705
FXHW60 PHFO 041326
AFDHFO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
326 AM HST TUE AUG 4 2026
SYNOPSIS
RELATIVELY WEAK TRADES WILL CONTINUE THROUGH FRIDAY, WITH
INCREASING WIND SPEEDS THIS WEEKEND. A WEAK UPPER LEVEL TROUGH
WILL LINGER JUST NORTHWEST OF THE STATE, ALSO THROUGH AROUND
FRIDAY, BRINGING AN INCREASED CHANCE OF SHOWERS TO THE WESTERN END
OF THE STATE. THE MAIN AREA FOR SHOWERS MAY SHIFT TO THE EASTERN
END OF THE STATE THIS WEEKEND, BUT CONFIDENCE IS NOT HIGH AT THIS
TIME.
DISCUSSION
RADAR AND SATELLITE SHOW MOSTLY CLOUDY SKIES THIS MORNING, WITH
TRADE WIND SHOWERS MOST NUMEROUS OVER WINDWARD AND MOUNTAINOUS
AREAS ON OAHU AND IN KAUAI COUNTY. THERE ARE A FEW LIGHTER
SHOWERS MAKING IT OVER TO LEEWARD AREAS. WINDS ARE WEAK, AVERAGING
JUST 5 TO 10 MPH SUSTAINED.
HIGH PRESSURE AT THE SURFACE, CENTERED WELL TO OUR NNW, WILL KEEP
TRADES GOING THROUGH THE REST OF THE WORK WEEK. HOWEVER, THE
PRESSURE GRADIENT IS WEAKER NOW THAN A FEW DAYS AGO, AND WILL
REMAIN RELATIVELY WEAK THROUGH FRIDAY. AS A RESULT, TRADES WILL BE
WEAK AND A SEA BREEZE EFFECT WILL DEVELOP EACH AFTERNOON. THIS
WILL RESULT IN A FEW (MAINLY COASTAL) SHOWERS IN LEEWARD AREAS.
TRADES WILL INCREASE THIS WEEKEND, DOING AWAY WITH MOST OF THE SEA
BREEZE.
AN UPPER LEVEL TROUGH TO OUR WEST AND NORTH WILL LINGER THROUGH
FRIDAY, BRINGING SLIGHTLY MORE UNSTABLE AIR TO THE WESTERN END OF
THE STATE. THERE MAY BE A BRIEF INCREASE IN MOISTURE OVER MAINLY
KAUAI WEDNESDAY. THIS WEEKEND, ANOTHER INCREASE IN MOISTURE, THIS
TIME OVER THE EASTERN TWO COUNTIES, MAY OCCUR. MODELS HAVE A
PLUME OF MOISTURE COMING EITHER OVER OR VERY CLOSE TO MAUI AND
HAWAII COUNTY, BUT CONFIDENCE IS NOT THAT HIGH AT THIS TIME.
AVIATION
A WEAKENING HIGH PRESSURE RIDGE FAR NORTH OF THE STATE WILL KEEP
MODERATE TRADE WINDS IN THE FORECAST. A PASSING LOW LEVEL TROUGH
PASSING FROM EAST TO WEST ACROSS THE HAWAII REGION WILL BRING
ENHANCED CLOUDS AND SHOWER COVERAGE ACROSS THE STATE TODAY.
PERIODS OF MVFR CONDITIONS ARE EXPECTED THROUGH THE MORNING HOURS,
FAVORING NORTHERN AND EASTERN WINDWARD MOUNTAIN SLOPES OF ALL
ISLANDS.
AIRMET SIERRA IN EFFECT FOR MOUNTAIN OBSCURATION ABOVE 020 FOR
NORTH THROUGH SOUTHEAST MOUNTAINS OF KAUAI, OAHU, MOLOKAI, MAUI
AND THE BIG ISLAND. THESE CONDITIONS WILL CONTINUE WELL INTO THE
MORNING HOURS.
MARINE
MODERATE TRADE WINDS WILL PREVAIL OVER THE COASTAL WATERS FOR THE
NEXT FEW DAYS AS THE REMNANTS OF FORMER TROPICAL CYCLONE
GENEVIEVE CONTINUE LIFTING NORTHWARD, WELL EAST OF THE AREA, AND A
FRONT PASSES FROM WEST TO EAST ACROSS THE NORTH PACIFIC. WINDS
ARE EXPECTED TO REMAIN BELOW SMALL CRAFT ADVISORY LEVELS THROUGH
MUCH OF THE WEEK. TRADES ARE FORECAST TO RESTRENGTHEN TO LOCALLY
BREEZY LEVELS BY THE END OF THE WEEK AS WHAT IS LEFT OF
GENEVIEVE'S REMNANTS DISSIPATE AND HIGH PRESSURE EXPANDS NORTH OF
THE STATE.
SURF ALONG SOUTH-FACING SHORES WILL REMAIN BELOW SEASONAL AVERAGES
THROUGH MUCH OF THIS WEEK, THOUGH OCCASIONAL SMALL FLUCTUATIONS
CAN BE EXPECTED AS SMALL BACKGROUND SWELLS MOVE THROUGH. BY THIS
SATURDAY, A SMALL, LONG PERIOD SOUTH SWELL IS EXPECTED TO ARRIVE,
FOLLOWED BY A SERIES OF REINFORCING SOUTH SWELLS THAT WILL BOOST
SURF HEIGHTS TO NEAR OR ABOVE SEASONAL AVERAGES INTO NEXT WEEK.
SMALL, MEDIUM PERIOD EASTERLY SWELL GENERATED FROM FORMER TROPICAL
CYCLONE GENEVIEVE CONTINUES TO LINGER, BUT WILL GRADUALLY EASE
FOR THE NEXT COUPLE OF DAYS. CHOPPY CONDITIONS WILL REMAIN,
GENERATED BY THE MODERATE TRADE WINDS.
SURF ALONG NORTH FACING AND WEST SHORES WILL REMAIN FLAT TO TINY
THROUGH THE FORECAST PERIOD, EXCEPT FOR AREAS EXPOSED TO THE
EASTERLY TRADE WRAP.
HFO WATCHES/WARNINGS/ADVISORIES
NONE.
DISCUSSION...PARKER
AVIATION...BOHLIN
MARINE...VAUGHAN
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