180
FXUS66 KEKA 132143
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
243 PM PDT TUE MAY 13 2025
SYNOPSIS
DRYING AND WARMING TREND TODAY THROUGH THE REMAINDER
OF THE WEEK. BREEZY NORTHWEST WINDS IS ANTICIPATED EACH AFTERNOON.
A WEATHER SYSTEM WILL BRING COOLER TEMPERATURES, GUSTY WINDS AND A
SLIGHT CHANCE OF RAIN SATURDAY. WINDY CONDITIONS CONTINUE SUNDAY
WITH WARMER TEMPERATURES NEXT WEEK.
DISCUSSION
HIGH PRESSURE IS STARTING TO BUILD INTO THE AREA
THIS AFTERNOON. WIDESPREAD CU HAS BUILT UP ACROSS THE AREA WITH A
FEW SHOWERS STARTING TO POP UP IN LAKE COUNTY. IT IS POSSIBLE A
FEW OTHER AREAS COULD SEE A LIGHT SHOWER OR SPRINKLE, BUT OVERALL
IT LOOKS LIKE IT WILL REMAIN DRY. TONIGHT THE COOL AIRMASS AND DRY
CONDITIONS WILL ALLOW THE INTERIOR VALLEYS TO COOL OFF AND FROST
IS POSSIBLE IN AREAS WELL AWAY FROM THE COAST AND ESPECIALLY IN
THE HIGHER ELEVATION VALLEYS. SO HAVE ISSUED A FROST ADVISORY FOR
THESE AREAS.
WEDNESDAY THROUGH FRIDAY HIGH PRESSURE STARTS TO WORK IT'S WAY
TOWARDS THE COAST FROM THE WEST, BUT WEAK SHORTWAVES KEEP MOVING
DOWN THE EAST SIDE OF IT AND KEEPING THE MAIN RIDGE WELL OFF THE
COAST. HIGHS ARE EXPECTED TO WARM EACH AFTERNOON WITH HIGHS IN
KUKI REACHING NEAR 80 BY FRIDAY. WINDS ARE EXPECTED TO BREEZY EACH
AFTERNOON ALONG THE COAST, BUT NOTHING PARTICULARLY NOTABLE.
FRIDAY NIGHT THROUGH SATURDAY NIGHT ANOTHER WEATHER IS SYSTEM IS
MOVING DOWN FROM THE NORTHWEST. THERE IS THE POTENTIAL FOR SOME
RAIN WITH THIS, BUT AMOUNTS LOOK FAIRLY LIGHT. THE NBM IS ONLY
SHOWING PROBABILITIES OF A TENTH OF AN INCH OF RAIN IN DEL NORTE
COUNTY. THIS IS ALSO EXPECTED TO BRING COOLER INLAND TEMPERATURES
WITH HIGHS ONLY IN THE 60S TO AROUND 70 SATURDAY AFTERNOON.
SUNDAY TEMPERATURES ARE EXPECTED TO BE SLIGHTLY WARMER, BUT STILL
ONLY IN THE LOW TO MID 70S. WINDS ARE EXPECTED TO STRENGTHEN
BEHIND THIS WEATHER SYSTEM AND THE ECMWF IS HIGHLIGHTING NOTABLE
WINDS. THIS IS EXPECTED TO INCREASE FIRE DANGER, BUT THIS WILL
DEPEND ON HOW LOW THE RH REMAINS.
NEXT WEEK HIGH TEMPERATURES ARE EXPECTED TO WARM AND THE INLAND
AREAS MAY SEE SOME OF THE WARMEST TEMPERATURES SO FAR THIS SEASON.
THE NBM IS SHOWING A 30 TO 40 PERCENT CHANCE OF UKIAH EXCEEDING
100 LATE NEXT WEEK. MKK
AVIATION
GUSTY NORTHERLY WINDS AND CLEARING CONDITIONS
OBSERVED ACROSS ALL TERMINALS THIS AFTERNOON AS A HIGH PRESSURE
RIDGE BUILDS INTO THE NE PACIFIC. SCATTERED LOW TO MID LEVEL
CEILINGS WILL CONTINUE TO DEVELOP ON SHORE WITH DAYTIME HEATING AND
LINGERING MOISTURE FOLLOWING YESTERDAY'S FRONTAL PASSAGE. INCREASING
NORTHWESTERLY WINDS OVER THE WATERS WILL HELP SCOUR OUT CLOUD COVER
AT CEC, BUT MAY CONTINUE TO PUSH MVFR CEILINGS INTO ACV THROUGH THE
AFTERNOON. HREF SHOWS STRONGEST SIGNATURE FOR STRATUS REDEVELOPMENT
OVERNIGHT ALONG THE NORTHERN HUMBOLDT COAST, GRADUALLY DIMINISHING
INTO THE MORNING HOURS WITH LIGHT OFFSHORE FLOW. GUSTS 20 TO 30
KNOTS POSSIBLE WEDNESDAY AFTERNOON AT CEC AS A STRONG THERMAL TROUGH
DEVELOPS OVER CA. ELEVATED NORTHERLIES AND MOSTLY CLEAR CONDITIONS
EXPECTED AT ACV AND UKI WEDNESDAY AS WELL.
MARINE
INCREASING NORTHERLY WINDS WILL KEEP SEAS ELEVATED AS A
NEARSHORE MID-PERIOD SWELL CONTINUES TO DECAY. GUSTS 20 TO 30
KNOTS ARE EXPECTED TO CONTINUE IN THE OUTER WATERS AND NEARSHORE
OF CAPE MENDOCINO THROUGH THURSDAY AFTERNOON AS A THERMAL TROUGH
AND BUILDING HIGH PRESSURE ENHANCE THE COASTAL PRESSURE GRADIENT.
HIGHEST WINDS ARE LIKELY IN THE SOUTHERN WATERS WITH LOCALIZED
GALE FORCE GUSTS POSSIBLE, ESPECIALLY WEDNESDAY AND THURSDAY
AFTERNOON. DAILY DIURNAL SURGES MAY PUSH GUSTY WINDS AND STEEP
SEAS INTO PORTIONS OF THE INNER WATERS. WINDS EXPECTED TO DECREASE
FRIDAY BEFORE INCREASING AGAIN THIS WEEKEND.
EKA WATCHES/WARNINGS/ADVISORIES
CA...
FROST ADVISORY FROM 3 AM TO 9 AM PDT WEDNESDAY FOR CAZ107-
108-110-111-114.
NORTHWEST CALIFORNIA COASTAL WATERS...
SMALL CRAFT ADVISORY UNTIL 9 PM PDT THURSDAY FOR PZZ455-470-
475.
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