Flash Flood Warning 85, NWS Honolulu, HI

000
WGHW70 PHFO 191851
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
850 AM HST SUN MAR 19 2006

HIC001-192000-
ISLAND OF HAWAII IN HAWAII COUNTY-
850 AM HST SUN MAR 19 2006

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR THE ISLAND OF HAWAII
IN HAWAII COUNTY UNTIL 1000 AM HST...

AT 850 AM HST...RADAR CONTINUED TO SHOW WIDESPREAD MODERATE TO HEAVY 
RAINS ACROSS MUCH OF KAU...PUNA AND HILO DISTRICTS OF THE BIG 
ISLAND. RAIN GAGES INDICATE MANY LOCATIONS HAVE RECEIVED 1 TO 2 
INCHESOF RAIN SINCE 6 AM. COUNTY CIVIL DEFENSE REPORTS THAT HIGHWAY 
11 IS STILL CLOSED BETWEEN KAWA FLATS AND NAALEHU. OTHER ROADS IN 
THE PUNA AND HILO AREAS HAVE SIGNIFICANT PONDING...BUT ARE OPEN AT 
THIS TIME. 

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
PEPEEKEO...PAPAIKOU...HILO...KEAAU...HAWAIIAN PARADISE PARK...
HAWAIIAN BEACHES...KAPOHO...PAHOA...GLENWOOD...MOUNTAIN VIEW...
VOLCANO...PAHALA...WOOD VALLEY AND KAWA FLATS.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF
STREAMS...HIGHWAYS...AND LOW LYING AREAS.

MOTORISTS SHOULD BE ALERT FOR FLOODING AND SHOULD NOT ATTEMPT TO
CROSS FAST FLOWING OR RISING WATER. MANY FLASH FLOOD DEATHS OCCUR
WHEN MOTORISTS TRY CROSSING FLOODED ROADWAYS. TURN AROUND...DON/T
DROWN.

THE FLASH FLOOD WARNING MAY NEED TO BE EXTENDED BEYOND 1000 AM HST IF
FLASH FLOODING CONDITIONS PERSIST.

LAT...LON 1888 15571 1946 15474 1969 15496 1989 15510
      1950 15525 1908 15577

$$

NASH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
400 AM HST SUN MAR 19 2006

.SYNOPSIS...
UNSTABLE SHOWERY WEATHER WILL CONTINUE ACROSS THE MAIN HAWAIIAN
ISLANDS THROUGH THE FORECAST PERIOD...THANKS TO PERSISTENT LOW
PRESSURE TO OUR WEST. WINDS WILL REMAIN RATHER LIGHT...CAUSING
RAINFALL TO INCREASE FROM LATE MORNING THROUGH EVENING EACH DAY THEN
DECREASE AT NIGHT. THUNDERSTORMS AND HEAVY RAINFALL ARE POSSIBLE
THROUGH TODAY.

&&

.DISCUSSION...
MODERATE TO HEAVY SHOWERS PERSIST ACROSS SOUTHEAST PORTIONS OF THE
BIG ISLAND...BUT UNTIL RECENTLY SHOWERS HAVE DIMINISHED ELSEWHERE
ACROSS THE REMAINING ISLANDS OVERNIGHT. WE ARE SEEING A RESURGENCE
IN SHOWER DEVELOPMENT OVER WATER NEAR KAUAI WITHIN THE PAST FEW
HOURS. OVERNIGHT SOUNDINGS SHOWED THE ATMOSPHERE REMAINS WET AND
UNSTABLE WITH K INDICES OF 30 OR GREATER AND PRECIPITABLE WATER
BETWEEN 1.55 AND 1.8 INCHES. THE ATMOSPHERE IS RIPE FOR HEAVY
RAINFALL. ALL THAT IS NEEDED IS A CONVECTIVE TRIGGER LIKE DAYTIME
HEATING OR AN INTERACTION OF OUTFLOW BOUNDARIES.

THE CURRENT UNSTABLE AND WET WEATHER PATTERN WILL CONTINUE THROUGH
THE FORECAST PERIOD. AN UPPER TROUGH 300 TO 500 MILES WEST OF THE
MAIN ISLANDS IS CONSOLIDATING INTO AN UPPER LOW...A FEATURE THAT THE
STORM TRACK WESTERLIES WILL HAVE GREAT DIFFICULTY DIGGING OUT FOR
THE NEXT WEEK. GFS75 SHOWS THIS UPPER LOW WILL OPEN UP INTO A TROUGH
AGAIN LATE FRIDAY...BUT WILL REMAIN ANCHORED WEST OF THE ISLANDS
INTO NEXT WEEKEND. THIS PERSISTENT TROUGHING ALOFT WILL INDUCE A
SURFACE TROUGH WEST OF THE ISLANDS AS WELL THROUGH THE NEXT WEEK...A
FEATURE WHICH WILL KEEP OUR WINDS LIGHT AND THE ISLANDS SUBJECT TO
INCREASED DAYTIME RAINFALL DUE TO HEATING.

LATEST GFS75 BRINGS PULSES OF HEAVY RAINFALL TO THE ISLANDS OVER THE
COMING WEEK. TODAY...WEDNESDAY AND FRIDAY ARE THE DAYS THESE PULSES
ARRIVE...COINCIDING WITH THE FORECAST FORMATION AND PASSAGE OF SHORT
WAVES ALOFT. THE FORECAST CALLS FOR THE POSSIBILITY OF HEAVY
RAINFALL AND THUNDERSTORMS THROUGH TODAY. A FLASH FLOOD WATCH
REMAINS IN EFFECT THROUGH MONDAY EVENING TO ACCOUNT FOR JUST
MODERATE RAINFALL POTENTIALLY TRIGGERING FLOODING ACROSS SOAKED AND
SATURATED GROUND.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...

FLASH FLOOD WATCH...ALL ISLANDS THROUGH MONDAY EVENING.

&&

POWELL