542
FXUS66 KEKA 052200
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
300 PM PDT TUE MAY 5 2026
SYNOPSIS
HIGH PRESSURE RIDGING BUILDING IN WILL TREND
TEMPERATURES WARMER BEHIND A DEPARTING AREA OF LOW PRESSURE. DEEPLY
EMBEDDED STRATUS WILL LIMITS SUNSHINE CLOSER TO THE COAST IN THE
NEAR TERM. HOT INLAND TEMPERATURES ARE PROBABLE NEXT WEEK.
DISCUSSION
AFTERNOON SATELLITE IMAGERY SHOWED A GREATLY
DEEPENED MARINE LAYER OVER A GOOD PORTION OF DEL NORTE, HUMBOLDT
AND MENDOCINO COUNTIES. OTHER THEN SOME PERIODS OF AFTERNOON
CLEARING, THIS CLOUDIER PATTERN WILL REMAIN THROUGH WEDNESDAY.
THERE ARE INDICATIONS THE BOUNDARY LAYER WILL DRY OUT MORE THROUGH
LATE WEEK.
TEMPERATURES ARE TRENDING HIGHER WITH BUILDING HIGH PRESSURE, AND
THE INTERIOR WILL BE NOTICEABLY WARMER STARTING WEDNESDAY. A
WEAKENING AND MOSTLY DRY FRONT WILL PASS THROUGH FRIDAY, TEMPORARILY
LOWERING INLAND TEMPERATURES BY A FEW DEGREES AND PERHAPS COAXING
OUT SOME LIGHT COASTAL DRIZZLE.
THE RIDGE WILL QUICKLY RE-AMPLIFY THROUGH THE WEEKEND AND INTO NEXT
WEEK. THERE ARE HIGH PROBABILITIES FOR INLAND TEMPERATURES TO EXCEED
90 DEGREES AS EARLY AS SUNDAY FOR THE WARMER INTERIOR VALLEYS, WITH
INCREASING CHANCES MONDAY AND TUESDAY OF NEXT WEEK. THERE ARE
MODERATE TO HIGH CHANCES (70%) FOR AN EXCEEDANCE OF 95 DEGREES
MONDAY AND TUESDAY FOR THE INTERIOR VALLEYS. CONDITIONS AS
FORECAST WOULD CREATE AREAS OF MODERATE HEATRISK.
AVIATION
THE STRATUS STRONGHOLD IS BEGINNING TO BREAK OVER THE
COASTAL AREAS WITH RAPID CLEARING SOUTH OF CAPE MENDOCINO. STRATUS
IS DEFINITELY PERSISTENT OFFSHORE AND LIKELY TO FILL BACK IN
TONIGHT. GFS HAS THE CEILINGS COMING DOWN TO LIFR, BELOW 500 FEET
TONIGHT. WITH HIGH PRESSURE FILLING IN AND MODEL SOUNDINGS SHOWING A
SIGNIFICANT INVERSION AT KCEC AND KACV, THERE IS A POSSIBILITY OF
OVERNIGHT FLIGHT CATEGORIES GETTING TO LIFR. CLOUD COVER COULD KEEP
SOME OF THE EVAPORATIVE COOLING FROM PRODUCING GROUND FOG SO
POSSIBLY NOT AS MUCH IN THE WAY OF LOW VISIBILITY, JUST LOW
CEILINGS. SIMILAR CONDITIONS FOR KUKI AS WELL WITH SOUTHERLY WINDS
AROUND 13-14Z, WHICH COULD ADVECT STRATUS UP THE VALLEY. /EYS
MARINE
WIND BEARINGS HAVE SHIFTED FROM SOUTHERLY TO
NORTHWESTERLY WITH LIGHT WINDS AROUND 5 TO 15 KTS. A NORTHWEST SWELL
AROUND 3-5 FEET AT 11-12 SECONDS WILL CONTINUE TO DECAY. THERE IS
ALSO A SECOND WAVE GROUP OF AROUND 3 FEET AT 8 SECONDS. THE WAVES
REMAIN DOMINATED BY A 3 TO 4 FOOT WAVE AT 12 SECONDS AND A 2 TO 4
FOOT WAVE AROUND 5 TO 8 SECONDS. THE WINDS ARE GENERALLY EXPECTED TO
REMAIN AROUND 5 TO 15 KT OUT OF THE NORTH THROUGH THE WORK WEEK.
LATE IN THE WEEK A SYSTEM MOVING BY TO THE NORTH MAY BRIEFLY SWITCH
THE WINDS TO THE WEST OR SOUTHWEST. OVER THE WEEKEND, HIGH PRESSURE
RETURNS AND NEAR GALE TO GALE FORCE NORTHERLY WINDS ARE EXPECTED TO
RETURN. THE WAVES ARE EXPECTED TO REMAIN FAIRLY SMALL, AROUND 3 TO 5
FEET AT 10 SECONDS. A NEW SWELL IS EXPECTED TO BUILD TO 4 TO 6 FEET
AT 14 SECONDS ON WEDNESDAY. MKK
EKA WATCHES/WARNINGS/ADVISORIES
CA...
NONE.
NORTHWEST CALIFORNIA COASTAL WATERS...
NONE.
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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