297
FXUS66 KEKA 222135
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
235 PM PDT TUE APR 22 2025
SYNOPSIS
COOLER OVERNIGHT TEMPERATURES WITH PLEASANT DAYTIME
HIGHS WILL CONTINUE AGAIN ON WEDNESDAY ALTHOUGH WINDS WILL BE
LIGHTER. CLOUDS, COOLER TEMPERATURES AND A CHANCE OF RAIN IS
FORECAST THURSDAY AFTERNOON THROUGH SATURDAY. DRY WEATHER IS
EXPECTED TO RETURN SUNDAY AND INTO NEXT WEEK.
DISCUSSION
HIGH PRESSURE CONTINUES TO BRING CLEAR SKIES AND
DRY CONDITIONS ACROSS THE AREA THIS AFTERNOON. TONIGHT A
SHORTWAVE MOVES BY TO THE NORTH. THIS WILL WEAKEN THE PRESSURE
GRADIENT DIMINISHING THE WINDS, BUT OTHERWISE THERE ISN'T MUCH OF
AN IMPACT EXPECTED. THE OFFSHORE FLOW COULD LIMIT THE COASTAL
CLOUDS LATE TONIGHT AND IN THE MORNING, BUT CONFIDENCE IS LOW ON
THIS. WEDNESDAY AFTERNOON WINDS WILL BE LIGHTER THAN TODAY
ACROSS THE AREA. HIGH TEMPERATURES ARE EXPECTED TO START THEIR
COOLING TREND. ALSO ON WEDNESDAY OVER SOUTHEASTERN TRINITY COUNTY
AND NORTHEAST MENDOCINO COUNTIES THERE IS SLIGHT CHANCE FOR A
SHOWER OR POSSIBLE A THUNDERSTORM IN THE AFTERNOON. MID LEVEL
LAPSE RATES AROUND 7C/KM AND THERE IS AROUND 200 J/KG OF SURFACE
CAPE. ANY SHOWERS THAT DO FORM ARE EXPECTED TO QUICKLY MOVE EAST
AND OUT OF THE AREA. WEDNESDAY NIGHT MORE WIDESPREAD COASTAL
CLOUDS ARE EXPECTED AS THE FLOW BECOMES MORE ONSHORE. THERE IS THE
POTENTIAL FOR ADDITIONAL SHOWERS OR POSSIBLE A THUNDERSTORM ON
THURSDAY AS WELL. LAPSE RATES ARE SLIGHTLY WEAKER, BUT INSTABILITY
IS STILL AROUND 200 J/KG OF SURFACE CAPE. BOTH DAYS THE FLOW IS
OUT OF THE WEST OR SOUTHWEST AND NOT A PARTICULARLY FAVORABLE
PATTERN FOR THUNDERSTORMS.
FRIDAY MORE WIDESPREAD SHOWERS ARE EXPECTED AS THE TROUGH BECOMES
MORE OF A CLOSED LOW AND MOVES OVERHEAD. THE CLOUD COVER IS
EXPECTED TO LIMIT SURFACE HEATING AND CURB THE POTENTIAL FOR ANY
THUNDERSTORMS. HIGHS ARE ONLY EXPECTED TO BE IN THE 50S IN MOST
AREAS. MUCH OF THE AREA HAS A 40 TO 60 PERCENT CHANCE OF SEEING
MORE THAN A TENTH OF AN INCH OF RAIN, BUT ONLY THE MOUNTAINS OF
HUMBOLDT AND DEL NORTE COUNTIES HAVE CLOSE TO A 50 PERCENT
PROBABILITY OF EXCEEDING A HALF INCH. SATURDAY THE UPPER LEVEL LOW
IS MOVING OUT OF THE AREA AND FEW LINGERING SHOWERS ARE POSSIBLE.
SATURDAY NIGHT THE MOISTURE AROUND IS EXPECTED TO LIMIT THE
POTENTIAL FOR FROST, BUT TEMPERATURES WILL LIKELY DROP INTO THE
30S IN THE INTERIOR VALLEYS. HIGHS ON SATURDAY ARE EXPECTED TO BE
IN THE 50S AGAIN WITH SLOWLY CLEARING SKIES. SATURDAY NIGHT IS
LIKELY GOING TO BE THE COLDEST NIGHT WITH LOWS IN THE COLDER AREAS
OF THE INTERIOR DROPPING INTO THE LOW TO MID 30S. SUNDAY SKIES ARE
EXPECTED TO FINALLY CLEAR FULLY, BUT HIGHS ARE ONLY EXPECTED TO BE
IN THE 60S. MKK
AVIATION
MAINLY VFR CONDITIONS AT ALL TAF TERMINALS THIS
AFTERNOON, BUT REDUCED VISIBILITY IN HAZE IS POSSIBLE DUE TO SEA
SPRAY. BREEZY NNW WINDS AT 15-25 KTS AND GUSTS FROM 20 TO AROUND
30 KTS ALONG THE COASTAL TERMINALS INTO THIS EVENING, WITH THE
STRONGEST WINDS AT KCEC. WINDS WILL GRADUALLY EASE AFTER 23/02Z,
HOWEVER BREEZY CONDITIONS WILL PREVAIL AT CEC THROUGH AT LEAST
23/10Z. STRATUS IS EXPECTED TO REDEVELOP IN THE VICINITY OF
HUMBOLDT BAY, AS WELL AS EXTEND ALONG THE EEL RIVER LATE TONIGHT.
SOUTHERLY WINDS NEARSHORE MAY BRING BACK IFR CEILINGS INTO ACV
LATE TONIGHT INTO WEDNESDAY MORNING. THERE IS A CHANCE OF 20-30%
FOR CEILINGS BELOW 1000 FEET BY EARLY WEDNESDAY MORNING AT KACV.
MARINE
GALES CONTINUE ACROSS THE WATERS NEAR THE CAPES AND
BEYOND 10 MILES. THIS IS ALSO CREATING STEEP WAVES OF 10 TO 15
FEET. TONIGHT THE WINDS ARE EXPECTED TO START TO DIMINISH. THE
GALE WARNINGS END AT 3PM WEDNESDAY AND THIS LOOKS ON TRACK. THE
STEEP SHORT PERIOD WAVES ARE EXPECTED TO PROPAGATE INTO THE INNER
WATERS AND A HAZARDOUS SEAS WARNING IS IN PLACE FOR THE NORTHERN
INNER WATERS THAT ARE EXPECTED TO TO SEE THE BIGGEST WAVES CLOSER
TO THE COAST. THIS ENDS AT 9AM WEDNESDAY, BUT THESE MAY DIMINISH
SOONER THAN EXPECTED.
WEDNESDAY NIGHT AND THURSDAY THE WINDS ARE EXPECTED TO CONTINUE
TO SLOWLY DIMINISH. THESE ARE EXPECTED TO THE BE THE LIGHTEST LATE
THURSDAY NIGHT AND FRIDAY MORNING AS A WEATHER SYSTEM MOVES BY TO
THE NORTH. THERE WILL LIKELY BE A SHORT TIME WHERE THEY ARE
SOUTHERLY ALTHOUGH THE MODELS ARE STRUGGLING TO RESOLVE THE EXACT
TIMING ON THIS. FRIDAY NIGHT AND INTO THE WEEKEND IT LOOKS LIKE
NORTHERLY WINDS WILL RETURN. AT THIS POINT IT DOESN'T LOOK LIKE
THE WINDS WILL BE GALE FORCE, BUT THIS MAY CHANGE AS IT COMES INTO
RANGE OF THE HIGH RESOLUTION MODELS. MKK
EKA WATCHES/WARNINGS/ADVISORIES
CA...
NONE.
NORTHWEST CALIFORNIA COASTAL WATERS...
HAZARDOUS SEAS WARNING UNTIL 9 AM PDT WEDNESDAY FOR PZZ450.
SMALL CRAFT ADVISORY UNTIL 3 PM PDT WEDNESDAY FOR PZZ455.
GALE WARNING UNTIL 3 PM PDT WEDNESDAY FOR PZZ470-475.
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