008  
FXHW60 PHFO 130115  
AFDHFO  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE HONOLULU HI  
315 PM HST SAT JUL 12 2025  
   
SYNOPSIS  
 
HIGH PRESSURE WELL NORTHEAST OF THE ISLANDS WILL MAINTAIN  
MODERATE TO LOCALLY BREEZY TRADE WINDS THROUGH MUCH OF THE WEEK.  
EXPECT PASSING CLOUDS AND SHOWERS TO FAVOR WINDWARD AND MAUKA  
AREAS, WITH A SLIGHT UPTICK IN SHOWER ACTIVITY MONDAY AND  
TUESDAY.  
 
 
   
DISCUSSION  
 
MODERATE TO LOCALLY BREEZY TRADE WINDS BROUGHT A SHALLOW BAND OF  
MOISTURE OVER THE ISLANDS TODAY. AN UPPER-LEVEL LOW DRIFTING  
SEVERAL HUNDRED MILES NORTH OF THE STATE PRODUCED SOME ENHANCEMENT  
OF SHOWERS WITHIN THE MOISTURE BAND NEAR KAUAI, WHERE MANY  
WINDWARD SITES RECEIVED OVER A HALF OF AN INCH OF RAINFALL TODAY.  
PRECIPITATION WAS MORE SUBDUED ELSEWHERE, GENERALLY LESS THAN A  
QUARTER OF AN INCH. TRADE WINDS WILL PUSH THE BAND WESTWARD  
TONIGHT AND ALLOW DRIER AIR TO SPREAD TO AT LEAST OAHU, WHILE  
HIGHER CHANCES OF RAINFALL LINGER ON WINDWARD KAUAI.  
 
TRADE WINDS WILL REMAIN IN THE MODERATE TO LOCALLY BREEZY RANGE ON  
SUNDAY AS HIGH PRESSURE HOLDS FAR NORTHEAST OF THE STATE, AND  
SOMEWHAT DRY CONDITIONS WILL PREVAIL AS PRECIPITABLE WATER VALUES  
FALL BELOW SEASONAL NORMAL. EXPECT MODEST SHOWERS TO BE CONFINED  
TO WINDWARD AREAS, AND WITH THE EXCEPTION OF A FEW AFTERNOON  
SHOWERS ON THE KONA SLOPES OF THE BIG ISLAND, LEEWARD AREAS WILL  
BE RATHER DRY.  
 
ANOTHER AREA OF ENHANCED MOISTURE WILL PASS OVER THE ISLANDS  
MONDAY AFTERNOON INTO TUESDAY. THE UPPER-LEVEL LOW CURRENTLY NEAR  
THE STATE WILL RETREAT NORTHWARD, AND A BUILDING MID-LEVEL RIDGE  
WILL BRING STABLE CONDITIONS. TRADE WINDS WILL BE SLIGHTLY WEAKER  
AND MORE EASTERLY THAN USUAL, WHICH COULD KEEP THE BULK OF THE  
MOISTURE JUST NORTH OF THE ISLANDS. REGARDLESS, EXPECT AN  
INCREASE IN SHOWERS ON WINDWARD BIG ISLAND MIDDAY MONDAY,  
SPREADING THE CENTRAL ISLANDS MONDAY NIGHT, THEN PUSHING WESTWARD  
TO KAUAI AND OAHU ON TUESDAY.  
 
TUESDAY EVENING THROUGH THE REST OF THE COMING WEEK, TYPICAL  
SUMMERTIME TRADE WIND WEATHER IS EXPECTED TO LARGELY CONFINE  
RAINFALL TO WINDWARD AREAS. THE NORTHEAST PACIFIC HIGH MAY DRIFT  
CLOSER TO THE STATE, LEADING TO A SLIGHT UPTICK IN TRADE WINDS.  
 
 
   
AVIATION  
 
MODERATE TRADES WILL PERSIST THROUGH THE WEEKEND. CLOUDS AND  
SHOWERS WILL GENERALLY FAVOR WINDWARD AND MOUNTAIN AREAS ACROSS  
ALL ISLANDS AND MAY RESULT IN MVFR CONDITIONS AT TIMES. LOW CLOUDS  
AND SHOWERS WILL LIKELY PERSIST FOR WINDWARD AREAS OF MOST ISLANDS  
THROUGH THE AFTERNOON AND EVENING AS A BAND OF MOISTURE MOVES  
THROUGH THE ISLAND CHAIN FROM THE EAST. OTHERWISE, VFR CONDITIONS  
WILL GENERALLY PREVAIL.  
 
AIRMET SIERRA IS IN EFFECT FOR MOUNTAIN OBSCURATION FOR THE  
WINDWARD AREAS OF THE BIG ISLAND FROM UPOLU POINT AROUND CAPE  
KUMUKAHI TO APUA POINT DUE TO A LINE OF SHOWERY LOW CLOUDS MOVING  
THROUGH. CONDITIONS MAY IMPROVE OVER BIG ISLAND BY THIS EVENING.  
ADDITIONAL ISLANDS MAY NEED TO BE ADDED TO THE AIRMET LATER.  
 
 
   
MARINE  
 
HIGH PRESSURE FAR NORTHEAST OF THE HAWAIIAN WATERS WILL HELP  
DRIVE MODERATE TO LOCALLY FRESH TRADES ACROSS THE REGION THROUGH  
MONDAY. HOWEVER, WINDS MAY BRIEFLY STRENGTHEN BACK TO LOCALLY  
STRONG SPEEDS TOMORROW BETWEEN THE PASSAGE OF A WEAK SURFACE  
TROUGH ACROSS THE ISLAND CHAIN THIS AFTERNOON AND ANOTHER ONE ON  
MONDAY. THEN AS THIS SECOND WEAK TROUGH EXITS THE AREA AND THE  
HIGH TO THE FAR NORTHEAST GRADUALLY STRENGTHENS EARLY NEXT WEEK,  
TRADE WINDS WILL INCREASE BACK TO MODERATE TO LOCALLY STRONG  
LEVELS.  
 
SURF ALONG SOUTH FACING SHORES WILL REMAIN SMALL THROUGH THE  
WEEKEND. A SMALL, LONG PERIOD SOUTH SWELL WILL ARRIVE SUNDAY  
NIGHT INTO MONDAY MORNING AND PEAK LATE MONDAY INTO TUESDAY. THEN  
A MIX OF THIS FADING SOUTH SWELL AND A REINFORCING SMALL SOUTH-  
SOUTHEAST SWELL SHOULD PROVIDE NEAR OR SLIGHTLY BELOW SUMMER  
AVERAGE SURF THROUGH MIDWEEK.  
 
WIND WAVE DRIVEN SURF HEIGHTS ALONG EAST FACING SHORES WILL  
REMAIN ON THE SMALL AND CHOPPY SIDE THROUGH TUESDAY, THEN  
INCREASE SLIGHTLY AS TRADE WIND SPEEDS PICKUP BY WEDNESDAY. A VERY  
SMALL NORTHWEST SWELL MAY PASS THROUGH EARLY NEXT WEEK, PROVIDING  
TINY SURF ALONG NORTH FACING SHORES ON MONDAY AND TUESDAY BEFORE  
BECOMING NEARLY FLAT THROUGH THE REMAIN FORECAST PERIOD.  
 
 
   
FIRE WEATHER  
 
TRADE WINDS WILL REMAIN IN THE MODERATE TO LOCALLY BREEZY RANGE  
FOR THE NEXT SEVERAL DAYS. WHILE THE ATMOSPHERE WILL BE RATHER  
DRY ON SUNDAY THROUGH EARLY MONDAY, EXPECT TYPICAL SUMMERTIME FIRE  
WEATHER CONDITIONS. HIGHER HUMIDITY IS FAVORED LATE MONDAY INTO  
TUESDAY, FOLLOWED BY A RETURN TO DRIER AND TYPICAL SUMMERTIME  
CONDITIONS LATE TUESDAY AND WEDNESDAY.  
 
 
   
HFO WATCHES/WARNINGS/ADVISORIES  
 
NONE.  
 
 
 
 
 
DISCUSSION...WROE  
AVIATION...TS  
MARINE...FARRIS/KINO  
FIRE WEATHER...WROE  
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