225
FXHW60 PHFO 011308
AFDHFO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
308 AM HST MON JUN 1 2026
SYNOPSIS
MODERATE TRADES WEAKEN GIVING WAY TO LAND AND SEA BREEZES THROUGH
EARLY THIS WEEK. INCREASING MOISTURE WILL MOVE UP THE ISLAND
CHAIN FROM THE SOUTHEAST THROUGH THE EARLY PORTION OF THE WEEK
RESULTING IN INCREASED SHOWER COVERAGE OVER ISLAND INTERIORS.
TRADES RETURN LATE WEDNESDAY AND CONTINUE THROUGH THE FORECAST
PERIOD.
DISCUSSION
LATEST SATELLITE AND RADAR IMAGERY SHOW A SHORT-WAVE THATS NEAR
OVERHEAD OR JUST TO THE NORTHEAST OF THE ISLAND CHAIN AND SAGGING
SOUTHWARD. LOW CLOUDS ARE MOVING ACROSS THE ISLANDS WITHIN THE
TRADE WIND FLOW. RADAR IMAGERY SHOWS SCATTERED SHOWERS ONGOING
ACROSS THE ISLANDS, MOSTLY IMPACTING WINDWARD AND MAUKA LOCATIONS
WITH SOME LIMITED SPILLOVER TO LEEWARD AREAS. SOME HEAVIER SHOWERS
ARE IMPACTING WINDWARD BIG ISLAND CAUSING SOME MINOR FLOODING OR
PONDING ON ROADWAYS AND LOW-LYING FLOOD PRONE AREAS.
AS THE AFOREMENTIONED SHORTWAVE CONTINUES ADVANCING THROUGH THE
AREA, INCREASING SHOWERS WILL BE MOST PRONOUNCED OVER THE EASTERN
END OF THE STATE TODAY THEN EXPAND UP THE ISLAND CHAIN BY TUESDAY.
TRADES BACK NORTHEAST AND STRENGTHEN TO MODERATE LEVELS DURING
THE EARLY PORTION OF THE WEEK, FOCUSING SHOWERS WINDWARD AND
MAUKA. BREEZY TRADES THEN ESTABLISH DURING THE SECOND HALF OF THE
WEEK AS THE SUBTROPICAL RIDGE STRENGTHENS NORTH OF THE AREA.
AVIATION
AN UPSTREAM TROUGH WILL CONTINUE TO BRING PERIODS OF MVFR LOW
CLOUDS AND SHOWERS TO WINDWARD MOUNTAIN AREAS OF MOST ISLANDS
THROUGH THE EARLY MORNING HOURS. PULSES OF WET WEATHER CONTINUE
ACROSS THE HAWAII REGION FOR THE NEXT FEW DAYS.
AIRMET SIERRA REMAINS IN EFFECT FOR MOUNTAIN OBSCURATION ABOVE
2000 FEET FOR MOST WINDWARD ISLAND MOUNTAINS THROUGH THE EARLY
MORNING HOURS.
MARINE
LIGHT TO MODERATE TRADE WINDS WILL PERSIST TODAY, THEN GRADUALLY
STRENGTHEN INTO THE FRESH TO LOCALLY STRONG CATEGORY TUESDAY
THROUGH THE LATTER HALF OF THE WEEK AS THE SUBTROPICAL RIDGE
BUILDS NORTH OF THE STATE. SMALL CRAFT ADVISORY CONDITIONS WILL
LIKELY DEVELOP IN THE TYPICALLY WINDIER CHANNELS AND WATERS AROUND
MAUI COUNTY AND THE BIG ISLAND BEGINNING TUESDAY.
SURF ALONG EXPOSED SOUTH-FACING SHORES WILL REMAIN ELEVATED THIS
WEEK AS A SERIES OF OVERLAPPING SOUTH TO SOUTH-SOUTHWEST SWELLS
MOVE THROUGH THE REGION. THE CURRENT SOUTH SWELL, WHICH PEAKED
OVER THE WEEKEND, IS SLOWLY EASING, WITH THE PEAK ENERGY DOWN
INTO THE 14-15 SECOND BAND. LONG-PERIOD FORERUNNERS FROM THE NEW
SOUTH-SOUTHWEST SWELL WILL STEADILY FILL IN TODAY, LEADING TO A
BUILDING TREND BY TONIGHT.
SURF IS EXPECTED TO RETURN TO ADVISORY LEVELS TONIGHT THROUGH
TUESDAY AND LIKELY RISE ABOVE THE ADVISORY THRESHOLD BY MIDWEEK AS
THE SWELL PEAKS. WHILE SOME OF THE PEAK ENERGY MAY HAVE MISSED
THE PACIOOS AMERICAN SAMOA BUOY TO THE EAST OVER THE WEEKEND,
OBSERVATIONS SUGGEST SURF HEIGHTS SHOULD PEAK LOCALLY NEAR, OR
POSSIBLY JUST BELOW, THE HIGH SURF WARNING THRESHOLD OF 15-FOOT
FACES ALONG SOUTH-FACING SHORES AROUND WEDNESDAY. A GRADUAL
DOWNWARD TREND IS THEN EXPECTED THROUGH THE LATTER HALF OF THE
WEEK.
SURF ALONG NORTH-FACING SHORES WILL INCREASE TUESDAY AND REMAIN
UP THROUGH FRIDAY AS A PAIR OF OVERLAPPING NORTHERLY SWELLS
ARRIVE FROM A BROAD GALE FAR NORTH OF THE STATE NEAR THE ALEUTIAN
ISLANDS. SEASONAL SURF CONDITIONS SHOULD RETURN BY THE WEEKEND.
SURF ALONG EAST-FACING SHORES WILL GRADUALLY BUILD BY MIDWEEK AS
STRENGTHENING TRADE WINDS GENERATE INCREASING SHORT-PERIOD WIND
WAVES. SURF SHOULD RETURN TO NEAR SEASONAL LEVELS BY THE END OF
THE WEEK.
HFO WATCHES/WARNINGS/ADVISORIES
NONE.
DISCUSSION...WALSH
AVIATION...BOHLIN
MARINE...GIBBS
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