Wind Advisory 15, NWS Honolulu, HI

784 
WWHW70 PHFO 221328
NPWHFO

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE HONOLULU HI
328 AM HST SUN MAY 22 2011

...VERY WINDY CONDITIONS EXPECTED AT HALEAKALA SUMMIT THROUGH
LATE THIS AFTERNOON...

.DEEP LAYERED HIGH PRESSURE NORTH OF HAWAII AND A STRONG GRADIENT
ACROSS THE STATE WILL RESULT IN VERY WINDY CONDITIONS AT HALEAKALA
SUMMIT.

HIZ022-230230-
/O.CON.PHFO.WI.Y.0015.000000T0000Z-110523T0400Z/
HALEAKALA SUMMIT-
328 AM HST SUN MAY 22 2011

...WIND ADVISORY REMAINS IN EFFECT UNTIL 6 PM HST THIS EVENING...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 6 PM HST THIS EVENING. 

WINDS ATOP THE SUMMITS OF HALEAKALA WILL BE FROM THE EAST-
NORTHEAST AT SPEEDS OF 30 TO 40 MPH...WITH GUSTS AS HIGH AS
50 MPH THROUGH LATE THIS AFTERNOON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT WINDS OF 30 MPH ARE EXPECTED. WINDS
THIS STRONG CAN MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH
PROFILE VEHICLES. USE EXTRA CAUTION.

&&

$$

FOSTER

337 
WWHW70 PHFO 230130
NPWHFO

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE HONOLULU HI
330 PM HST SUN MAY 22 2011


HIZ022-230230-
/O.CAN.PHFO.WI.Y.0015.000000T0000Z-110523T0400Z/
HALEAKALA SUMMIT-
330 PM HST SUN MAY 22 2011

...WIND ADVISORY IS CANCELLED...

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

WINDS HAVE DECREASED BELOW ADVISORY LEVELS AT THE HALEAKALA
SUMMIT. 

$$


MORRISON

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
830 PM HST SAT MAY 21 2011

.SYNOPSIS...
BREEZY TRADE WIND WEATHER WILL CONTINUE THROUGH NEXT WEEK. THE TRADE
WINDS WILL BRING BRIEF PASSING SHOWERS...MAINLY TO WINDWARD AND
MAUKA AREAS DURING NIGHTS AND MORNINGS...BUT THE STRONG TRADES WILL
CARRY A FEW SHOWERS OVER LEEWARD AREAS.

&&

.DISCUSSION...
A 1031 MB SURFACE HIGH ABOUT 1175 MILES NORTHEAST OF HAWAII IS
PROVIDING FRESH TO STRONG TRADE WINDS ACROSS ACROSS THE ISLANDS THIS
EVENING. THIS ELEVATED TRADE WIND FLOW PATTERN IS EXPECTED TO STAY
WITH US THROUGH THE NEXT WEEK. ALTHOUGH SKIES DID CLEAR SOMEWHAT
EARLIER THIS AFTERNOON AND NOT A WHOLE LOT OF SHOWER ACTIVITY IS
SEEN ON RADAR AT THE MOMENT...THIS IS EXPECTED TO INCREASE OVER THE
NEXT FEW HOURS. INFRARED SATELLITE SHOWS A BAND OF SHOWERY CUMULUS
CLOUDS MOVING IN WITH THE TRADES AND WILL LIKELY IMPACT ALL WINDWARD
SIDES OF ISLANDS. THE STRONG TRADES WILL CARRY A FEW SHOWERS OVER
LEEWARD AREAS...THOUGH COVERAGE WILL BE LESS RELATIVELY SPEAKING.
OVERALL RAINFALL AMOUNTS SHOULD BE LIGHT AS A STABLE RIDGE ALOFT IS
PARKED JUST NORTH OF THE STATE KEEPING TRADE WIND INVERSIONS STRONG
AND LOW.

THE SURFACE HIGH TO THE NORTHEAST WILL CHANGE LITTLE THROUGH
SUNDAY...BEFORE WEAKENING AND DISSIPATING ON MONDAY. A NEW HIGH WILL
BUILD NORTH OF THE ISLANDS AT THE SAME TIME...AND IT/S ASSOCIATED
RIDGE WILL REMAIN EAST TO WEST ORIENTED ALONG 33N FOR THE REMAINDER
OF THE WEEK. THE WINDS ARE EXPECTED TO EASE SLIGHTLY AS THE FIRST
HIGH WEAKENS...BUT THE GRADIENT OVER THE ISLANDS WILL SLACKEN ONLY
SLIGHTLY BEFORE TIGHTENING AGAIN IN RESPONSE TO THE NEW HIGH.
THEREFORE...BREEZY TRADE WINDS WILL PREVAIL WITH JUST A BRIEF AND
SLIGHT DIP IN WIND SPEEDS ON MONDAY INTO TUESDAY MORNING.

WATER VAPOR IMAGERY SHOWS A COMPACT ANTICYCLONE ALOFT NNE OF THE
ISLANDS...AND ALTHOUGH THE CENTER OF THIS HIGH WILL SHIFT W EARLY
NEXT WEEK...IT/S CONTINUED PRESENCE WILL MAINTAIN A STRONG
SUBSIDENCE INVERSION OVER THE ISLANDS. WITH LITTLE IN THE WAY OF
ORGANIZED MOISTURE SOURCES...ONLY BRIEF PASSING SHOWERS ARE
EXPECTED...MAINLY WINDWARD AND MAUKA DURING NIGHTS AND MORNINGS.
SO...WHILE THERE CONTINUES TO BE A GOOD CHANCE OF WINDWARD
SHOWERS...LITTLE SIGNIFICANT ACCUMULATION IS EXPECTED. THE RIDGE
ALOFT WILL ALSO SUPPORT A DEEP LAYER OF TRADE WINDS...WHICH WILL
INCREASE THEIR GUSTINESS...AND BRING WINDS NEAR ADVISORY SPEEDS TO
THE UPPER ELEVATIONS OF MAUI AND THE BIG ISLAND...BUT SO FAR WINDS
HAVE REMAINED IN THE 20 TO 30 MPH RANGE.

&&

.AVIATION...
00Z SOUNDINGS FROM LIHUE AND HILO AND ACARS SOUNDINGS OUT OF
LIHUE/HONOLULU/KAHULUI SHOW INVERSIONS NEAR 6-8KFT...AND RADAR VAD
WIND PROFILES AND ACARS SOUNDINGS SHOW 25-30 KNOTS OF WIND BELOW THE
INVERSION. THIS SETUP IS CONDUCIVE TO LOW-LEVEL TURBULENCE IN THE
LEE OF THE MOUNTAINS. AIRMET TANGO REMAINS IN EFFECT FOR MODERATE
TURB. THIS SETUP IS EXPECTED TO CONTINUE INTO NEXT WEEK.

&&

.MARINE...
A SMALL CRAFT ADVISORY /SCA/ IS IN EFFECT FOR THE WINDIER MARINE
ZONES THROUGH SUNDAY...AND WILL LIKELY NEED TO BE EXTENDED IN
TIME. A BUILDING NORTHWEST SWELL DURING THE DAY SUNDAY WILL PUSH
SEAS NEAR 10 FEET FOR MANY WINDWARD WATERS ON SUNDAY...BUT NOT
CONFIDENT ENOUGH THAT WILL ACTUALLY BREACH SCA CRITERIA AND FOR
ALL OR SOME OF THE WINDWARD MARINE ZONES. WILL MONITOR WINDWARD
BUOYS OVERNIGHT TO SEE WHAT THE TREND IS AND MAKE A DECISION AT
THE EARLY MORNING ISSUANCE.

FRESH TO STRONG TRADE WINDS WILL BRING SHORT-PERIOD CHOPPY SURF TO
EAST FACING SHORES FOR AT LEAST THE NEXT SEVERAL DAYS. MOKAPU BUOY
IS SHOWING COMBINED SEAS ABOVE 8 FEET...MOST OF THAT WIND
DRIVEN...ALREADY THIS EVENING AND IS EXPECTED TO TREND HIGHER
THROUGH LATE SUNDAY. ISSUED A HIGH SURF ADVISORY NOW THROUGH MONDAY
MORNING FOR EAST FACING SHORES OF KAUAI...OAHU...MOLOKAI...MAUI AND
THE BIG ISLAND. WINDS SHOULD THEN BACK DOWN JUST ENOUGH MONDAY AND
MONDAY NIGHT. AN EXTENDED PERIOD OF ELEVATED SOUTHERLY SWELLS IS
EXPECTED FROM TUESDAY THROUGH FRIDAY... WITH PEAK SURF HEIGHTS AGAIN
AROUND ADVISORY LEVELS.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
HIGH SURF ADVISORY UNTIL 6 AM HST MONDAY FOR KAUAI WINDWARD-OAHU
KOOLAU-OLOMANA-MOLOKAI WINDWARD-MAUI WINDWARD WEST-WINDWARD
HALEAKALA-SOUTH BIG ISLAND-BIG ISLAND NORTH AND EAST.

SMALL CRAFT ADVISORY UNTIL 6 PM HST SUNDAY FOR KAIWI CHANNEL-
MAALAEA BAY-PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND
LEEWARD WATERS-BIG ISLAND SOUTHEAST WATERS.

&&

DISCUSSION/MARINE...FOSTER
AVIATION...KINEL