967
FXUS66 KEKA 022034
AFDEKA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
134 PM PDT THU APR 2 2026
SYNOPSIS
WIDESPREAD FROST AND NEAR-OR-BELOW FREEZING
TEMPERATURES POSSIBLE TONIGHT. A WARMING AND DRYING TREND BEGINS
FRIDAY INTO THE WEEKEND.
KEY MESSAGES
-WIDESPREAD FROST AND NEAR OR BELOW FREEZING TEMPERATURES POSSIBLE
ACROSS THE AREA TONIGHT.
-MUCH WARMER AND DRIER CONDITIONS RAPIDLY BUILDING FRIDAY AND INTO
THE WEEKEND.
-CHANCE (40%) OF WETTING RAIN RETURN MID NEXT WEEK.
DISCUSSION
A RIDGE OF HIGH PRESSURE HAS RAPIDLY BUILT OVER THE
AREA TODAY. CLEAR SKIES AND RAPIDLY DRYING AIR MAY SUPPORT SOME
FROST FORMATION TONIGHT AND EARLY FRIDAY MORNING. LOW TEMPERATURES
IN THE 20S AND 30S ARE LIKELY ACROSS THE AREA. A FEW WINDY SPOTS
NEAR THE COAST AND IN EASTERN LAKE COULD BE IN THE 40S. A FROST
ADVISORY HAS BEEN ISSUED FOR INTERIOR DEL NORTE, HUMBOLDT,
MENDOCINO, AND NORTHERN AND WESTERN LAKE COUNTIES. FOG MAY FORM IN
SOME VALLEYS, WHICH WOULD REDUCE THE RISK OF FROST, HOWEVER,
CONFIDENCE IS LOW ON WHICH VALLEYS WILL SEE FOG. MEANWHILE, ENHANCED
NORTHEAST WINDS OVERNIGHT IN EASTERN LAKE COUNTY WILL LIKELY INHIBIT
ANY FROST THERE.
SOLIDLY WARMER THAN NORMAL CONDITIONS WILL ARRIVE BY FRIDAY. WARMING
WILL PEAK THIS WEEKEND WITH INTERIOR HIGH TEMPERATURES IN THE LOW TO
MID 80S. MARINE AIR WILL BE RESTRICTED TO A SHALLOW MARINE LAYER AT
THE COAST, ESPECIALLY AFTER MODERATE NORTH WINDS ALONG SHORE ON
FRIDAY GIVE WAY TO NEARLY CALM WINDS THIS WEEKEND.
THERE IS HIGH CONFIDENCE THAT HIGH PRESSURE WILL GRADUALLY WEAKEN BY
EARLY NEXT WEEK WITH A LOW PRESSURE SYSTEM MOVING IN ALONG SHORE.
THE PATH, STRENGTH, AND MOISTURE ASSOCIATED WITH THIS LOW REMAINS
HIGHLY VARIABLE HOWEVER. ABOUT 45% OF MODEL ENSEMBLE MEMBERS SUGGEST
WETTING RAIN ACROSS THE NORTHERN HALF OF THE AREA, THOUGH LESS THAN
10% SHOW POTENTIAL FOR ANY AMOUNT OVER 1.0 INCH. /JHW/JB
AVIATION...18Z TAFS
DRYING CONDITIONS AND LIGHT NORTHERLY WINDS
DEVELOPED BEHIND A FRONTAL PASSAGE. THE INCREASING NORTHERLY WINDS
AND LIGHT OVERNIGHT OFFSHORE FLOW ARE EXPECTED TO GENERALLY MAINTAIN
VFR CONDITIONS THROUGH FRIDAY AFTERNOON. SOME OF THE MORE SHELTERED
INTERIOR VALLEYS WILL SEE SOME PATCHY FOG. FARTHER SOUTH AT UKI,
THERE IS A CONDITIONAL PROBABILITY (30%) FOR VISIBILITIES LESS THAN
1SM AND FOG DEVELOPMENT. GIVEN THE RECENT SURFACE MOISTURE, THIS
COULD EVOLVE INTO MORE A LIKELY SCENARIO AS MODELS VERY POORLY
RESOLVE THIS TYPE OF RADIATIONAL FOG IN THIS REGION.
MARINE
A STEEP WESTERLY SWELL PEAKED EARLY THURSDAY MORNING AND
IS SUBSIDING. NORTHERLY WINDS ARE INCREASING BEHIND A FRONTAL
PASSAGE. STRONGER NORTHERLIES WILL CONTINUE TO SPREAD OVER THE WATER
OVERNIGHT. BY FRIDAY AFTERNOON, SOME LOCALIZED GALE STRENGTH GUSTS
OF 34 KTS WILL DEVELOP IN AN EXPANSION FAN AROUND AND SOUTH OF CAPE
MENDOCINO. THE NORTHERLY WINDS WILL QUICKLY SUBSIDE SATURDAY AS A
STRONG RIDGE OF HIGH PRESSURE CENTERS OVER THE N CA WATERS. SEAS ARE
FORECAST TO DROP BELOW 10 FT LATE FRIDAY, AND THE LINGERING SHORT
PERIOD SEAS WILL QUICKLY FADE GOING INTO SATURDAY MORNING.
EKA WATCHES/WARNINGS/ADVISORIES
CA...
FROST ADVISORY FROM 1 AM TO 9 AM PDT FRIDAY FOR CAZ102>106-
109>115.
NORTHWEST CALIFORNIA COASTAL WATERS...
SMALL CRAFT ADVISORY UNTIL 6 AM PDT SATURDAY FOR PZZ450-455.
SMALL CRAFT ADVISORY UNTIL 11 AM PDT SATURDAY FOR PZZ470-
475.
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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