910
FXHW60 PHFO 050101
AFDHFO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
301 PM HST THU JUN 4 2026
SYNOPSIS
BREEZY TRADES DELIVER SHOWERS WINDWARD AND MAUKA THROUGH THE
FORECAST PERIOD.
DISCUSSION
BATCH OF MOISTURE ADVANCING THROUGH THE ISLAND CHAIN TODAY HAS
RATHER EFFICIENTLY PRODUCED NUMEROUS SHOWERS WINDWARD AND MAUKA,
EVEN DURING THE UNFAVORABLE PEAK HEATING PERIOD AND BENEATH
BUILDING SUBSIDENCE ASSOCIATED WITH 500MB HEIGHT RISES TO 590+DM. BREEZY
TRADES WILL DELIVER SOME OF THE TALLER SHOWERS TO LEEWARD ZONES
THROUGH LATE AFTERNOON. SATELLITE TRENDS SUGGEST THIS ACTIVITY
WILL SHIFT WEST OF THE AREA BY LATE THIS EVENING. VERY LITTLE
CHANGE GOING FORWARD AS A SEASONALLY STABLE AND BENIGN TRADE WIND
PATTERN PERSISTS WELL INTO NEXT WEEK.
AVIATION
MODERATE TO BREEZY TRADE WINDS WITH EMBEDDED SHOWERS ARE EXPECTED
THROUGH TOMORROW. SHOWERS ARE PRIMARILY AFFECTING WINDWARD AND
MOUNTAIN AREAS, BUT ARE CAPABLE OF SPILLING OVER INTO LEEWARD
AREAS AS WELL. EXPECT MVFR TO ISOLATED AND BRIEF IFR CONDITIONS
WITHIN SHOWERS, AND VFR ELSEWHERE.
AIRMET TANGO IS IN EFFECT FOR MODERATE TURBULENCE BELOW 8KFT FOR
AREAS DOWNWIND OF TERRAIN DUE TO BREEZY TRADE WINDS. EXPECT THIS
TO REMAIN FOR THE NEXT COUPLE OF DAYS, AS THE BREEZY TRADE WINDS
REMAIN STEADY.
AIRMET SIERRA IS IN EFFECT FOR MOUNTAIN OBSCURATIONS ACROSS
WINDWARD AND MOUNTAIN AREAS FROM KAUAI THROUGH MAUI. EXPECT THESE
CONDITIONS TO GENERALLY PREVAIL THROUGH TOMORROW DUE TO UPSTREAM
AND ONGOING SHOWERS.
MARINE
FRESH TO STRONG EASTERLY TRADES WILL PREVAIL AS HIGH PRESSURE
REMAINS ANCHORED FAR NORTHEAST OF THE ISLANDS THROUGH THE
WEEKEND. A SMALL CRAFT ADVISORY (SCA) FOR THE TYPICALLY WINDIER
CHANNELS AND WATERS AROUND MAUI COUNTY AND THE BIG ISLAND REMAINS
IN EFFECT THROUGH SATURDAY AND WILL LIKELY BE EXTENDED THROUGH AT
LEAST MONDAY. TRADES MAY EASE SLIGHTLY TUESDAY AS HIGH PRESSURE
SHIFTS AWAY TO THE NORTHEAST.
A MODERATE TO LARGE SOUTH-SOUTHWEST SWELL WILL MAINTAIN SURF ABOVE
THE HIGH SURF ADVISORY (HSA) THRESHOLD ALONG SOUTH-FACING SHORES
THROUGH THIS EVENING BEFORE CONTINUING TO GRADUALLY DECLINE,
ALLOWING SURF HEIGHTS TO DROP BELOW HSA THRESHOLDS LATE TONIGHT.
NEARSHORE BUOYS CONTINUE TO OBSERVE THIS SWELL AROUND 4 TO 5 FEET,
15 SECONDS, AND OFFSHORE BUOY 51002 HASN'T DROPPED MUCH THROUGH
THE DAY, MAINTAINING SWELL AROUND 3 FEET, 15 SECONDS. WITH THESE
SWELLS BEING HELD THROUGH THE AFTERNOON AND SURF CAMS STILL
SHOWING SURF HEIGHTS AROUND 10 FEET AT THE STANDOUT SPOTS, DECIDED
TO EXTEND THE HSA THROUGH MIDNIGHT TONIGHT. OVERNIGHT, SURF IS
EXPECTED TO FALL TO MODERATE LEVELS AND WILL CONTINUE TO GRADUALLY
FADE THROUGH SUNDAY. A SMALL LONG-PERIOD SOUTH-SOUTHWEST SWELL IS
EXPECTED TO ARRIVE LATE SUNDAY AND PEAK EARLY NEXT WEEK.
ALONG NORTH-FACING SHORES, A SMALL MEDIUM-PERIOD NORTH SWELL WILL
BUILD TONIGHT AND IS FORECAST TO PEAK EARLY FRIDAY, THEN EASE
OVER THE WEEKEND. A TINY WEST-NORTHWEST SWELL IS POSSIBLE EARLY
NEXT WEEK. SURF ALONG EAST-FACING SHORES WILL GRADUALLY BUILD TO
AROUND SEASONAL AVERAGE BY FRIDAY, THOUGH SOME AREAS EXPOSED TO
WRAPPING NORTH SWELL COULD BE SLIGHTLY LARGER THURSDAY NIGHT AND
FRIDAY. NEAR AVERAGE EAST SHORE SURF WILL PREVAIL THIS WEEKEND
INTO EARLY NEXT WEEK.
HFO WATCHES/WARNINGS/ADVISORIES
HIGH SURF ADVISORY UNTIL 12 AM HST TONIGHT FOR SOUTH FACING SHORES
OF ALL HAWAIIAN ISLANDS.
SMALL CRAFT ADVISORY UNTIL 6 PM HST SATURDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.
DISCUSSION...JVC
AVIATION...DT
MARINE...FARRIS
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