High Surf Warning 15, NWS Honolulu, HI

549 
WHHW40 PHFO 010110
CFWHFO

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE HONOLULU HI
310 PM HST THU MAR 31 2016

...HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF KAUAI
NIIHAU OAHU AND MOLOKAI...FOR NORTH FACING SHORES OF MAUI...AND
FOR WEST FACING SHORES OF THE BIG ISLAND...

.A LARGE WEST NORTHWEST SWELL WILL GRADUALLY DIMINISH...BUT SURF
HEIGHTS WILL REMAIN LARGE ENOUGH TO WARRANT A HIGH SURF ADVISORY
FOR MOST NORTH AND WEST FACING SHORES THROUGH TONIGHT.

HIZ023-011415-
/O.CAN.PHFO.SU.W.0015.000000T0000Z-160401T0400Z/
/O.EXA.PHFO.SU.Y.0028.000000T0000Z-160401T1600Z/
KONA-
310 PM HST THU MAR 31 2016

...HIGH SURF ADVISORY IN EFFECT UNTIL 6 AM HST FRIDAY...
...HIGH SURF WARNING IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A HIGH SURF
ADVISORY...WHICH IS IN EFFECT UNTIL 6 AM HST FRIDAY. THE HIGH
SURF WARNING HAS BEEN CANCELLED. 

* SURF...6 TO 10 FEET ALONG WEST FACING SHORES OF THE BIG ISLAND.

* TIMING...THROUGH TONIGHT.

* IMPACTS...MODERATE...EXPECT STRONG BREAKING WAVES...SHORE 
  BREAK...AND STRONG LONGSHORE AND RIP CURRENTS MAKING SWIMMING 
  DIFFICULT AND DANGEROUS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BEACHGOERS...SWIMMERS...AND SURFERS SHOULD HEED ALL ADVICE GIVEN
BY OCEAN SAFETY OFFICIALS AND EXERCISE CAUTION. KNOW YOUR LIMITS
AND SEEK OCEAN RECREATION AREAS BEST SUITED FOR YOUR ABILITIES.
WHEN IN DOUBT...DO NOT GO OUT.

&&

$$

HIZ001>003-006>008-012-013-017-019-020-011415-
/O.CON.PHFO.SU.Y.0028.000000T0000Z-160401T1600Z/
NIIHAU-KAUAI WINDWARD-KAUAI LEEWARD-WAIANAE COAST-
OAHU NORTH SHORE-OAHU KOOLAU-MOLOKAI WINDWARD-MOLOKAI LEEWARD-
MAUI WINDWARD WEST-MAUI CENTRAL VALLEY-WINDWARD HALEAKALA-
310 PM HST THU MAR 31 2016

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 AM HST FRIDAY...

* SURF...ALONG NORTH AND WEST FACING SHORES OF KAUAI AND NIIHAU
  AND NORTH FACING SHORES OF OAHU...12 TO 16 FEET. ALONG WEST
  FACING SHORES OF OAHU AND MOLOKAI...8 TO 12 FEET.

* TIMING...THROUGH TONIGHT.

* IMPACTS...MODERATE...EXPECT STRONG BREAKING WAVES...SHORE 
  BREAK...AND STRONG LONGSHORE AND RIP CURRENTS MAKING SWIMMING 
  DIFFICULT AND DANGEROUS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BEACHGOERS...SWIMMERS...AND SURFERS SHOULD HEED ALL ADVICE GIVEN
BY OCEAN SAFETY OFFICIALS AND EXERCISE CAUTION. KNOW YOUR LIMITS
AND SEEK OCEAN RECREATION AREAS BEST SUITED FOR YOUR ABILITIES.
WHEN IN DOUBT...DO NOT GO OUT.

&&

$$

FOSTER

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
356 AM HST THU MAR 31 2016

.SYNOPSIS...
LIGHT WINDS AND MOSTLY DRY WEATHER WILL CONTINUE THROUGH
TONIGHT...WITH TRADE WINDS GRADUALLY STRENGTHENING FRIDAY INTO THE
WEEKEND. THE MODERATE TRADE WINDS WILL DELIVER A FEW WINDWARD
SHOWERS THAT WILL FAVOR NIGHTS AND MORNINGS...BUT A MOSTLY DRY
PATTERN WILL PERSIST. TRADE WINDS WILL ARE EXPECTED TO WEAKEN MONDAY
AS A FRONT APPROACHES...BUT STRONGER TRADE WINDS TUESDAY AND
WEDNESDAY OF NEXT WEEK MAY DELIVER INCREASED WINDWARD SHOWERS.
PERIODS OF VOG ARE POSSIBLE... MAINLY TODAY AND AGAIN ON MONDAY.

&&

.DISCUSSION...
A WEAK SURFACE HIGH THAT WAS CENTERED SEVERAL HUNDRED MILES W OF THE
ISLANDS YESTERDAY IS MOVING QUICKLY ENE...AND IS CURRENTLY VERY
CLOSE TO THE ISLANDS...BEFORE MOVING NE OF THE ISLANDS LATER TODAY.
THE ASSOCIATED SURFACE RIDGE WILL REMAIN CLOSE TO THE ISLANDS...AND
LARGE SCALE WINDS WILL REMAIN SUFFICIENTLY LIGHT TO ALLOW LAND AND
SEA BREEZES TO DRIVE THE WIND AND WEATHER PATTERN OVER THE ISLANDS
THROUGH TONIGHT. HOWEVER...WINDS AT CLOUD LEVELS ARE IN THE PROCESS
OF BECOMING NE...BEFORE TURNING TO THE E AND SE LATER TODAY. THE
LIGHT NE FLOW HAS ALLOWED SOME CLOUDS AND LIGHT SHOWERS TO POOL
ALONG WINDWARD COASTS AND NEAR SHORE WATERS OVERNIGHT...AND SOME MAY
SNEAK ASHORE THIS MORNING TO BRING AN ISOLATED LIGHT SHOWER. BY
AFTERNOON...SEA BREEZE CONVERGENCE WILL BRING INCREASING CLOUDS TO
LEEWARD AND INTERIOR AREAS...AND A SLIGHT CHANCE OF SHOWERS. THE
VEERING LOW-LEVEL FLOW WILL BRING VOG OVER MOST AREAS OF THE STATE
THROUGH TONIGHT BEFORE CLEARING ON FRIDAY.

THE SURFACE RIDGE WILL DRIFT N ON FRIDAY...ALLOWING TRADE WINDS TO
SLOWLY STRENGTHEN. WEATHER WILL REMAIN MOSTLY DRY OUTSIDE OF A FEW
BRIEF WINDWARD SHOWERS...DUE TO A MID LEVEL RIDGE BUILDING OVER THE
AREA. A NEW SURFACE HIGH PASSING N OF THE AREA FRIDAY NIGHT AND
SATURDAY WILL LEAD TO A STRENGTHENING TRADE WIND FLOW...WITH
MODERATE TRADE WINDS EXPECTED THROUGH THE WEEKEND. THE FLOW WEAKENS
AND VEERS AGAIN EARLY NEXT WEEK IN ADVANCE OF ANOTHER FRONT...WITH
VOGGY CONDITIONS POSSIBLE AGAIN STATEWIDE ON MONDAY. MOISTURE
ASSOCIATED WITH THIS FRONT MAY BECOME EMBEDDED IN A STRONG NE TRADE
WIND FLOW AROUND TUESDAY AND WEDNESDAY OF NEXT WEEK AS A NEW HIGH
PASSES N OF THE ISLANDS.

ALOFT...THE ISLANDS LIE ON THE SOUTHERN PERIPHERY OF A STRONG JET
STREAM. WINDS OVER THE SUMMITS OF MAUNA KEA AND MAUNA LOA REMAIN
ELEVATED THIS MORNING...BUT HAVE DROPPED BELOW ADVISORY LEVELS. AS
THE JET LIFTS N OVER THE NEXT 12 TO 24 HOURS...SUMMIT WINDS ARE
EXPECTED TO DIMINISH FURTHER.

&&

.AVIATION...
UP TO 3 AM HST...THERE HAS NOT BEEN MUCH REDUCTION IN THE LOW CLOUD
COVERAGE ACROSS THE MAIN HAWAIIAN ISLANDS THIS MORNING. THEY ARE
MAINLY SITUATED OVER THE ADJACENT WINDWARD WATERS. THEY ARE MAINLY
STABLE...HIGH BASED...STRATOCUMULUS CLOUDS WITH TOPS BETWEEN 6 AND 8
KFT. THERE IS A PATCH OF LIGHT SHOWERS OFF HANA AIRPORT BUT THAT IS
ABOUT IT ON RADAR.

SOME OF THE CLOUDS WILL BURN OFF AFTER SUNRISE BUT THIS PARTIAL
CLEARING COULD BE TEMPORARILY. AS A SEA BREEZE FLOW DEVELOPS LATER
THIS MORNING...COUPLED WITH DAYTIME HEATING...WILL RESULT IN SOME
AFTERNOON CLOUDINESS FAVORING LEEWARD AND INTERIOR AREAS. AN
ISOLATED SHOWER OR TWO IS POSSIBLE WITH THESE CLOUDS.

THE PREVAILING FLYING CONDITION IS VFR BUT THERE WILL BE ISOLATED
MVFR CEILINGS. A COUPLE OF WINDWARD TERMINALS HAVE BEEN REPORTING
MVFR CIGS DURING THE EVENING.

THE LOW LEVEL WIND FLOW CONTINUES TO VEER NORTHEAST THIS MORNING AS
A SURFACE RIDGE RELOCATES JUST TO THE NORTH OF THE ISLANDS.

&&

.MARINE...
A LARGE NW SWELL PEAKED YESTERDAY AND IS SLOWLY TRENDING DOWN AT
UPSTREAM BUOY 51101...WITH OBSERVATIONS FROM PACIOOS NEAR SHORE
BUOYS SUPPORTING A DOWNGRADE OF THE HIGH SURF WARNING TO A HIGH SURF
ADVISORY...WHICH IS NOW IN EFFECT FOR EXPOSED N AND W FACING SHORES
THROUGH 6 AM FRIDAY. SURF IS EXPECTED TO DIMINISH BELOW ADVISORY
LEVELS STATEWIDE ON FRIDAY. MOSTLY SMALL SURF WILL PREVAIL THROUGH
THE WEEKEND...WITH A MODERATE NW SWELL ON TUESDAY LIKELY PEAKING
BELOW ADVISORY LEVELS. ELSEWHERE...A SMALL S SWELL WILL GRADUALLY
DIMINISH TODAY. THE OAHU SURF DISCUSSION WAS UPDATED YESTERDAY AND
CONTAINS MORE DETAILS ON THE SURF OUTLOOK.

DESPITE LIGHT WINDS...A SMALL CRAFT ADVISORY /SCA/ IS IN EFFECT FOR
MANY MARINE ZONES THROUGH THIS AFTERNOON AS COMBINED SEAS REMAIN AT
OR ABOVE 10 FEET. THEREAFTER...A SCA WILL NOT BE NEEDED UNTIL THIS
WEEKEND...WHEN STRENGTHENING TRADE WINDS ARE EXPECTED TO REACH
CRITERIA IN THE WINDIEST MARINE ZONES AROUND MAUI AND THE BIG
ISLAND. TRADE WINDS ARE THEN EXPECTED TO DIMINISH BELOW SCA SPEEDS
ON MONDAY.

&&

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

SMALL CRAFT ADVISORY UNTIL 4 PM HST THIS AFTERNOON FOR KAUAI
NORTHWEST WATERS-KAUAI WINDWARD WATERS-KAUAI LEEWARD WATERS-KAUAI
CHANNEL-OAHU WINDWARD WATERS-KAIWI CHANNEL-MAUI COUNTY WINDWARD
WATERS-ALENUIHAHA CHANNEL-BIG ISLAND WINDWARD WATERS.

&&

DISCUSSION/MARINE...BIRCHARD
AVIATION...LAU