High Surf in Hawaii, April 21 to 23, 2003

HAWAIIAN ISLANDS SYNOPTIC DISCUSSION AND GUIDANCE
NATIONAL WEATHER SERVICE HONOLULU HI
10 AM HST MON APR 21 2003

SUMMARY...A HIGH NORTH OF THE ISLANDS WILL MAINTAIN BREEZY TRADE
WINDS THROUGH WEDNESDAY. THE TRADES WILL START WEAKENING THURSDAY AS
THE HIGH MOVES AWAY TO THE NORTHEAST. TROUGHING ALOFT WILL ENHANCE
THE TRADE WIND SHOWERS THROUGH THE WEEK.

DISCUSSION...A LARGE SURFACE HIGH NORTH NORTHEAST OF THE ISLANDS
WILL BE REPLACED BY ANOTHER LARGE HIGH NORTH NORTHWEST OF THE
ISLANDS TOMORROW. THIS HIGH PRESSURE WILL MAINTAIN 15 TO 30 MPH
WINDS THROUGH WEDNESDAY. ON THURSDAY THE TRADES WILL START TO WEAKEN
AS A TROUGH DIGS TOWARDS THE ISLANDS FROM THE NORTHWEST AND THE HIGH
STARTS MOVING AWAY TO THE NORTHEAST.

A TROUGH AT MID AND UPPER LEVELS WILL REMAIN OVER THE MAIN HAWAIIAN
ISLANDS THROUGH THE WEEK. THIS WILL CREATE SOME INSTABILITY OVER THE
ISLANDS...ESPECIALLY BEGINNING WEDNESDAY AFTERNOON WHEN THE TROUGH
WILL DEEPEN...BUT SO FAR THE MODELS SHOW ONLY MODEST ENHANCEMENT OF
THE TRADE SHOWERS.

MORNING SURF REPORTS SHOWED THE SOUTH SWELL HAS DROPPED BELOW
ADVISORY LEVELS SO THE HIGH SURF ADVISORY WAS CANCELLED AT 945 AM
HST. A NORTH SWELL WILL REACH THE ISLANDS WEDNESDAY NIGHT BUT WILL
REMAIN WELL BELOW ADVISORY LEVELS. A NEW SOUTH SWELL NEXT WEEKEND
MAY BE NEAR ADVISORY LEVELS.
DONALDSON

.HFO...WATCHES......NONE
.      WARNINGS.....NONE
.      ADVISORIES...SMALL CRAFT ALL WATERS
.                   HIGH SURF SOUTH SHORES CANCELLED AT 945 AM HST