Wind Advisory 31, NWS Honolulu, HI

022 
WWHW70 PHFO 120138
NPWHFO

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE HONOLULU HI
338 PM HST THU APR 11 2013

...WIND ADVISORY FOR KAHOOLAWE THROUGH FRIDAY EARLY MORNING...

.STRONG WINDS OVER THE ALENUIHAHA CHANNEL WILL SPREAD INTO
KAHOOLAWE THROUGH FRIDAY EARLY IN THE MORNING WITH SPEEDS
REACHING ADVISORY LEVELS.

HIZ016-121445-
/O.CON.PHFO.WI.Y.0031.000000T0000Z-130412T1600Z/
KAHOOLAWE-
338 PM HST THU APR 11 2013

...WIND ADVISORY REMAINS IN EFFECT UNTIL 6 AM HST FRIDAY...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 6 AM HST FRIDAY. 

* WINDS...EAST 20 TO 30 MPH WITH LOCALIZED GUSTS TO 50 MPH.

* TIMING...UNTIL 6 AM HST FRIDAY.

* IMPACTS...WINDS THIS STRONG CAN BRING DOWN TREE BRANCHES AND 
  MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF AT LEAST 30 MPH...
OR GUSTS OF AT LEAST 50 MPH...ARE EXPECTED. MOTORISTS SHOULD USE
EXTRA CAUTION.

&&

$$

REYNES

520 
WWHW70 PHFO 120533
NPWHFO

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE HONOLULU HI
733 PM HST THU APR 11 2013

HIZ016-120645-
/O.CAN.PHFO.WI.Y.0031.000000T0000Z-130412T1600Z/
KAHOOLAWE-
733 PM HST THU APR 11 2013

...WIND ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS CANCELLED THE WIND
ADVISORY. 

WINDS ACROSS KAHOOLAWE HAVE EASED TO BELOW ADVISORY LEVEL.

$$

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HONOLULU HI
10 AM HST THU APR 11 2013

.UPDATE...
GUSTY WINDS ACROSS THE TYPICALLY WINDIER WATERS AROUND MAUI AND THE
BIG ISLAND WILL REMAIN AT SMALL CRAFT ADVISORY LEVELS THROUGH FRIDAY
AFTERNOON. THEREFORE...THE ADVISORY HAS BEEN EXTENDED UNTIL 6 PM
HST FRIDAY.

&&

.SYNOPSIS...
A MODERATE EAST-SOUTHEAST FLOW WILL COMBINE WITH PERIODS OF SEA
BREEZES THIS AFTERNOON TO BRING SOME LOW CLOUDS AND A FEW SHOWERS.
BEST CHANCES OF RAIN REMAIN OVER INTERIOR AND MOUNTAIN AREAS THIS
AFTERNOON AND EARLY EVENING. A COLD FRONT WILL APPROACH THE ISLANDS
ON FRIDAY AND BRING WET WEATHER TO THE WESTERN HALF OF THE ISLAND
CHAIN OVER THE WEEKEND. THUNDERSTORMS ARE POSSIBLE FOR KAUAI AND
OAHU FROM LATE FRIDAY THROUGH EARLY SUNDAY. LOCALIZED HEAVY RAINFALL
IS POSSIBLE AS FAR EAST AS OAHU. TRADE WINDS WILL INCREASE OVER THE
EASTERN PART OF THE STATE ON MONDAY AND HELP IN PUSHING THE
UNSETTLED WEATHER AWAY FROM THE AREA.

&&

.DISCUSSION...
A DOMINANT HIGH PRESSURE SYSTEM REMAINS LOCATED FAR NE OF THE MAIN
HAWAIIAN ISLANDS WITH AN ASSOCIATED SFC RIDGE EXTENDING THROUGH JUST
N OF THE ISLAND CHAIN. TO THE W/NW OF THE AREA...A MID/UPPER LVL
TROUGH AND AN ASSOCIATED SFC FRONT ARE GRADUALLY PUSHING E TOWARD
THE ISLANDS. THIS SYNOPTIC SETUP WILL KEEP PRESSURE GRADIENTS OVER
THE AREA STEEP ENOUGH TO SUPPORT MODERATE TO LOCALLY FRESH E/SE
WINDS MAINLY ACROSS WINDWARD AREAS. SOME LEEWARD AREAS...ESPECIALLY
AROUND THE BIG ISLAND AND MAUI...WILL EXPERIENCE LIGHTER WINDS TODAY
AND ALLOW FOR STRONGER SEA BREEZE CIRCULATIONS TO DEVELOP IN THE
AFTERNOON HOURS.

THE 12Z HILO AND LIHUE SOUNDING DATA INDICATE A GRADUAL INCREASE IN
ATMOSPHERIC MOISTURE OVER THE AREA WITH PWATS AROUND 1.3 INCHES.
AND AS ONSHORE FLOW DEVELOPS WITH SEA BREEZES...EXPECT LOW CLOUDS
AND SHOWERS BUILDING AROUND LEEWARD AND INTERIOR AREAS. HOWEVER...AS
THE PREVIOUS DISCUSSION POINTED OUT...IT IS POSSIBLE TO EXPERIENCE A
SORT OF HYBRID SEA BREEZE/TRADE WIND PATTERN TODAY...SO BASICALLY
ALL AREAS ACROSS THE ISLAND CHAIN COULD HAVE SOME KIND OF RAIN
ACTIVITY. ACCUMULATIONS SHOULD REMAIN LOW SINCE THE AIR MASS REMAINS
NEARLY NEUTRALLY STABLE AND BOTH SOUNDINGS DEPICT SOLID INVERSIONS
AROUND 6.5 KFT.

LATEST MODEL RUNS ARE SHOWING FAIRLY GOOD AGREEMENT REGARDING THE
UPCOMING RAIN EVENT FOR THIS WEEKEND. WV/IR SATELLITE LOOP IMAGERY
SHOWS THE UPPER LOW/TROUGH COMPLEX SYSTEM FAR NW OF THE ISLANDS WITH
AN ASSOCIATED COLD FRONT BOUNDARY LOCATED AROUND 680 MILES NW OF
KAUAI...GRADUALLY MOVING TOWARD THE AREA. GLOBAL MODELS...MAINLY
ECMWF AND GFS...BRING THE LEADING EDGE OF THE FRONT TO JUST W OF THE
ISLANDS BY FRI. THIS WILL FURTHER VEER WINDS TO THE SE WHILE
BRINGING INCREASING SHOWERS OVER KAUAI AND OAHU. BY FRI
NIGHT...WIDESPREAD SHOWERS WITH LOCALLY HEAVY RAIN POSSIBLE ARE
EXPECTED FOR KAUAI. PLENTY OF PRE-FRONTAL CONVECTION WILL BE
AFFECTING MOST OF THE W HALF OF THE ISLAND CHAIN SAT THROUGH EARLY
SUN. WITH CONFIDENCE RISING IN TERMS OF POTENTIAL FOR HEAVY
RAIN...THE FLASH FLOOD WATCH WILL BE EXPANDED TO INCLUDE OAHU AND IT
WILL ALSO BE EXTENDED THROUGH SUN EARLY MORNING. THE SLIGHT CHANCE
OF THUNDERSTORMS WILL ALSO BE EXPANDED TO INCLUDE OAHU THROUGH SUN.

THE UPPER LVL TROUGH AND THE SFC FRONT SYSTEM ASSOCIATED WITH THE
FRONT WILL BEGIN LIFTING TO THE NE SATURDAY NIGHT...BUT THE
LINGERING MOISTURE OVER KAUAI AND OAHU WILL KEEP WETTER THAN NORMAL
CONDITIONS FOR THOSE ISLANDS THROUGH LATE SUN. MAUI COUNTY AND THE
BIG ISLAND SEEM TO REMAIN LESS ACTIVE...WITH MAINLY SCATTERED
SHOWERS EXPECTED THROUGHOUT THE WEEKEND. INCREASING TRADE WINDS WILL
RETURN EARLY NEXT WEEK...WHICH SHOULD PUSH THE WET WEATHER WEST OF
THE ISLANDS.

&&

.AVIATION...
AT THE TERMINALS...MVFR CONDITIONS WILL PREVAIL...EXCEPT VFR CIG
EXPECTED AT PHNY DUE TO SEA BREEZE CONVERGENCE FROM 20Z-02Z.

PREVAILING SE FLOW WILL FOCUS CLOUDS AND SHRA ALONG E AND SE FACING
COASTS AND SLOPES...ESPECIALLY DURING NIGHTS AND MORNINGS...WITH
ISOL MVR CIG/VIS IN SHRA. THE WINDS ARE LIGHT ENOUGH IN SHELTERED
LEEWARD AREAS TO ALLOW SEA BREEZES TO DRIVE CLOUD AND SHRA
DEVELOPMENT DURING THE AFTERNOON HOURS...LEADING TO ISOL MVFR
CIG/VIS.

ALTHOUGH WINDS REMAIN MARGINALLY STRONG...AIRMET TANGO REMAINS IN
EFFECT FOR MODERATE TURBULENCE BELOW 9000 FEET TO THE W THRU N OF
THE TERRAIN.

&&

.MARINE...
SURF REMAINS BELOW HIGHLIGHT CRITERIA THROUGH THE REST OF THE
WEEK. A MODEST SWELL FROM THE WEST-NORTHWEST IS EXPECTED THIS
WEEKEND.

A SMALL CRAFT ADVISORY REMAINS IN EFFECT FOR COASTAL WATERS ADJACENT
TO HAWAII AND MAUI COUNTIES DUE TO GUSTY EAST-SOUTHEAST WINDS
DIVERTING AROUND THE BIG ISLAND. WINDS ARE EXPECTED TO DECREASE
FRIDAY AFTERNOON AS WINDS TURN OUT OF THE SOUTH.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST FRIDAY FOR MAUI COUNTY WINDWARD
WATERS-ALENUIHAHA CHANNEL-BIG ISLAND WINDWARD WATERS- BIG ISLAND
LEEWARD WATERS-BIG ISLAND SOUTHEAST WATERS.

FLASH FLOOD WATCH FOR KAUAI NIIHAU AND OAHU FROM NOON HST FRIDAY
THROUGH 6 AM HST SUNDAY.

&&

DISCUSSION/MARINE...REYNES
AVIATION...BIRCHARD