624
FXHW60 PHFO 200642
AFDHFO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
842 PM HST TUE MAY 19 2026
SYNOPSIS
TRADE WINDS WILL STEADILY INCREASE WEDNESDAY THROUGH THURSDAY
NIGHT AND WILL BRING WINDY CONDITIONS BY THURSDAY. WIND SPEEDS
COULD INCREASE TO WIND ADVISORY LEVEL, ESPECIALLY OVER MAUI COUNTY
AND THE BIG ISLAND ON THURSDAY. PASSING SHOWERS WILL CONTINUE TO
RIDE IN WITH THE BREEZY TO WINDY TRADE WINDS THROUGH THE WEEKEND.
UPDATE
LATEST SATELLITE IMAGERY SHOWS A BAND OF MOISTURE JUST EAST OF THE
STATE WHICH SHOULD BE ARRIVING LATE TONIGHT INTO WEDNESDAY
MORNING. SCATTERED SHOWERS WILL RIDE IN WITH THE STRENGTHENING
TRADE WINDS, WHICH SHOULD MAINLY BE FOCUSED OVER WINDWARD AND
MAUKA AREA. A FEW SHOWERS WILL ALSO BE POSSIBLE OVER LEEWARD
AREAS. A DRIER AIR MASS WILL MOVE IN LATE WEDNESDAY INTO THURSDAY,
BUT WITH THE WINDY CONDITIONS, LIGHT PASSING SHOWERS ARE STILL
EXPECTED OVER WINDWARD AND MAUKA AREAS.
PREV DISCUSSION
ISSUED AT 316 PM HST TUE MAY 19 2026
RADAR SHOWED SCATTERED SHOWERS OVER THE KONA SLOPES THIS
AFTERNOON, ALONG WITH ISOLATED WINDWARD AND MAUKA SHOWERS ON ALL
ISLANDS. CLOUD COVER RANGED FROM MOSTLY CLEAR TO OVERCAST, WITH
THE CLEARER CONDITIONS GENERALLY OVER LEEWARD AREAS. SHOWERS
SHOULD WEAKEN AROUND SUNSET, BUT A FEW WILL CONTINUE OVERNIGHT
MAINLY WINDWARD AND MAUKA.
MODELS REMAIN CONSISTENT SHOWING TRADE WINDS DRYING OUT AND
INCREASING IN SPEED THROUGH THURSDAY. HIGHER WIND SPEEDS,
POTENTIALLY REACHING WIND ADVISORY LEVEL, WILL ARRIVE TOMORROW AND
CONTINUE INTO FRIDAY AND PERHAPS FRIDAY NIGHT. SHOWERS WILL
DECREASE BOTH IN NUMBER AND INTENSITY ONCE THE DRIER AIR ARRIVES,
WITH THE MAIN DRYING OCCURRING WEDNESDAY AFTERNOON INTO THE
EVENING.
A CONSISTENT MODERATE TO OCCASIONALLY STRONG TRADE WIND FLOW IS
EXPECTED TO CONTINUE THROUGH THE WEEKEND AND WELL INTO NEXT WEEK
AS A LARGE SURFACE HIGH TO OUR NORTH REMAINS STRONG ENOUGH TO
DOMINATE OUR WEATHER. A BAND OR TWO OF ENHANCED MOISTURE MAY
ARRIVE AFTER THE WEEKEND, BUT IT'S TOO SOON TO TIME THAT OUT
RELIABLY.
AVIATION
MODERATE TO FRESH TRADE WINDS WILL STRENGTHEN WEDNESDAY AND
THURSDAY AS HIGH PRESSURE BUILDS. SHOWERS WILL MOSTLY AFFECT
WINDWARD AND MOUNTAIN AREAS AS WELL AS THE NIGHT TIME AND EARLY
MORNING HOURS. DRIER AIR COULD FILL IN LATER TOMORROW NIGHT,
LIMITING SHOWERS.
AIRMET SIERRA FOR MOUNTAIN OBSCURATION MAY BE NEEDED TOMORROW
MORNING, BEFORE DRIER CONDITIONS SETTLE IN LATER ON WEDNESDAY.
THE INCREASING TRADE WINDS AND INVERSION TONIGHT AND WEDNESDAY
WILL LIKELY REQUIRE AIRMET TANGO.
MARINE
ISSUED AT 316 PM HST TUE MAY 19 2026
LOCALLY FRESH TRADES BECOME STRONG WITH LOCALIZED NEAR-GALES
DURING THE LATTER HALF OF THE WEEK. THE SMALL CRAFT ADVISORY (SCA)
REMAINS IN EFFECT AND WILL EVENTUALLY BE EXPANDED TO ALL WATERS
AS WINDS AND SEAS BUILD LATER THIS WEEK.
SMALL, SHORT TO MEDIUM PERIOD NNW SWELL FILLING IN TODAY. THIS
WILL BE FOLLOWED LATER THIS WEEK BY A SMALL NNW SWELL EMANATING
FROM A STRONG LOW NEAR THE ALEUTIAN ISLANDS. A SERIES OF SMALL,
LONG PERIOD SSW SWELLS SUPPORTS NEAR-AVERAGE SURF ALONG S SHORES.
MEANWHILE, STRENGTHENING TRADES MAINTAIN ELEVATED SURF AND SHORT
PERIOD FRESH SWELL ALONG E FACING SHORES INTO NEXT WEEK.
HFO WATCHES/WARNINGS/ADVISORIES
SMALL CRAFT ADVISORY UNTIL 6 PM HST WEDNESDAY FOR ALENUIHAHA
CHANNEL-BIG ISLAND LEEWARD WATERS-BIG ISLAND SOUTHEAST WATERS-
MAALAEA BAY-PAILOLO CHANNEL.
UPDATE...KINO
DISCUSSION...PARKER
AVIATION...TSAMOUS
MARINE...JVC
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