High Surf Advisory 2, NWS Honolulu, HI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
800 PM HST THU JAN 17 2013

.SYNOPSIS...
A RATHER COOL...DRY AIR MASS WILL CONTINUE ACROSS THE AREA INTO THE
WEEKEND. THIS AIR MASS WILL BE REENFORCED AFTER A COLD FRONT
DISSIPATES OVER THE ISLANDS FRIDAY AFTERNOON AND FRIDAY NIGHT.
A STRONG AND GUSTY TRADE REGIME WILL SETTLE OVER THE ISLANDS BY
MONDAY AND PERSIST THROUGH AT LEAST MID WEEK OF NEXT WEEK.

&&

.DISCUSSION...

A LIGHT NORTHWEST TO NORTHERLY WIND FLOW CURRENTLY COVERS THE
ISLANDS. THE CLOUD COVER...FROM A VERY WEAK FRONT...IS SLOW TO
DISSIPATE BUT IS TRYING HARD TO CLEAR KAUAI AND OAHU. SO IF THIS
CLEARING TREND CONTINUES...THESE TWO ISLANDS IN PARTICULAR...MAY
RADIATE OUT TONIGHT...WITH MINS REACHING JUST AS COOL...OR COLD...
FROM TWO NIGHTS AGO.

ANOTHER WEAK COLD FRONT IS SLATED TO DISSIPATE AS IT MOVES DOWN THE
ISLAND CHAIN TOMORROW...FRIDAY...REACHING KAUAI AROUND MID
AFTERNOON...OAHU AND MAUI COUNTY IN THE EVENING...MAUI...AND THE BIG
ISLAND AROUND MIDNIGHT FRIDAY NIGHT. THERE WILL BE A FEW SHOWERS
WITH THIS FRONT BUT NOT A WHOLE LOT AND NOTHING HEAVY. BEHIND THE
FRONT...A NORTHERLY WIND FLOW WILL USHER IN A SLIGHTLY COOLER AIR
MASS...AND IN A WAY...RE ENFORCE THE AIR MASS WE ARE ALREADY IN.

THE NORTHERLY WINDS WILL BE LIGHT TO MODERATE IN STREGTH...GENERATED
BY A 1019 MB HIGH PRESSURE SYSTEM NORTHWEST OF KAUAI. THIS HIGH WILL
STRENGTHEN AS IT EASES SLOWLY EASTWARD THROUGH THE WEEKEND...PASSING
NORTH OF THE ISLANDS MONDAY. IN DOING SO...THE LOW LEVEL WINDS WILL
VEER TO THE NORTHEAST AND GAIN STRENGTH TO MODERATE TO LOCALLY
STRONG. BY TUESDAY...THE HIGH OF 1025 MB...LOCATED FAR NORTHEAST OF
THE ISLANDS WILL BE GENERATING MODERATE TO STRONG TRADES ACROSS THE
AREA. THE OVERNIGHT TEMPS OVER THE WEEKEND ARE SLATED TO BE COOL AND
CHILLY BUT NOT AS COLD SINCE THE WIND WILL BE BLOWING...PERHAPS IN
THE 60/S. AS THE WINDS VEER MORE TO THE EAST...EXPECT THE MINS TO
TURN WARMER...FROM THE 60S TO LOW 70S.

THE BREEZY TRADE WINDS WILL CONTINUE THROUGH MID WEEK OF NEXT WEEK
WITH NIGHT AND MORNING SHOWERS FAVORING THE WINDWARD AND MOUNTAIN
AREAS.

THE WINDS ATOP THE BIG ISLAND SUMMITS ARE STILL WINDY...30 TO 40
MPH SUSTAINED...THUS THE WIND ADVISORY CONTINUES. THE ADVISORY IS
EFFECTIVE UNTIL 6 PM HST FRIDAY.
&&

.AVIATION...
LIGHT WINDS ARE EXPECTED TO CONTINUE THROUGH TONIGHT. VFR CONDITIONS
SHOULD ALSO PERSIST ACROSS THE STATE THROUGH FRIDAY MORNING. A
SURFACE FRONT MOVING DOWN FROM THE NORTHWEST MAY PRODUCE BRIEF MVFR
CONDITIONS DUE TO LOWER CEILINGS IN LOW CLOUDS AND -SHRA ACROSS
PARTS OF KAUAI...AND POSSIBLY OAHU...FRIDAY AFTERNOON.

&&

.MARINE...
THE BIG NEWS IS THE UNUSUALLY LARGE...LONG PERIOD NORTHWEST SWELL
WHICH HAS WARRANTED WARNING LEVEL SURF TO NORTH AND WEST FACING
SHORES OF MOST ISLANDS TONIGHT. THE WARNING LEVEL SURF IS EXPECTED
TO LAST THROUGH SUNDAY.

THE EXTRA LONG-PERIOD SWELL WILL ALSO PRODUCE INFREQUENT LARGE
WAVES TO OTHER SHORES SUCH AS THE KONA COAST OF THE BIG ISLAND WHERE
SUDDEN CHANGES IN WAVE RUN-UP AND OVER-WASH ARE POSSIBLE.
BEACH-GOERS SHOULD BE VIGILANT AND USE CAUTION IF VENTURING NEAR THE
WATERS EDGE.

A MARINE WEATHER STATEMENT WILL BE ISSUED SHORTLY FOR CAUTION
ADVISED FOR THE WEST FACING HARBOR ENTRANCES SUCH AS THE WAIANAE
BOAT HARBOR AND KAILUA KONA ON THE BIG ISLAND.

THIS ABOVE NORMAL SWELL HAVE WARRANTED A SMALL CRAFT ADVISORY FOR
MOST WATERS AS WELL.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
HIGH SURF WARNING UNTIL 6 AM HST SUNDAY FOR NORTH AND WEST FACING
SHORES OF NIIHAU KAUAI OAHU MOLOKAI LANAI KAHOOLAWE MAUI AND WEST
FACING SHORES OF THE BIG ISLAND.

SMALL CRAFT ADVISORY UNTIL 6 AM HST SATURDAY FOR ALL HAWAIIAN
WATERS EXCEPT MAALAEA BAY.

WIND ADVISORY UNTIL 6 PM HST FRIDAY FOR BIG ISLAND SUMMITS.

&&

PUBLIC AND MARINE...LAU
AVIATION...HOUSTON