Flash Flood Warning 32, NWS Honolulu, HI

145 
WGHW70 PHFO 031815
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
815 AM HST FRI JUN 3 2011

HIC003-032030-
/O.CON.PHFO.FF.W.0032.000000T0000Z-110603T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HONOLULU COUNTY-
815 AM HST FRI JUN 3 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR THE ISLAND OF OAHU IN
HONOLULU COUNTY UNTIL 1030 AM HST...

EMERGENCY MANAGERS REPORTED THAT KAMEHAMEHA HIGHWAY HAS BEEN CLOSED 
AT WAIKANE VALLEY ROAD.  HEAVY RAIN IS ALSO OCCURRING OVER WINDWARD 
SLOPES FROM KAHANA TO KAHUKU AND OVER LEEWARD KOOLAU SLOPES NEAR 
FROM AIEA TO PEARL CITY.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WAHIAWA...
PUNALUU...WAIALUA...LAIE...KAAAWA...HALEIWA...MILILANI...
WAIPAHU...KUNIA...WAIPIO...WAIANAE AND AIEA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS FLASH FLOODING IS IMMINENT OR OCCURRING
IN STREAMS...ROADS AND LOW LYING AREAS. MOVE TO HIGHER GROUND NOW.

DO NOT CROSS FAST FLOWING OR RISING WATER IN YOUR VEHICLE OR ON FOOT.
TURN AROUND...DON/T DROWN.

&&

THIS WARNING MAY NEED TO BE EXTENDED BEYOND 1030 AM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2159 15831 2160 15815 2173 15796 2136 15767
      2137 15817

$$

KODAMA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
400 AM HST FRI JUN 3 2011

.SYNOPSIS...
AN UPPER LEVEL LOW AND A SURFACE HIGH PRESSURE REMAIN THE DRIVING
FORCES FOR OUR WEATHER FOR ANOTHER DAY OR TWO. THE UPPER LOW WILL
CONTINUE TO BRING UNSTABLE AIR TO THE REGION WHICH WILL ALLOW FOR
THE CHANCE OF THUNDERSTORMS. THE HIGH PRESSURE WILL CONTINUE TO
BRING TRADES TO THE AREA WHICH WILL HELP TO KEEP SHOWERS MOVING OVER
THE AREA. THE SECOND HALF OF THE WEEKEND WILL SEE THE WINDS TAPER
OFF AND LOCAL LAND AND SEA BREEZES TO SET UP.
&&

.DISCUSSION...
THE UPPER LEVEL LOW THAT HAS SPARKED SOME THUNDERSTORMS NEAR THE
MAIN HAWAIIAN ISLANDS OVER THE LAST COUPLE OF DAYS REMAINS NEAR
KAUAI. AT 3 AM...THE UPPER LOW IS ABOUT 60 MILES NORTH OF BARKING
SANDS ON KAUAI. AS THE MODELS HAD PREDICTED...THE LOW MOVED WEST
OVER THE LAST 24 HOURS...SLOWING IN THE LAST SEVERAL HOURS. THIS
BODES WELL FOR THE MODEL SOLUTION OF THE LOW MAKING A TREK BACK TO
THE EAST/NORTHEAST AS IT GETS DRAWN INTO A FRONTAL SYSTEM FAR TO THE
NORTH AND NORTHWEST OF THE ISLANDS.

MEANWHILE WE HAVE A SURFACE HIGH PRESSURE SYSTEM TO THE NORTHEAST OF
THE ISLANDS WHICH HAS BEEN BRINGING SOME BRISK TRADES TO THE
ISLANDS. THE WINDS ARE EXPECTED TO BE DOWN JUST A BIT TODAY...AND
REDUCE FURTHER TOMORROW AS THE HIGH STARTS TO MOVE TO THE EAST. AS
WE HEAD INTO SUNDAY...THE HIGH IS EXPECTED BE FAR ENOUGH TO THE EAST
TO LEAD TO SOME LOCAL LAND AND SEA BREEZES.

OVERNIGHT THERE HAVE BEEN A FEW THUNDERSTORMS ACROSS THE
REGION...AND SOME ISOLATED HEAVY SHOWERS. IT REMAINS VERY DIFFICULT
TO PIN POINT WHERE THE THUNDERSTORMS WILL POP...ALTHOUGH THE
PROXIMITY OF THE UPPER LOW TO KAUAI WOULD SUGGEST MORE SHOWERS AT
THAT END OF THE STATE. THAT BEING SAID...THUNDERSTORMS HAVE BEEN
FORMING OVER THE BIG ISLAND UPSLOPE AREAS THE LAST COUPLE OF
DAYS...AND THAT IS LIKELY TO REPEAT AGAIN TODAY. THIS AFTERNOON
CONVECTION COULD BRING SOME WINTER WEATHER TO THE BIG ISLAND
SUMMITS...BUT ANY SUCH THUNDERSTORMS ARE EXPECTED TO BE
BRIEF...WHICH WILL LIMIT SNOW AMOUNTS.

AS WE HEAD INTO NEXT WEEK...THE QUESTION WILL BECOME HOW LIGHT WILL
THE WINDS BECOME...AND HOW SOUTHEASTERLY WILL THEY BE. THERE IS
GENERAL CONSENSUS THAT THE OVERALL BACKGROUND WIND FLOW WILL BE
SOUTHEASTERLY...BUT THE WIND SPEEDS ARE THE BIGGER QUESTION.

MADE SOME MINOR TWEAKS TO THE GRIDS...BUT OVERALL PHILOSOPHY HAS NOT
CHANGED.

&&

.MARINE...
THE SMALL CRAFT ADVISORY REMAINS UP FOR THE TYPICALLY WINDIER AREAS
NEAR MAUI AND HAWAII COUNTIES THROUGH THIS AFTERNOON. TRADES
ARE EXPECTED TO DROP SOME TODAY...AND SHOULD BE BELOW ADVISORY
LEVELS LATER TODAY OR TONIGHT. AS A RESULT WILL NOT BE EXTENDING
THE ADVISORY AT THIS TIME.

LONG PERIOD SOUTH SWELLS ARRIVING FRIDAY NIGHT AND SATURDAY ARE
EXPECTED TO BUILD THROUGH SUNDAY...BRINGING SURF HEIGHTS TO NEAR
ADVISORY LEVELS OF 8 FEET FOR SOUTH FACING SHORES. THIS SURF WILL
CONTINUE INTO MONDAY BEFORE DIMINISHING. A LATE SEASON NORTHWEST
SWELL WILL ARRIVE SATURDAY AND IS EXPECTED TO PRODUCE A NOTICEABLE
BUMP IN SURF HEIGHTS ALONG NORTH AND WEST FACING SHORES FROM LATE
SATURDAY THROUGH MONDAY.

&&

.AVIATION...
THUNDERSTORMS IN THE AREA WILL CONTINUE TO BE AN ISSUE FOR ANOTHER
DAY OR SO. THESE THUNDERSTORMS AND OTHER SHOWERS IN THE AREA WILL AT
TIMES REDUCE VISIBILITY AND CEILINGS.

AIRMET TANGO REMAINS FOR LOW LEVEL TURBULENCE IN THE LEE OF THE
MOUNTAINS. THE COMPUTER MODELS ARE IN GOOD AGREEMENT SHOWING WINDS
DIMINISHING OVER THE WEEKEND WITH LESS LOW LEVEL TURBULENCE THROUGH
THE MIDDLE OF NEXT WEEK.

&&

.FIRE WEATHER...
THERE WILL REMAIN A HIGHER THAN NORMAL POTENTIAL FOR LIGHTNING
IGNITED WILDFIRES THE NEXT FEW AFTERNOONS. BESIDES LIGHTNING...
OTHER ENVIRONMENTAL FACTORS ARE NOT CONDUCIVE TO RAPID FIRE GROWTH.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST TODAY FOR KAIWI CHANNEL-MAALAEA
BAY-PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.
&&