUILD
THROUGH TUESDAY NIGHT, ESPECIALLY IN THE SOUTHERN OUTER WATERS
WHERE GUSTS WILL REACH UP TO 40 KT LATE TUESDAY, WITH 25-30 KT
GUSTS POSSIBLE ELSEWHERE. ALONG WITH STEEP WIND WAVES, A MID-
PERIOD NW SWELL FILLS IN TUESDAY, ELEVATING SEAS FURTHER. STRONGER
NORTHERLIES CONTINUE THROUGH AT LEAST WEDNESDAY, THEN WEAKEN SOME
LATE IN THE WEEK. JB/TN
EKA WATCHES/WARNINGS/ADVISORIES
CA...
NONE.
NORTHWEST CALIFORNIA COASTAL WATERS...
GALE WARNING FROM 2 PM TO 11 PM PDT TUESDAY FOR PZZ475.
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