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Hawaiian Islands Synoptic Discussion and Guidance

404
FXHW60 PHFO 230138
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
400 PM HST FRI AUG 22 2014

.SYNOPSIS...
A TRADE WIND WEATHER PATTERN CAN BE EXPECTED OVER THE NEXT SEVERAL
DAYS AS HIGH PRESSURE REMAINS CENTERED FAR TO THE NORTH OF THE
STATE. CLOUDS AND PASSING SHOWERS WILL TEND TO FAVOR WINDWARD AND
MAUKA AREAS WITH A FEW SHOWERS POSSIBLE OVER SOME LEEWARD
LOCATIONS. WINDS ARE EXPECTED TO BECOME LIGHTER NEXT WEEK AS THE
HIGH WEAKENS TO OUR NORTH.

&&

.DISCUSSION...
AN AREA OF SHOWERY LOW CLOUDS IS PRESENTLY MOVING THROUGH THE
ISLANDS FROM THE EAST PROVIDING FOR SOME SCATTERED SHOWERS OVER
WINDWARD AND MAUKA AREAS WITH THE TRADE WINDS SUFFICIENTLY STRONG
ENOUGH TO BLOW A FEW SHOWERS OVER TO SOME LEEWARD LOCATIONS OF THE
SMALLER ISLANDS AT TIMES.

AN AREA OF HIGH PRESSURE IS EXPECTED TO PERSIST FAR TO THE NORTH
OF THE STATE FOR THE NEXT SEVERAL DAYS. THIS WILL KEEP THE ISLANDS
IN A TRADE WIND PATTERN. HOWEVER THE HIGH IS EXPECTED TO WEAKEN A
BIT LATER THIS WEEKEND AND ON INTO NEXT WEEK RESULTING IN A SLIGHT
DROP OFF IN TRADE WIND SPEEDS. THE HIGH MAY WEAKEN EVEN FURTHER
LATER IN THE WEEK WITH LAND AND SEA BREEZES BECOMING MORE OF A
POSSIBILITY.

MOISTURE EMBEDDED IN THE TRADES WILL CONTINUE TO PRODUCE SCATTERED
SHOWERS FOR WINDWARD AND MAUKA LOCATIONS WITH JUST A FEW SHOWERS
POSSIBLE OVER SOME LEEWARD LOCATIONS AS WELL.

&&

.AVIATION...
AREAS OF SHOWERY AND STABLE LOW CLOUDS MOVING OVER THE ISLANDS
WITHIN THE TRADE WIND FLOW WILL BRING PERIODS OF MVFR VIS/CIG IN
SHRA TO WINDWARD SLOPES...COASTS AND WATERS. SOME OF THE SHRA WILL
OCCASIONALLY SPREAD LEEWARD ON THE SMALLER ISLANDS. WHILE VFR
CONDITIONS WILL PREVAIL AT THE TERMINALS...BRIEF MVFR VIS/CIG ARE
POSSIBLE AT PHTO...PHNY...PHMK AND PHOG. NO AIRMETS ARE IN EFFECT.

&&

.MARINE...
A SMALL CRAFT ADVISORY IS IN EFFECT FOR THE USUAL WINDY WATERS
AROUND MAUI COUNTY AND THE BIG ISLAND THROUGH TONIGHT. WINDS ARE
EXPECTED TO DROP OFF JUST A BIT OVER THE WEEKEND AND ON INTO EARLY
NEXT WEEK.

A HIGH SURF ADVISORY REMAINS IN EFFECT FOR SOUTH FACING SHORES. THIS
SWELL WILL GRADUALLY LOWER LATER TONIGHT AND SATURDAY. A SERIES OF
MODERATE SIZE SOUTH SWELL ARE EXPECTED OVER THE NEXT SEVERAL DAYS
WITH A SLIGHTLY LARGER SWELL POSSIBLE WEDNESDAY AND THURSDAY. THE
COMBINATION OF EASTERLY TRADE WINDS AND SWELLS FROM DISTANT TROPICAL
CYCLONES WILL CONTINUE TO PRODUCE MODERATE SIZE SURF ALONG EAST
FACING SHORES THROUGH THE WEEKEND AND ON THROUGH THE MIDDLE OF NEXT
WEEK.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
HIGH SURF ADVISORY UNTIL 6 AM HST SATURDAY FOR NIIHAU-KAUAI
WINDWARD-KAUAI LEEWARD-OAHU SOUTH SHORE-WAIANAE COAST-MOLOKAI
LEEWARD-LANAI-KAHOOLAWE-MAUI LEEWARD WEST-MAUI CENTRAL VALLEY-
LEEWARD HALEAKALA-KONA-SOUTH BIG ISLAND-KOHALA.

SMALL CRAFT ADVISORY UNTIL 6 AM HST SATURDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND SOUTHEAST WATERS.

&&

$$

SYNOPSIS/DISCUSSION/MARINE...BURKE
AVIATION...BIRCHARD



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