Flash Flood Warning 86, NWS Honolulu, HI

000
WGHW70 PHFO 192108
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
1105 AM HST SUN MAR 19 2006

HIC003-192230-
ISLAND OF OAHU IN HONOLULU COUNTY-
1105 AM HST SUN MAR 19 2006

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR THE ISLAND OF OAHU IN
HONOLULU COUNTY UNTIL 1230 PM HST...

AT 1100 AM HST...RADAR SHOWED MODERATE RAIN FALLING ACROSS MUCH OF 
OAHU...WITH HEAVY RAIN JUST SOUTH OF HONOLULU AND HAWAII KAI. THESE 
HEAVIER SHOWERS WERE SLOWLY DRIFTING NORTH. RAIN AMOUNTS SINCE 9 AM 
HAVE AROUND 1 INCH IN MOST LOCATIONS...WITH OVER 3 INCHES IN PARTS 
OF EWA BEACH AS WELL AS THE WINDWARD SIDE FROM HAUULA DOWN TO 
KAILUA. CIVIL DEFENSE HAS REPORTED MANY ROADS ACROSS THE ISLAND 
BEING WATER COVERED THIS MORNING...ESPECIALLY IN HONOLULU AND ALONG 
THE WINDWARD SIDE. 

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
KAHUKU...LAIE...HAUULA...WAIALUA...WAHIAWA...WAIKANE...
KAHALUU...HONOLULU...HAWAII KAI...WAIMANALO...MILILANI AND 
PUNALUU.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF
STREAMS...HIGHWAYS...UNDERPASSES 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 1230 PM HST IF
FLASH FLOODING CONDITIONS PERSIST.

LAT...LON 2125 15813 2129 15790 2127 15761 2174 15797
      2161 15818 2143 15811

$$

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

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HONOLULU HI
821 AM HST SUN MAR 19 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0650 AM     FLASH FLOOD      NAALEHU                 19.08N 155.57W
03/19/2006                   HAWAII             HI   EMERGENCY MNGR

            BIG ISLAND CIVIL DEFENSE REPORTS THAT HIGHWAY 11 IS
            CLOSED NEAR NAALEHU DUE TO FLOODING ALONG THE HIGHWAY IN
            THE KAU DISTRICT.

0810 AM     HEAVY RAIN       5 ENE HALEIWA           21.61N 158.04W
03/19/2006  U0.00 INCH       HONOLULU           HI   PUBLIC

            HEAVY RAIN CAUSING WATER ON THE KAM HIGHWAY BETWEEN
            SUNSET BEACH AND WAIMEA BAY

0810 AM     LIGHTNING        KAILUA                  21.40N 157.74W
03/19/2006                   HONOLULU           HI   PUBLIC

            LIGHTNING STRUCK AN ELECTRICAL SUBSTATION IN POHAKUPU
            CAUSING POWER OUTAGE

&&

NASH