720
FXUS66 KEKA 191253
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
453 AM PST WED FEB 19 2025
SYNOPSIS
A QUICK HITTING RAIN SYSTEM WILL CONTINUE TO IMPACT
THE AREA THROUGH THIS AFTERNOON. THE STRONGEST RAIN WILL BE
FOCUSED ALONG THE HUMBOLDT AND DEL NORTE COAST. CONDITIONS WILL
QUICKLY CALM AND BEGIN TO DRY BY TONIGHT.
DISCUSSION
A FRONTAL SYSTEM MOVING ONSHORE OVERNIGHT, AND WILL
CONTINUE TO PUSH EASTWARD ACROSS THE FORECAST AREA THIS MORNING.
STRONG SOUTHERLY WINDS HAVE DEVELOPED ALONG THE NORTH COAST
OVERNIGHT. THESE WINDS ARE EXPECTED TO PEAK BRIEFLY EARLY THIS
MORNING, WITH GUSTS FROM 40 TO 50 MPH OVER THE COAST HEADLANDS
AND EXPOSED RIDGES IN DEL NORTE AND HUMBOLDT COUNTIES...LOCALLY
HIGHER OVER THE MORE PROMINENT RIDGES. AS OF 3 AM PST, RADAR
REFLECTIVITY A BAND OF LIGHT TO MODERATE RAINFALL ALONG THE COAST.
ISOLATED TO NUMEROUS SHOWERS ARE EXPECTED IN THE WAKE OF THE
FRONT AFTER SUNRISE. SHALLOW INSTABILITY WILL ALLOW CONVECTIVE
SHOWERS CAPABLE OF PRODUCE HEAVY RAIN RATES UP TO 0.40 IN/HR THIS
MORNING. RAIN WILL BE STRONGLY FOCUSED ALONG THE NORTHERN HALF OF
THE AREA, WITH 0.6 TO 1.5 INCHES MOST LIKELY ACROSS DEL NORTE
COUNTY AND 0.2 TO 0.6 INCHES IN HUMBOLDT. LOCATIONS FURTHER INLAND
AND SOUTH WILL MOST LIKELY SEE LESS THAN 0.25 INCHES. THE
HEAVIEST PRECIPITATIONS IS EXPECTED TO OCCUR IN A 6 HOUR PERIOD
RIGHT AFTER 5 AM THIS MORNING. SNOW LEVELS REMAINED OVER 5000 FEET
THIS MORNING. SCOTT MOUNTAIN PASS ON HIGHWAY 3 WILL SEE SOME
SNOW, UP TO 2 INCHES. THE FAST MOVING SHORTWAVE TROUGH IS EXPECTED
TO EXIT EASTWARD LATE THIS AFTERNOON, WITH LINGERING LIGHT
SHOWERS THROUGH THIS EVENING, MAINLY ACROSS THE NORTHERN FORECAST
AREA.
HIGH PRESSURE IS EXPECTED TO BUILDS IN DOWNSTREAM OF THE UPPER
LEVEL TROUGH TONIGHT THROUGH THURSDAY. THIS WILL PROMOTE CLEARING
SKIES AND DRY CONDITIONS ACROSS THE AREA, WITH SURFACE OFFSHORE
FLOW DEVELOPING. COLD AIR ADVECTION WILL ALLOW COLD TEMPERATURES
TONIGHT INTO THURSDAY. LOW TEMPERATURES ARE FORECAST TO BE
GENERALLY IN THE MID 30'S FOR THE COASTAL AND INTERIOR VALLEYS,
WHILE MID TO UPPER 20'S FOR THE VALLEYS IN TRINITY COUNTY.
ALTHOUGH, FOR AREAS WHERE SKIES CLEAR OUT QUICKLY, AREAS OF
VALLEY FOG ARE EXPECTED TO DEVELOP TONIGHT INTO THURSDAY. /ZVS
EXTENDED DISCUSSION
RIDGING LATE THE THE WEEK WILL GENERALLY
BRING WARMER AND DRIER CONDITIONS WITH POSSIBLY EVEN A RAGGED AND
SHALLOW MARINE LAYER ALONG THE COAST. A SHORTWAVE IN THE RIDGE
WILL MOST LIKELY GENERATE SOME MODERATE RAIN THIS WEEKEND, BUT
TIMING IS UNCERTAIN WITH RAIN POSSIBLE ANYWHERE FROM SATURDAY
THROUGH NEXT MONDAY. RAIN WOULD MOST LIKELY BE SHALLOW AND FOCUSED
ONLY ALONG THE COAST. /JHW
AVIATION
A FAST MOVING FRONT HAS ARRIVED THIS MORNING.
MVFR OR IFR CONDITIONS ARE EXPECTED AS THE FRONT PASSES. GUSTY WINDS
AND THE LLWS THREAT AT THE COASTAL TERMINALS PERSIST AS THE FRONT
PASSES. BOTH THE GUSTY WINDS AND LLWS WILL DIMINISH BY SUNRISE. POST-
FRONTAL SHOWERS WILL BRING VARYING CONDITIONS AT ALL THE TERMINALS
TODAY, WITH MAINLY IFR TO MVFR CONDITIONS EXPECTED IN THE MORNING,
AND MVFR TO VFR CONDITIONS IN THE AFTERNOON. SHOWERS DIMINISH LATE
THIS AFTERNOON AND EVENING. JB
MARINE
A SYSTEM IS MOVING ACROSS THE AREA THIS MORNING, BRINGING
NEAR-GALE TO GALE FORCE SOUTHERLY GUSTS NORTH OF CAPE MENDOCINO.
THIS IS A QUICK MOVING SYSTEM, AND WINDS WILL SHARPLY DECLINE AND
TURN WEST-NORTHWESTERLY AFTER THE FRONTAL PASSAGE. THE ASSOCIATED
STEEP WIND WAVES WILL QUICKLY DECAY TODAY, BUT SEAS WILL REMAIN
ELEVATED AS A LARGE MID-PERIOD WESTERLY SWELL OF 10-12 FT FILLS IN.
NORTHERLY WINDS INCREASE TONIGHT INTO THURSDAY, PARTICULARLY SOUTH
OF CAPE MENDOCINO. 20-30 KT GUSTS ARE POSSIBLE THURSDAY AFTERNOON
SOUTH OF THE CAPE, WITH THE STRONGEST WINDS IN THE LEE OF THE CAPE.
NORTH OF THE CAPE, WINDS WILL BE SLIGHTLY WEAKER (15-20KTS), WITH
SEAS CHARACTERIZED MOSTLY BY DECAYING WESTERLY SWELLS. WINDS EASE
FRIDAY, BUT ANOTHER LONG-PERIOD WESTERLY SWELL OF 10-12 FT IS
FORECAST TO FILL IN, ELEVATING SEAS ONCE AGAIN. ANOTHER SYSTEM IS
EXPECTED THIS WEEKEND, BRINGING GUSTY SOUTHERLY WINDS AND STEEP
SEAS. JB
BEACH HAZARDS
A WESTERLY SWELL OF AROUND 8-10 FT AT 16 SECONDS IS
FORECAST TO BUILD INTO THE WATERS FRIDAY. WITH LIGHT WINDS AND MILD
WEATHER EXPECTED FRIDAY, BEACHGOERS SHOULD BE CAUTIOUS AS THIS SWELL
PRESENTS A MODERATE SNEAKER WAVE THREAT. BE CAUTIOUS VISITING STEEP
BEACHES AND JETTIES AND REMEMBER TO NEVER TURN YOUR BACK ON THE
OCEAN. JB
EKA WATCHES/WARNINGS/ADVISORIES
CA...
WIND ADVISORY UNTIL 9 AM PST THIS MORNING FOR CAZ101-102-
104>106.
NORTHWEST CALIFORNIA COASTAL WATERS...
SMALL CRAFT ADVISORY UNTIL 3 AM PST THURSDAY FOR PZZ450-455.
GALE WARNING UNTIL 6 AM PST EARLY THIS MORNING FOR PZZ470.
SMALL CRAFT ADVISORY UNTIL 3 AM PST FRIDAY FOR PZZ475.
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