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AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
1000 AM HST SUN APR 26 2015

.SYNOPSIS...
A WEAKENING FRONT WILL MOVE ACROSS OAHU LATER TODAY AND DISSIPATE 
OVER MAUI COUNTY ON MONDAY. SOME PASSING SHOWERS WILL ACCOMPANY THE 
FRONT. HIGH PRESSURE WILL BUILD IN NORTH OF THE AREA THIS WEEK WITH 
TRADE WINDS BECOMING RATHER BREEZY. ABUNDANT CLOUD COVERAGE AND 
OCCASIONAL SHOWERS WILL OCCUR OVER WINDWARD AND MAUKA AREAS WITH THE 
TRADE WINDS SUFFICIENTLY STRONG TO BLOW SOME PASSING SHOWERS OVER TO 
SOME LEEWARD LOCATIONS. 

&&

.DISCUSSION...
A WEAKENING FRONTAL BAND IS PRESENTLY CENTERED ACROSS THE KAUAI 
CHANNEL. RADAR AND SATELLITE IMAGERY SHOWS THE FRONT IS MOVING VERY 
SLOWLY TOWARD THE EAST AT THE PRESENT TIME. UPPER LEVEL SUPPORT IS 
LACKING IN THE ISLAND VICINITY SO MAINLY LIGHT SHOWERS ARE 
ACCOMPANYING THE FRONT WITH A FEW EMBEDDED MODERATE SHOWERS EMBEDDED 
ALONG IT. THERE ARE ALSO A FEW PASSING SHOWERS SEEN OUT AHEAD OF THE 
FRONT BUT THESE ARE RATHER LIGHT AND ISOLATED. THE FRONT WILL 
GRADUALLY SPREAD OVER OAHU TODAY ACCOMPANIED BY SOME PASSING 
SHOWERS. WEATHER SHOULD IMPROVE OVER MOST OF THE KAUAI THIS 
AFTERNOON. THE FRONT WILL THEN SPREAD OVER MAUI COUNTY TONIGHT AND 
MONDAY WITH MAINLY LIGHT SHOWERS ACCOMPANYING IT. IT IS THEN 
FORECAST TO DISSIPATE NEAR MAUI MONDAY NIGHT AND TUESDAY. 

STRONG HIGH PRESSURE WILL BE BUILDING IN TO OUR NORTH IN THE FRONTS 
WAKE. TRADE WINDS WILL PICK UP AND BECOME RATHER FOR MOST OF THIS 
WEEK. LEFTOVER MOISTURE FROM THE DISSIPATED FRONT WILL LINGER ACROSS 
THE AREA AND OVER THE WATERS TO OUR EAST. ALSO THE WESTERN END OF A 
MID LEVEL TROUGH WILL LINGER NEAR THE BIG ISLAND. THE COMBINATION OF 
THE STRONGER TRADE WINDS AND ABUNDANT LOW LEVEL MOISTURE WILL CAUSE 
A WET TRADE WIND WEATHER PATTERN TO SET UP FOR THE NEXT FEW DAYS. 
WINDWARD AND MAUKA AREAS WILL EXPERIENCE THE GREATEST AMOUNT OF 
SHOWER ACTIVITY BUT THE TRADE WINDS WILL BE SUFFICIENTLY STRONG 
ENOUGH TO BLOW SOME PASSING SHOWERS OVER TO LEEWARD AREAS AT TIMES. 

AS THE HIGH MOVES OFF TO THE NORTHEAST AND WEAKENS LATER IN THE 
WEEK...TRADE WINDS WILL GRADUALLY DROP OFF JUST A BIT WITH A DRYING 
TREND EXPECTED AS WELL. 

&&

.MARINE...
A NEW NORTHERLY SWELL IS EXPECTED TO BEGIN ARRIVING LATER TODAY. 
THIS SWELL WILL GRADUALLY TONIGHT AND MONDAY WITH SURF HEIGHTS 
EXPECTED TO REACH LOW END ADVISORY LEVELS ALONG NORTH AND EAST 
FACING SHORELINES. THIS SWELL WILL LINGER ON INTO TUESDAY AND LOWER 
GRADUALLY ON WEDNESDAY. STRENGTHENING TRADE WINDS WILL KEEP SHORT 
PERIOD CHOPPY SURF ELEVATED ALONG EAST FACING SHORES THROUGH MOST OF 
THE WEEK. 

STRONG HIGH PRESSURE BUILDING IN TO THE NORTH WILL CAUSE AN INCREASE 
IN TRADE WINDS OVER THE AREA THROUGH MOST OF THE WEEK. WINDS AND 
SEAS WILL EXCEED SMALL CRAFT ADVISORY THRESHOLDS ACROSS MOST OF THE 
AREA BY MONDAY MORNING. 

&&

.AVIATION...
A COLD FRONT WILL CONTINUE TO EDGE SLOWLY SOUTHEASTWARD THROUGH THE 
ISLAND CHAIN TODAY...PUSHING THROUGH OAHU LATE THIS AFTERNOON OR 
EARLY THIS EVENING AND MAUI COUNTY TONIGHT. UNSETTLED WEATHER CAN BE 
EXPECTED AS THE FRONT MOVES THROUGH WITH OCCASIONAL MVFR CIGS/VSBYS 
AT THE TERMINALS...WITH ISOLATED IFR CONDITIONS POSSIBLE. BEHIND 
THE COLD FRONT WINDS WILL PICK UP OUT OF THE NORTHEAST AS THE 
TRADES KICK BACK IN.

AIRMET SIERRA IS IN EFFECT FOR MOUNTAIN OBSCURATION ON OAHU AND 
KAUAI. CONDITIONS SHOULD IMPROVE ON KAUAI OVER THE NEXT SEVERAL 
HOURS...BUT MOUNTAIN OBSCURATION WILL LIKELY CONTINUE OVER OAHU 
THROUGH THIS EVENING. THESE CONDITIONS WILL LIKELY SPREAD DOWN THE 
ISLAND CHAIN INTO MAUI COUNTY TONIGHT.

AIRMET TANGO MAY BECOME NECESSARY LATER TODAY AND TONIGHT ACROSS 
THE NORTHERN ISLANDS DUE TO MODERATE LOW LEVEL TURB AS THE TRADE 
WINDS PICK UP.  

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

$$

SYNOPSIS/DISCUSSION/MARINE...BURKE
AVIATION...JELSEMA



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