787
FXHW60 PHFO 231312
AFDHFO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
312 AM HST SAT MAY 23 2026
SYNOPSIS
BREEZY TO LOCALLY WINDY TRADES WILL WEAKEN SLIGHTLY THROUGH
MONDAY, THEN HOLD AT MODERATE STRENGTH THROUGH THE REMAINDER OF
THE WEEK. SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS, WITH LITTLE
RAINFALL OVER MOST LEEWARD SECTIONS.
DISCUSSION
SATELLITE AND RADAR TRENDS THIS MORNING SHOW SCATTERED SHOWERS
ACROSS WINDWARD AND MAUKA LOCATIONS WITHIN THE LOW CLOUDS RINDING
IN ON THE TRADES. A SURFACE HIGH CENTERED ABOUT 950 MILES NORTH OF
THE ISLANDS IS DRIVING THE STRONG TRADE WIND FLOW, AND MID LEVEL
RIDGING NORTHWEST OF THE STATE IS CREATING STABLE CONDITIONS.
UNDER THIS ENVIRONMENT, WINDS CONTINUE TO BE ACCELERATED OVER AND
DOWNWIND OF TERRAIN, AND THE WIND ADVISORY HAS BEEN EXTENDED
THROUGH TONIGHT FOR PORTIONS OF BIG ISLAND AND MAUI. EVEN THOUGH
THE ATMOSPHERE IS STABLE AND PWATS ARE NEAR TO BELOW SEASONAL
AVERAGES, TRADES WILL CONTINUE TO FOCUS SHOWERS OVER WINDWARD AND
MAUKA AREAS. ASIDE FROM A FEW LINGERING SHOWERS OVER THE KONA
SLOPES OF THE BIG ISLAND LIMITED RAINFALL IS EXPECTED ARCOSS
LEEWARD AREAS. THESE SHOWERS AND MODERATE TRADES WILL CONTINUE
THROUGH THE MIDDLE OF NEXT WEEK.
AVIATION
BREEZY TRADES WILL CONTINUE INTO THE DAY TODAY FOR MOST SITES.
INTERMITTENT SHOWER ACTIVITY IS ALSO POSSIBLE ALONG MAINLY
WINDWARD SITES, WHICH MAY OCCASIONALLY RESULT IN MVFR AND EVEN IFR
CONDITIONS. OTHERWISE VFR IS EXPECTED TO PREVAIL. TRADES ARE
STILL EXPECTED TO DECREASE SLIGHTLY THIS WEEKEND.
AIRMET SIERRA REMAINS IN EFFECT FOR MOUNTAIN OBSCURATION FOR
WINDWARD MAUI AND BIG ISLAND, WITH CONDITIONS EXPECTED TO IMPROVE
BY LATE MORNING.
AIRMET TANGO ALSO REMAINS IN EFFECT FOR LOW-LEVEL TURBULENCE OVER
AND DOWNWIND OF TERRAIN AS A RESULT OF AMPLIFIED TRADES, WHICH IS
EXPECTED TO CONTINUE INTO AT LEAST SUNDAY.
MARINE
A STRONG HIGH PRESSURE RIDGE WILL REMAIN NORTH OF THE HAWAIIAN
ISLANDS MAINTAINING STRONG TO NEAR GALE FORCE TRADE WINDS INTO
SATURDAY. THE HIGH WILL BEGIN A WEAKENING TREND SATURDAY THEN
SHIFT NORTHEAST OF THE STATE DURING THE FIRST HALF OF NEXT WEEK.
STRONG TRADE WINDS WILL GRADUALLY TREND DOWN TO MODERATE TO
LOCALLY STRONG SPEEDS BY TUESDAY AND THEN HOLD THROUGH THE END OF
NEXT WEEK.
A SMALL CRAFT ADVISORY (SCA) FOR ALL HAWAIIAN COASTAL WATERS
REMAINS IN EFFECT THROUGH EARLY SUNDAY MORNING. THE SCA CONDITIONS
WILL LIKELY CONTINUE FOR LOCALLY WINDIER WATERS THROUGH THE FIRST
HALF OF NEXT WEEK.
A HIGH SURF ADVISORY (HSA) FOR EAST FACING SHORES HAS BEEN
CANCELLED. NEAR SHORE OBSERVATIONS SHOW SURF HEIGHTS HAVE DROPPED
BELOW ADVISORY LEVELS THRESHOLDS THUS HAVE WENT AHEAD AND
CANCELLED THE HSA. SURF HEIGHTS ARE EXPECTED TO REMAIN JUST BELOW
ADVISORY THRESHOLDS THROUGH THE WEEKEND AND TREND DOWN NEXT WEEK
AS TRADE WIND SPEEDS EASE LOCALLY AND UPSTREAM.
SURF ALONG NORTH FACING SHORES WILL REMAIN TINY TODAY. A SMALL,
MODERATE PERIOD NORTH-NORTHWEST (330 DEGREE) SWELL WILL TRICKLE
IN EARLY SATURDAY AND PEAK SATURDAY NIGHT, BRINGING A SMALL BOOST
IN SURF HEIGHTS ALONG NORTH AND WEST FACING SHORES THROUGH THE
WEEKEND. A SLIGHTLY LARGER NORTHWEST SWELL WILL FILL IN TUESDAY
AND PEAK WEDNESDAY OF NEXT WEEK THAT COULD BRING NEAR TO SLIGHTLY
ABOVE AVERAGE SUMMERTIME SURF FOR NORTH AND WEST FACING SHORES.
A SMALL, LONG PERIOD SOUTH SWELL WILL CONTINUE TO FILL IN
TONIGHT, PEAK SATURDAY, BOOSTING SURF TO NEAR TO SLIGHTLY ABOVE
AVERAGE. THIS SWELL WILL BEGIN TO FADE OUT SUNDAY. ANOTHER
SIMILAR SOUTH SWELL WILL SLOWLY FILL IN TUESDAY, PEAK WEDNESDAY
THEN SLOWLY FADE INTO THE SECOND HALF OF NEXT WEEK.
HFO WATCHES/WARNINGS/ADVISORIES
WIND ADVISORY UNTIL 6 PM HST THIS EVENING FOR MAUI WINDWARD WEST-
MAUI LEEWARD WEST-KOHALA-MAUI CENTRAL VALLEY NORTH-MAUI CENTRAL
VALLEY SOUTH-SOUTH HALEAKALA-BIG ISLAND SOUTH-BIG ISLAND
SOUTHEAST-BIG ISLAND NORTH.
SMALL CRAFT ADVISORY UNTIL 6 AM HST SUNDAY FOR ALL HAWAIIAN
WATERS-
DISCUSSION...WALSH
AVIATION...EVANS
MARINE...BOHLIN
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