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Hawaiian Islands Synoptic Discussion and Guidance
595
FXHW60 PHFO 241331
AFDHFO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
330 AM HST FRI MAY 24 2013
.SYNOPSIS...
TRADE WINDS WILL STRENGTHEN AND PREVAIL ACROSS THE MAIN HAWAIIAN
ISLANDS...WITH PERIODS OF LOCALLY BREEZY CONDITIONS. SHOWERS WILL
FAVOR WINDWARD AND MOUNTAIN AREAS. THE TRADE WIND PATTERN IS
EXPECTED TO PREVAIL THROUGH EARLY NEXT WEEK.
&&
.DISCUSSION...
A BROAD SFC HIGH PRESSURE SYSTEM CENTERED FAR NE OF THE ALOHA STATE
WILL KEEP TRADE WINDS ACROSS THE MAIN HAWAIIAN ISLANDS DURING
THE NEXT SEVERAL DAYS. MEANWHILE...WV SATELLITE IMAGERY SHOWS AN
UPPER LVL TROUGH FAR N OF THE ISLAND CHAIN...WHICH IS SLOWLY
MIGRATING E AND ALLOWING FOR PRESSURE GRADIENTS ALOFT TO BECOME
MORE RELAXED. WIND SPEEDS OVER THE BIG ISLAND SUMMITS ARE NOW BELOW
ADVISORY LEVELS AND SHOULD REMAIN SO FOR THE REST OF THE FORECAST
PERIOD. THEREFORE...THE WIND ADVISORY HAS BEEN CANCELLED.
THE GLOBAL MODELS REMAIN IN FAIR AGREEMENT...SHOWING THE TROUGH
ALOFT MIGRATING INTO THE EPAC AND ALLOWING FOR UPPER LVL RIDGING TO
BUILD TO THE N/NW OF THE ISLANDS. AT THE SFC...THE HIGH WILL
CONTINUE TO EXPAND ACROSS THE N CPAC AND BRINGING STRONGER TRADES
THROUGH THE WEEKEND. LOCALLY BREEZY CONDITIONS WILL BEGIN DEVELOPING
TODAY...AND CONTINUING THROUGH THE REST OF THE HOLIDAY WEEKEND AND
INTO EARLY NEXT WEEK.
AS THE TRADE WIND PATTERN ESTABLISHES ACROSS THE ISLANDS...THE
FOCUS FOR SHOWER ACTIVITY WILL SHIFT TO WINDWARD AND MAUKA AREAS.
LINGERING MOISTURE AND DAYTIME HEATING INSTABILITY WILL KEEP CHANCES
FOR MORE ACTIVE TRADE SHOWERS TODAY AND TONIGHT.
&&
.AVIATION...
THE HAWAII TERMINALS WILL REMAIN MAINLY VFR WITH ISOLATED MVFR
CEILINGS AND VIS OVER WINDWARD AREAS. AS THE TRADE
WINDS STRENGTHEN...MODERATE LOW LEVEL TURBULENCE MAY DEVELOP
TODAY AND REQUIRE AN AIRMET.
&&
.MARINE...
THE S SWELL WILL KEEP DECREASING WITH SURF ALONG S SHORES REMAINING
BELOW ADVISORY LEVELS DURING THE NEXT SEVERAL DAYS. THE NW SWELL
WILL GRADUALLY DIMINISH THROUGH THE WEEKEND.
THE TRADES WILL REACH SMALL CRAFT ADVISORY LEVELS OVER THE WINDIER
LOCATIONS NEAR MAUI COUNTY AND THE BIG ISLAND TODAY. THEREFORE...A
SMALL CRAFT ADVISORY IS IN EFFECT FOR THOSE MARINE ZONES THROUGH
SUNDAY.
&&
.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 AM HST SUNDAY FOR THE WINDIER WATERS
AROUND MAUI COUNTY AND THE BIG ISLAND.
&&
$$
DISCUSSION/MARINE...REYNES
AVIATION...MORRISON
Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office
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It was last modified on: Tue, Sep 21 2010 - 2314 UTC
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