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WindESE 20 mph
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Hawaiian Islands Synoptic Discussion and Guidance

735
FXHW60 PHFO 192019
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
1019 AM HST SAT APR 19 2014

.SYNOPSIS...
BREEZY TRADE WINDS WILL CONTINUE THROUGH THE WEEK WITH SHOWERS
FOCUSING OVER THE WINDWARD SLOPES. LEEWARD AREAS OF THE SMALLER
ISLANDS WILL SEE A FEW SHOWERS IN THE EARLY MORNING AND LATE
AFTERNOON.

&&

.DISCUSSION...
HIGH PRESSURE NORTH OF THE STATE IS PROVIDING STEADY TRADE WINDS
ACROSS THE ISLANDS TODAY. WINDWARD SHOWERS ARE BRINGING CLOUDS AND
LIGHT RAINFALL ALONG THE WINDWARD SLOPES. TRADE WINDS WILL CONTINUE
THROUGH THE FORECAST PERIOD WITH AN UPTICK IN WINDS AND SHOWERS
EXPECTED SUNDAY THROUGH TUESDAY.

HIGH PRESSURE MOVING IN FROM THE WEST WILL BUILD NORTH OF HAWAII
TONIGHT AND SUNDAY. THE PRESSURE GRADIENT WILL TIGHTEN FROM N TO S
ACROSS THE AREA AS THE HIGH BUILDS...AND WINDS WILL INCREASE IN
RESPONSE. A WIND ADVISORY MAY BE NECESSARY ACROSS THE WINDIER
AREAS OF THE BIG ISLAND AND MAUI COUNTY SUNDAY AS THE WINDS
INCREASE. TUESDAY...THE HIGH WILL PUSH TOWARD THE EAST PACIFIC
AS A WEAK FRONT MOVES ACROSS THE DATELINE. WINDS OVER THE STATE
WILL DECREASE TO MODERATE TRADES AS THE HIGH MOVES INTO THE EAST
PACIFIC FOR THE SECOND HALF OF THE WEEK.

CURRENT PRECIPITABLE WATER VALUES ARE BELOW NORMAL NEAR THE
ISLANDS AND SHOWERS HAVE BEEN LIMITED. THE MIMIC PRECIP WATER
FIELD SHOWS AN INCREASE IN MOISTURE UPSTREAM OF THE ISLANDS NEAR
150W AND 24N. THIS MOISTURE IS EXPECTED TO INCREASE WINDWARD
SHOWERS TONIGHT THROUGH TUESDAY NIGHT AS THE MOISTURE MOVES ACROSS THE
AREA.


&&


.AVIATION...
TRADE WIND FLOW CONTINUES...RESULTING IN AIRMET TANGO FOR TURBULENCE
TO THE LEE OF THE ALL ISLANDS. TRADES ARE EXPECTED TO INCREASE THROUGH
THE WEEKEND...SO EXPECTING THE AIRMET TO CONTINUE.

CLOUDS AND SHOWERS BEING CARRIED IN ON THE TRADES WILL BRING MVFR
CONDITIONS MAINLY TO WINDWARD AND MAUKA AREAS FROM TIME TO
TIME...AND ISOLATED IFR CONDITIONS ARE POSSIBLE. OTHERWISE VFR
CONDITIONS ARE EXPECTED TO PREVAIL OVER LEEWARD AREAS.


&&

.MARINE...
THE SMALL CRAFT ADVISORY COVERS ALL HAWAIIAN COASTAL WATERS DUE TO
SEAS AND WINDS. WINDS SHOULD ONLY INCREASE FURTHER WITH TIME AS HIGH
PRESSURE BUILDS TO OUR NORTH...AND THE SCA EXTENDS THROUGH
MONDAY. WINDS MAY REACH NEAR GALE FORCE AT TIMES SUNDAY THROUGH
MONDAY IN THE ALENUIHAHA CHANNEL.

A SMALL TO MODERATE NORTHWEST SWELL WILL BUILD LATER TODAY AND
TONIGHT...THEN DECLINE SUNDAY EVENING. ANOTHER MODERATE NORTHWEST
SWELL IS EXPECTED NEXT WEDNESDAY NIGHT AND WILL CONTINUE THROUGH
THE END OF NEXT WEEK. STRENGTHENING TRADE WINDS WILL PRODUCE SHORT
PERIOD...CHOPPY SURF ALONG EAST FACING SHORES...LIKELY REACHING
ADVISORY LEVELS ON EAST FACING SHORES BY LATE SUNDAY OR MONDAY.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST MONDAY FOR ALL HAWAIIAN
WATERS-


&&

$$

MORRISON...DISCUSSION/MARINE
M BALLARD...AVIATION




Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office