Heavy Rain in Hawaii, July 9, 2008

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
1000 AM HST WED JUL 9 2008

.SYNOPSIS...
LIGHT TO LOCALLY MODERATE TRADE WINDS WILL CONTINUE WITH SEA
BREEZES FORMING OVER LEEWARD LOCATIONS IN THE AFTERNOON. RAINFALL
WILL GENERALLY BE LIGHT ALONG WINDWARD AND MAUKA AREAS WITH ISOLATED
AFTERNOON CONVECTIVE SHOWERS FOCUSED OVER SOME INTERIOR LEEWARD
ZONES.

&&

.DISCUSSION...

A SIMILAR WIND AND WEATHER PATTERN TO YESTERDAY IS ON TAP FOR
TODAY. LIGHT NORTHEAST TRADES WILL CONTINUE WITH AFTERNOON SEA
BREEZES FORMING OVER LEEWARD COASTLINES. CLOUD BUILDUPS CAN BE
EXPECTED WHERE SEA BREEZES CONVERGE WITH THE LIGHT TRADE FLOW AS
WELL AS SOME ISOLATED SHOWERS. SHOWERS FORMED YESTERDAY OVER
SOUTHWEST KAUAI...THE LEE SIDE OF HALEAKALA...AND THE SOUTHEAST
COAST OF THE BIG ISLAND WITH SOME LOCALLY HEAVY DOWNPOURS.
SOUTHWEST KAUAI HAS SEEN BRIEF HEAVY SHOWERS THE PAST TWO
AFTERNOONS...SO HAVE PLACED THE POSSIBILITY OF LOCALLY HEAVY
SHOWERS IN THE LEEWARD KAUAI ZONE FOR THIS AFTERNOON.

THE REMNANT CIRCULATION OF BORIS IS LOCATED ABOUT 475 MILES
SOUTHEAST OF SOUTH POINT ON THE BIG ISLAND AND IS MOVING JUST SOUTH
OF DUE WEST AT AROUND 6 MPH. THE MAJORITY OF ITS MOISTURE FIELD IS
EXPECTED TO SLIDE SOUTH OF THE ISLANDS. THE NORTHERN EDGE OF
MOISTURE MAY JUST CLIP PORTIONS OF BIG ISLAND AREAS THURSDAY AND
THURSDAY NIGHT WITH A POSSIBLE INCREASE SHOWER COVERAGE IF THAT
OCCURS.

MODELS ARE IN GENERAL AGREEMENT FOR THE BASIC WEATHER PATTERN FOR
THIS COMING WEEKEND. A SURFACE TROUGH IS PRESENTLY DEPICTED FAR TO
THE EAST NORTHEAST OF THE STATE. THIS IS SEEN BOTH IN THE SURFACE
MODELS AS WELL AS BY A RECENT QUICKSCAT PASS. THE GFS...UKMET...AND
THE ECMWF ALL SHOW THIS FEATURE MOVING THROUGH LATE SATURDAY INTO
SUNDAY WHILE THE NOGAPS IS A TAD SLOWER SHOWING ITS PASSAGE LATER
SUNDAY INTO MONDAY.

AFTER THE TROUGHS PASSAGE...HIGH PRESSURE WILL BUILD BACK IN FAR
NORTH OF THE STATE WITH BASICALLY A MODERATE TRADE WIND PATTERN
EXPECTED TO RETURN.

&&

.HYDROLOGY...
RAINFALL OVER THE PAST 12 HOURS ENDING AT 8 AM HAS VARIED FROM
ISLAND TO ISLAND. OVER KAUAI THE HIGHEST TOTALS WERE 0.14 INCHES AT
THE HANALEI GAGE WITH 0.12 INCHES FALLING AT THE OPAEKAA STREAM
GAGE. OVER OAHU THE HIGHEST TOTALS WERE 0.39 INCHES AT THE AHUIMANU
LOOP GAGE WITH 0.35 INCHES AT THE NUUANU UPPER GAGE. NO RAINFALL WAS
REPORTED AT ANY OF THE GAGES OVER MOLOKAI...LANAI AND KAHOOLAWE.
OVER MAUI THE HIGHEST TOTALS WERE 0.25 INCHES AT THE HANA AIRPORT
WITH 0.03 INCHES AT THE PUU KUKUI GAGE. OVER ON THE BIG ISLAND THE
HIGHEST TOTALS WERE 0.59 INCHES AT SOUTH POINT WHILE 0.05 INCHES
FELL AT THE HILO AIRPORT.

&&

.MARINE...
WINDS ARE EXPECTED TO REMAIN WELL BELOW THE SMALL CRAFT ADVISORY
CRITERIA THROUGHOUT THE FORECAST PERIOD. SEAS AROUND THE ISLANDS
WILL ALSO REMAIN WELL BELOW SMALL CRAFT ADVISORY LEVELS. IN THE SURF
DEPARTMENT...A SERIES OF SMALL SWELLS FROM THE SOUTH AND SOUTHEAST
WILL LINGER THROUGH THE WEEK AND INTO THE WEEKEND WITH HEIGHTS
REMAINING BELOW HIGH SURF ADVISORY LEVELS.

&&

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

&&

BURKE