027  
FXHW60 PHFO 040203  
AFDHFO  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE HONOLULU HI  
403 PM HST SUN AUG 3 2025  
   
SYNOPSIS
 
 
BREEZY TO LOCALLY STRONG TRADE WINDS THIS AFTERNOON WILL SLOWLY  
DECREASE THROUGH THE MIDDLE OF THE WEEK. LIGHT SHOWERS WILL RIDE  
IN WITH THE TRADE WINDS FROM TIME TO TIME, BUT OVERALL MOSTLY DRY  
CONDITIONS WILL CONTINUE THROUGH TUESDAY NIGHT. THE REMNANTS OF  
TROPICAL CYCLONE GIL WILL LIKELY PASS NORTH OF THE ISLANDS DURING  
THE MIDDLE OF THE WEEK. THIS SYSTEM WILL DISRUPT TRADE FLOW WHILE  
INCREASING STATEWIDE RAIN CHANCES.  
 

 
   
DISCUSSION
 
 
WITH 850 MB WINDS WEAKENING TODAY, WIND OBSERVATIONS ARE SHOWING A  
DOWNWARD TREND FROM LAST NIGHT. ASCAT PASS DURING THE DAY ALSO  
SHOWED LIGHTER WINDS ACROSS THE COASTAL WATERS. ALSO WITH RELATIVE  
HUMIDITIES SLOWLY RECOVERING THIS AFTERNOON, THE RED FLAG WARNING  
HAS BEEN CANCELLED ACROSS THE STATE. THE WIND ADVISORY HAS ALSO  
BEEN CANCELLED ACROSS MAUI COUNTY AND THE BIG ISLAND AND THE TRADE  
WINDS ARE NOW BACK TO OUR TYPICAL BREEZY TO LOCALLY STRONG SPEEDS  
ACROSS THE STATE.  
 
A 1030 MB HIGH REMAINS CENTERED FAR NORTH OF THE STATE WILL  
GRADUALLY WEAKEN AND DRIFT EASTWARD THE NEXT FEW DAYS. THIS WILL  
CAUSE THE BREEZY TRADE WINDS TO GRADUALLY DECREASE THROUGH THE  
MIDDLE OF THE WEEK. AFTERNOON SOUNDINGS FROM LIHUE AND HILO SHOW  
THE TRADE WIND INVERSION BETWEEN ROUGHLY 5,000 TO 6,000 FEET AND  
WILL LIKELY HOLD NEAR THESE LEVELS THROUGH TUESDAY. OVERALL,  
MOSTLY DRY AND BREEZY CONDITIONS WILL CONTINUE THROUGH MONDAY WITH  
A DECREASE OF WIND SPEEDS EXPECTED ON TUESDAY. MODERATE TRADE  
WINDS WITH MOSTLY DRY CONDITIONS ARE EXPECTED FOR TUESDAY.  
 
TRADES WILL LIKELY BECOME DISRUPTED WEDNESDAY INTO PARTS OF  
THURSDAY, AS THE REMNANTS OF GIL PASSES TO OUR NORTH. LATEST  
MODEL GUIDANCE CONTINUES TO SHOW THE MAIN BLOB OF MOISTURE  
PASSING NORTH OF HAWAII WITH ONLY SCATTERED SHOWERS EXPECTED FOR  
THE STATE OF HAWAII. VARIABLE WINDS SHOULD GIVE WAY TO SEA BREEZES  
WEDNESDAY AND THURSDAY AFTERNOONS, WHICH SHOULD ALLOW FOR SOME  
SCATTERED SHOWERS OVER LEEWARD AREAS AS WELL. WITH THE VARIABLE  
WINDS AND HIGHER DEWPOINTS (POSSIBLY LOW 70S), WARM AND HUMID  
CONDITIONS ARE ALSO EXPECTED DURING THIS TIME. BY FRIDAY, WE  
SHOULD THE THE REMNANTS OF GIL TO OUR WEST AND WE SHOULD SEE THE  
RETURN OF MODERATE TRADE WINDS.  
 

 
   
AVIATION
 
 
THIS AFTERNOON, LOCALLY STRONG TRADE WINDS ARE CONTINUING TO  
PREVAIL ACROSS THE ISLAND CHAIN, SUPPORTED BY AN AREA OF STRONG  
HIGH PRESSURE FAR NORTHEAST OF THE MAIN HAWAIIAN ISLANDS.  
THEREFORE, AIRMET TANGO REMAINS IN EFFECT FOR MODERATE TO  
ISOLATED SEVERE LOW-LEVEL TURBULENCE DOWNWIND OF ISLAND TERRAIN  
THIS AFTERNOON. HOWEVER, THE SURFACE HIGH IS FORECAST TO WEAKEN  
AND DRIFT EASTWARD BEGINNING ON MONDAY, WHICH WILL RESULT IN  
TRADES EASING OVER THE NEXT FEW DAYS. AS THE TRADE WINDS EASE,  
AIRMET TANGO WILL LIKELY BE ADJUSTED TO EXCLUDE THE MENTION OF  
ISOLATED SEVERE TURBULENCE LATER THIS AFTERNOON, AND MAY BE  
DROPPED ALTOGETHER BY MONDAY NIGHT.  
 
MEANWHILE, ISOLATED SHOWERS EMBEDDED WITHIN THE TRADE WIND FLOW  
WILL GENERALLY FAVOR NORTH THROUGH EAST SECTIONS OF THE ISLANDS.  
WITH THAT SAID, VFR FLIGHT CONDITIONS ARE EXPECTED TO PREVAIL FOR  
MOST LOCATIONS THROUGHOUT THE NEXT COUPLE OF DAYS.  
 

 
   
MARINE
 
 
HIGH PRESSURE NORTH OF THE STATE WILL WEAKEN AND DRIFT EASTWARD  
THROUGH MONDAY. TRADE WIND SPEEDS WILL GRADUALLY LOWER THROUGH THE  
MIDDLE OF THE WEEK AS THE REMNANTS OF FORMER TROPICAL CYCLONE GIL  
PASSES TO THE NORTHEAST OF THE STATE, THEN STRENGTHEN OUT OF THE  
EAST SOUTHEAST LATE THURSDAY THROUGH THE END OF THE WEEK. THE  
SMALL CRAFT ADVISORY IN EFFECT FOR ALL HAWAIIAN COASTAL WATERS  
TODAY HAS BEEN SCALED BACK TO JUST THE WINDY WATERS AROUND MAUI  
COUNTY AND THE BIG ISLAND TONIGHT THROUGH MONDAY.  
 
A MODERATE, LONG PERIOD SOUTH SWELL IS EXPECTED TO BUILD IN EARLY  
MONDAY. THIS SWELL MAY PEAK JUST BELOW HIGH SURF ADVISORY (HSA)  
CRITERIA LATE MONDAY AND INTO TUESDAY BEFORE DECLINING WEDNESDAY.  
ANOTHER SWELL IS EXPECTED FROM A LOW FORMED SOUTH OF NEW ZEALAND  
AT THE END OF JULY, THAT MEASURED SEAS OF 35 TO 40 FEET AIMED  
TOWARDS HAWAII. THIS SWELL IS EXPECTED TO BUILD ON THURSDAY AND  
HOLD THROUGH THE END OF THE WEEK WHICH COULD GET NEAR HSA CRITERIA  
AT ITS PEAK.  
 
SHORT PERIOD TRADE WIND SWELL WILL KEEP EAST FACING SHORES ELEVATED  
AND CHOPPY THROUGH MONDAY DUE TO STRONG TRADE WINDS. BY LATE  
MONDAY INTO TUESDAY, A MODERATE, MEDIUM TO LONG PERIOD EAST SWELL  
IS EXPECTED TO FILL IN FROM THE ENERGY FROM FORMER TROPICAL  
CYCLONE GIL.  
 
A SMALL, MEDIUM PERIOD NORTHWEST SWELL ORIGINATING FROM TYPHOON  
KROSA IN THE WESTERN PACIFIC WILL BRING A SMALL BUMP UP IN SURF  
ALONG NORTH FACING SHORES THIS EVENING AND HOLD THROUGH MONDAY.  
ANOTHER BUMP IS EXPECTED AS A SMALL, MEDIUM TO LONG PERIOD  
NORTHWEST SWELL LOOKS TO FILL IN THURSDAY AND FRIDAY.  
 

 
   
FIRE WEATHER
 
 
RELATIVE HUMIDITIES ARE NOW SLOWLY RECOVERING THIS AFTERNOON AND  
WINDS HAVE EASED JUST ENOUGH TO FALL BELOW RED FLAG THRESHOLDS.  
THUS THE RED FLAG WARNINGS HAVE BEEN CANCELLED. ALTHOUGH WARNINGS  
HAVE BEEN CANCELLED, DRY CONDITIONS WILL CONTINUE TO PERSIST WITH  
BREEZY TRADES ON MONDAY BECOMING MODERATE TRADES ON TUESDAY. THE  
TRADE WIND INVERSION WILL CONTINUE TO HOLD STRONG BETWEEN 5000 TO  
6000 FEET WITH VERY LOW RELATIVE HUMIDITY CONTINUING ALONG THE  
UPPER ELEVATIONS OF HALEAKALA ON MAUI AND THE MID TO UPPER SLOPES  
OF THE BIG ISLAND. WITH THE ADDED STRESS ON VEGETATION THE PAST  
SEVERAL DAYS COMBINED WITH THE PERSISTENT DRY CONDITIONS, ELEVATED  
FIRE WEATHER CONCERNS WILL CONTINUE THROUGH TUESDAY NIGHT. AN  
INCREASE OF MOISTURE AND SHOWER ACTIVITY WILL BE POSSIBLE TOWARDS  
THE MIDDLE OF THE WEEK AS THE REMNANTS OF TC GIL PASSES TO OUR  
NORTH. ALTHOUGH RAINFALL AMOUNTS MAY BE LOW, HUMIDITIES SHOULD BE  
RELATIVELY HIGH WEDNESDAY AND THURSDAY INCLUDING THE HIGHER  
ELEVATIONS.  
 

 
   
HFO WATCHES/WARNINGS/ADVISORIES
 
 
SMALL CRAFT ADVISORY UNTIL 6 PM HST MONDAY FOR MAALAEA BAY-  
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG  
ISLAND SOUTHEAST WATERS.  
 

 
 

 
 
DISCUSSION...KINO  
AVIATION...VAUGHAN  
MARINE...FOSTER  
FIRE WEATHER...KINO  
 
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