Flash Flood Warning 34, NWS Honolulu, HI

794 
WGHW50 PHFO 281145
FFWHFO
HIC009-281445-
/O.EXT.PHFO.FF.W.0034.000000T0000Z-081228T1445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
145 AM HST SUN DEC 28 2008

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  THE ISLAND OF MAUI IN MAUI COUNTY

* UNTIL 445 AM HST

* AT 115 AM HST...THE STREAM GAGE AT OHEO GULCH CONTINUED TO  
  INDICATE ELEVATED WATER LEVELS. RUNOFF FROM THE HEAVY RAINFALL 
  DURING THE PAST FEW HOURS WILL CONTINUE TO PRODUCE FLOODING IN 
  SOME PARTS OF THE AREA.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  KEANAE AND HANA.

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 445 AM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2065 15623 2074 15612 2078 15623 2084 15630
      2095 15626 2079 15598 2069 15596 2059 15614

$$
HOUSTON

424 
WGHW70 PHFO 281435
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
435 AM HST SUN DEC 28 2008

HIC009-281445-
/O.CAN.PHFO.FF.W.0034.000000T0000Z-081228T1445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MAUI IN MAUI COUNTY-
435 AM HST SUN DEC 28 2008

...THE FLASH FLOOD WARNING IS CANCELLED FOR THE ISLAND OF MAUI IN
MAUI COUNTY...

THE HEAVY RAINS AND FLOODING HAVE SUBSIDED...BUT RUNOFF IS STILL
OCCURRING AND STREAMS WILL REMAIN HIGH FOR SEVERAL HOURS.

LAT...LON 2065 15623 2074 15612 2078 15623 2084 15630
      2095 15626 2079 15598 2069 15596 2059 15614

$$
HOUSTON

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
830 PM HST SAT DEC 27 2008

.SYNOPSIS...AN UPPER LEVEL TROUGH ABOVE THE HAWAIIAN ISLANDS WILL
MAINTAIN UNSTABLE ATMOSPHERIC CONDITIONS ACROSS MOST OF THE STATE
TONIGHT. THEREFORE...EXPECT NUMEROUS SHOWERS AND ISOLATED
THUNDERSTORMS TO CONTINUE OVER PARTS OF THE ISLAND CHAIN...
ESPECIALLY OVER THE EASTERN END OF THE STATE NEAR MAUI AND THE BIG
ISLAND. THE WET TRADE WIND PATTERN WILL PERSIST THROUGH SUNDAY.

&&

.DISCUSSION...
THE PRESSURE GRADIENT SOUTH OF A SURFACE RIDGE LOCATED ABOUT 750
MILES NORTH OF HONOLULU IS MAINTAINING MODERATE TO LOCALLY FRESH
TRADE WINDS ACROSS THE STATE TONIGHT. HOWEVER...THE AXIS OF AN UPPER
LEVEL TROUGH LOCATED DIRECTLY ABOVE STATE HAS CONTINUED TO
DESTABILIZED THE ATMOSPHERE. WATER VAPOR IMAGERY SHOWS AN APPARENT
SHORT WAVE LIFTING OUT TO THE NORTHEAST OVER MAUI AND THE BIG
ISLAND. A COLD POOL OF AIR ASSOCIATED WITH THE TROUGH ALOFT IS ONE
OF THE MAIN INGREDIENTS FOR THE ACTIVE WEATHER. THE UNSTABLE
CONDITIONS ARE DUE TO MIDDLE TROPOSPHERIC TEMPERATURES OF MINUS 12
TO MINUS 13 DEGREES CELSIUS.

DEEP CONVECTION CONTINUES NEAR EASTERN MAUI THIS EVENING WITH CLOUD
TOPS ESTIMATED TO BE NEAR 35 THOUSAND FEET. AS A RESULT OF THE
THUNDERSTORMS OVER MAUI...A FLASH FLOOD WARNING HAS BEEN ISSUED.
HEAVY RAINS THERE HAVE CAUSED THE OHEO GULCH STREAM GAGE TO REACH 8
FEET...WITH THE FLOOD ALARM THRESHOLD THERE BEING AROUND 7 FEET. A
SPECIAL MARINE WARNING WAS ALSO ISSUED FOR A STRONG THUNDERSTORM
JUST SOUTH OF MAUI IN THE ALENUIHAHA CHANNEL. THIS CONVECTION
APPEARS TO HAVE BEEN TRIGGERED BY THE UPPER LEVEL TROUGH...AND
ENHANCED BY THE SHORTWAVE...MOVING OVER MAUI. ADDITIONAL NEW
CONVECTION IS NOW SHOWING UP ALONG THE IMMEDIATE COAST OF THE
WINDWARD BIG ISLAND NOW...WITH CLOUD TOPS THERE TO AROUND 33
THOUSAND FEET. ANY HEAVY RAIN IN THIS AREA WILL BE A PROBLEM SINCE
THE GROUND IS SATURATED FROM THE HEAVY RAINS DURING THE PAST TWO
DAYS.

WITH THE MAIN AREA OF THUNDERSTORMS NOW OVER THE EASTERN END OF THE
ISLAND CHAIN EARLY THIS EVENING...IT APPEARS THAT THE POSSIBILITY OF
LOCALLY HEAVY SHOWERS AND THUNDERSTORMS WILL REMAIN OVER PARTS OF
MAUI COUNTY AND THE BIG ISLAND OVERNIGHT. HAVE UPDATED THE FORECAST
PACKAGE TO KEEP THUNDERSTORMS IN THE MAUI
COUNTY AND BIG ISLAND FORECAST TONIGHT.

THE WESTERN ISLANDS WILL LIKELY SEE WET TRADES CONTINUING TONIGHT.
THERE IS STILL A SLIGHT CHANCE OF A THUNDERSTORM OR TWO IN THE
VICINITY OF OAHU...MAINLY BEFORE MIDNIGHT TONIGHT. THE SHOWERS ARE
MOVING RAPIDLY...SO UNLESS ANCHORING OCCURS ALONG THE WINDWARD
SLOPES...SEE LITTLE FLOOD THREAT AT THIS TIME ON THAT ISLAND TONIGHT.

FORECAST MODELS INDICATE THE UPPER LEVEL TROUGH WILL LINGER OVER THE
ISLANDS THROUGH THROUGH SUNDAY BEFORE IT BEGINS TO LIFT OUT TO THE
EAST NORTHEAST BY THE START OF THE NEW WORK WEEK. EXPECT WET TRADE
WIND WEATHER TO CONTINUE THROUGH SUNDAY WITH THE GREATEST RAINFALL
TOTALS OCCURRING OVER WINDWARD FACING SLOPES.

ANOTHER UPPER LEVEL TROUGH IS EXPECTED TO PUSH IN TOWARD THE STATE
FROM THE NORTHWEST NEXT WEEK...REINFORCING THE TROUGHING PATTERN
WEST OF THE STATE. WEATHER ACROSS THE STATE WILL DEPEND ON HOW THIS
PATTERN SETS UP AND IT PROXIMITY TO THE ISLANDS. THIS SYSTEM WILL
LIKELY HAVE A SURFACE REFLECTION AND MAY CAUSE THE WINDS TO TURN
SOUTHEASTERLY OVER THE WESTERN PART OF THE STATE BY THE MIDDLE OF
NEXT WEEK.

&&

.MARINE...
MODERATE TO LOCALLY FRESH TRADE WINDS HAVE GENERATED A FRESH SWELL
WHICH CONTINUES TO PRODUCE SURF HEIGHTS ABOVE THE HIGH SURF ADVISORY
THRESHOLD ALONG EAST FACING SHORES OF MOST ISLANDS THROUGH TONIGHT.
WAVE HEIGHTS ARE EXPECTED TO GRADUALLY DIMINISH BELOW THIS THRESHOLD
TOMORROW. WILL KEEP AN EYE ON THE READINGS FROM THE MOKAPU BUOY
TONIGHT TO SEE IF THEY ARE ACTUALLY DROPPING. THAT BUOY IS NOW
READING AROUND 9 FEET WITH A PERIOD OF 10 SECONDS FROM 75 DEGREES.
THE SMALL CRAFT ADVISORY REMAINS IN EFFECT OVER MOST COASTAL WATERS
ZONES DUE TO SEAS OF 10 FEET OR GREATER AND FOR AREAS OF 25 KNOT
WINDS IN THE TYPICALLY WINDY MARINE ZONES.

A NEW WEST NORTHWEST SWELL WILL ARRIVE ON TUESDAY AND BUILD INTO
WEDNESDAY PRODUCING SURF APPROACHING THE HIGH SURF ADVISORY
THRESHOLDS ALONG NORTH AND WEST FACING SHORES OF MANY ISLANDS.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
HIGH SURF ADVISORY UNTIL 600 AM HST SUNDAY FOR EAST FACING SHORES
OF KAUAI OAHU MOLOKAI MAUI AND THE BIG ISLAND.

SMALL CRAFT ADVISORY UNTIL 600 AM HST SUNDAY FOR ALL HAWAIIAN
WATERS...EXCEPT THE MAUI COUNTY LEEWARD WATERS.

&&

HOUSTON