Flash Flood Warning 10, NWS Honolulu, HI

118 
WGHW70 PHFO 260116
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
316 PM HST SUN MAY 25 2014

HIC003-260315-
/O.CON.PHFO.FF.W.0010.000000T0000Z-140526T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HONOLULU HI-
316 PM HST SUN MAY 25 2014

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR THE ISLAND OF OAHU IN
HONOLULU COUNTY UNTIL 515 PM HST...

HEAVY RAIN CONTINUES. THUNDERSTORMS AND HEAVY RAIN THAT STARTED NEAR 
PEARL CITY HAS SPREAD OVER THE ENTIRE ISLAND. SOME OF THE HEAVY RAIN 
SPREAD OVER THE KOOLAU MOUNTAINS TO THE WINDWARD SIDE AND NOW THE 
HEAVIEST RAIN IS MOVING WEST OVER THE WAIANAE MOUNTAINS. RADARS SHOW 
RAINFALL RATES NEAR 4 INCHES PER HOUR OVER THE WAIANAES. WE EXPECT 
THE RAIN TO TAPER OFF AS DAYTIME HEATING SUBSIDES...BUT STREAMS ARE 
RUNNING HIGH ISLAND-WIDE...AND THE HIGH WATER WILL TAKE SOME TIME TO 
SUBSIDE.

THE WARNING INCLUDES THE ENTIRE ISLAND OF OAHU.

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.

&&

RUNOFF FROM THIS STORM MAY ALSO CAUSE ROCK AND MUDSLIDES IN STEEP
TERRAIN.

THIS WARNING MAY NEED TO BE EXTENDED BEYOND 515 PM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2159 15831 2174 15795 2154 15776 2129 15761
      2127 15812

$$
DONALDSON

972 
WGHW70 PHFO 260203
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
403 PM HST SUN MAY 25 2014

HIC003-260315-
/O.CON.PHFO.FF.W.0010.000000T0000Z-140526T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HONOLULU HI-
403 PM HST SUN MAY 25 2014

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR THE ISLAND OF OAHU IN
HONOLULU COUNTY UNTIL 515 PM HST...

HEAVY RAIN CONTINUES OVER OAHU BUT THE RAIN IS SUBSIDING AND THE 
HEAVIEST SHOWERS ARE MOVING OFFSHORE TO THE WEST OF THE ISLAND. WE 
EXPECT THE RAIN TO CONTINUE TAPERING OFF AS DAYTIME HEATING 
SUBSIDES...BUT STREAMS ARE RUNNING HIGH ISLAND-WIDE...AND THE HIGH 
WATER WILL TAKE SOME TIME TO SUBSIDE.

THE FLASH FLOOD WARNING INCLUDES THE ENTIRE ISLAND OF OAHU.

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.

&&

RUNOFF FROM THIS STORM MAY ALSO CAUSE ROCK AND MUDSLIDES IN STEEP
TERRAIN.

THIS WARNING MAY NEED TO BE EXTENDED BEYOND 515 PM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2159 15831 2174 15795 2154 15776 2129 15761
      2127 15812

$$
DONALDSON

070 
WGHW70 PHFO 260309
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
509 PM HST SUN MAY 25 2014

HIC003-260316-
/O.EXP.PHFO.FF.W.0010.000000T0000Z-140526T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HONOLULU HI-
509 PM HST SUN MAY 25 2014

...THE FLASH FLOOD WARNING HAS EXPIRED FOR THE ISLAND OF OAHU IN
HONOLULU COUNTY...

WEATHER RADAR AND RAIN GAGES SHOWED THAT THE HEAVY RAINS HAVE 
ENDED...SO THE FLASH FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE.

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

LAT...LON 2159 15831 2174 15795 2154 15776 2129 15761
      2127 15812

$$
DONALDSON

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
1000 AM HST SUN MAY 25 2014

.SYNOPSIS...
A SURFACE TROUGH WILL PRODUCE LIGHT WINDS AND HUMID CONDITIONS
ACROSS THE AREA...WHILE A LOW ALOFT WILL BRING HEAVY SHOWERS AND
THUNDERSTORMS FROM KAUAI COUNTY TO MAUI COUNTY TODAY. SOME OF THESE
THUNDERSTORMS MAY PRODUCE FREQUENT LIGHTNING. THE THREAT OF
THUNDERSTORMS AND HEAVY SHOWERS WILL SUBSIDE ON MEMORIAL DAY AS
TRADE WINDS BUILD OVER THE ISLANDS. THE TRADES WILL FOCUS SHOWERS
OVER WINDWARD AREAS THROUGH THE NEW WORK WEEK.

&&

.DISCUSSION...
A NORTHEAST TO SOUTHWEST SURFACE TROUGH WILL REMAIN NEAR KAUAI AND
WEAKEN SLOWLY THROUGH TOMORROW EVENING. THERE WILL BE MODERATE EAST
SOUTHEAST WINDS NEAR THE BIG ISLAND AND LIGHT AND VARIABLE WINDS
OVER THE SMALLER ISLANDS TODAY. THE WINDS WILL BACK OUT OF THE EAST
AND STRENGTHEN THROUGH TOMORROW EVENING AS THE TROUGH WEAKENS AND
SURFACE HIGH PRESSURE BUILDS NORTH OF THE AREA. AN UNUSUALLY STRONG
LOW ALOFT SITS 230 MILES NORTHWEST OF KAUAI NEAR 24N 162W. A 250
MILE WIDE NORTHEAST TO SOUTHWEST CLOUD BAND ASSOCIATED WITH THESE
SYSTEMS COVERS THE ISLANDS FROM MAUI COUNTY TO KAUAI COUNTY.

THERE IS GOOD AGREEMENT BETWEEN THE GFS AND ECMWF MODELS THAT THE
LOW WILL MOVE SOUTH TODAY...THEN MOVE EAST AND WEAKEN STARTING
TONIGHT. THE LOW WILL BRING COLD TEMPERATURES ALOFT...KEEPING THE
ATMOSPHERE QUITE UNSTABLE. THE ATMOSPHERE OVER THE ISLANDS REMAINS
RATHER MOIST WITH THE 200 AM SOUNDING FROM LIHUE SHOWING 1.67 INCHES
OF PRECIPITABLE WATER. THE INSTABILITY AND MOISTURE WILL PROMOTE
THUNDERSTORM FORMATION TODAY WITH THE PROBABILITY HIGHEST OVER KAUAI
AND OAHU AND LOWEST ON THE BIG ISLAND. THE THUNDERSTORMS MAY PRODUCE
FREQUENT LIGHTNING AND HEAVY RAIN. AFTERNOON SHOWERS WILL FORM OVER
MAUI AND THE BIG ISLAND THIS AFTERNOON BUT THESE SHOWERS WILL BE
SPOTTY.

IT WILL REMAIN MOIST AND UNSTABLE AROUND KAUAI AND OAHU TONIGHT...
BUT HEAVY SHOWERS AND THUNDERSTORMS WILL BE MORE LIKELY OFFSHORE
THAN OVER THE ISLANDS AFTER SUNSET.

THE SURFACE TROUGH NEAR THE ISLANDS WILL WEAKEN TONIGHT AND WINDS
WILL SHIFT OUT OF THE EAST AND STRENGTHEN. THE DEVELOPING TRADE
WINDS WILL HELP CLEAR OUT SOME OF THE LOW LEVEL MOISTURE AND
VOLCANIC HAZE. MEANWHILE...THE LOW ALOFT WILL WEAKEN AND THE
ATMOSPHERE WILL BECOME MORE STABLE. LINGERING INSTABILITY WILL
MAINTAIN A THREAT FOR HEAVY SHOWERS AND THUNDERSTORMS NEAR KAUAI AND
OAHU TONIGHT. AS THE LOW ALOFT SHIFT FARTHER EAST HEAVY SHOWERS AND
THUNDERSTORMS MAY FORM OVER THE SLOPES OF MAUI AND THE BIG ISLAND
TOMORROW.

BY TUESDAY...MODERATE TO FRESH TRADE WINDS WILL BE WELL ESTABLISHED.
THE THREAT OF THUNDERSTORMS WILL END BUT THERE WILL LIKELY BE ENOUGH
MOISTURE AND INSTABILITY TO KEEP WINDWARD AREAS RATHER SHOWERY
THROUGH THE WEEK.

&&

.AVIATION...
MAIN FOCUS OF SHOWERS AND THUNDERSTORMS IS EXPECTED TO REMAIN OVER
KAUAI AND OAHU THROUGH THIS EVENING...BUT A CHANCE REMAINS OVER
MOLOKAI AND LANAI. AIRMET SIERRA FOR MOUNTAIN OBSCURATION IS UP FOR
KAUAI...AND AIRMETS FOR MOUNTAIN OBSCURATION MAY BE NEEDED FOR THE
OTHER ISLANDS THIS AFTERNOON. THE GREATEST THREAT OF MOUNTAIN
OBSCURATION WILL BE FOR MOLOKAI AND LANAI BUT LOCALIZED MVFR
CONDITIONS ARE POSSIBLE FOR MAUI AND THE BIG ISLAND.

&&

.MARINE...
MODERATE SOUTHEAST WINDS WILL CONTINUE AROUND THE BIG ISLAND...WITH
LIGHT AND VARIABLE WINDS ELSEWHERE OVER THE HAWAII COASTAL WATERS.
THE WINDS ARE EXPECTED TO SHIFT OUT OF THE EAST AND STRENGTHEN
STARTING THIS EVENING. WINDS MAY REACH THE SMALL CRAFT ADVISORY
THRESHOLD AROUND THE BIG ISLAND AND MAUI BY TUESDAY.

THE CURRENT SOUTH SWELL CONTINUES TO BUILD SLOWLY. SURF ALONG THE
SOUTH SHORES MAY APPROACH THE HIGH SURF ADVISORY THRESHOLD TODAY AND
CONTINUE THROUGH MONDAY. THIS SWELL WILL SLOWLY SUBSIDE TUESDAY AND
WEDNESDAY. AS THE TRADES STRENGTHEN...CHOPPY SURF WILL BUILD ALONG
EAST FACING SHORES BY MID-WEEK. ALSO...A NEW NORTHWEST SWELL
ARRIVING MONDAY NIGHT IS EXPECTED TO PRODUCE A SLIGHT BUMP IN SURF
FROM TUESDAY INTO THURSDAY.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

DONALDSON

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
212 PM HST SUN MAY 25 2014

HIZ005>011-260215-
CENTRAL OAHU-OAHU KOOLAU-OAHU NORTH SHORE-OAHU SOUTH SHORE-OLOMANA-
WAIANAE COAST-WAIANAE MOUNTAINS-
212 PM HST SUN MAY 25 2014

AT 206 PM HST...A STRONG THUNDERSTORM NEAR PEARL CITY WAS NEARLY
STATIONARY.

EXPECT INTENSE LIGHTNING FROM THIS STORM. DO NOT STAY IN THE OPEN NOR
SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN
A THUNDERSTORM APPROACHES. VERY HEAVY RAIN WILL FALL FROM THIS
STORM...AND WILL CAUSE WATER TO POND ON ROADS AND FILL POOR DRAINAGE
AREAS. THE RAIN WILL CAUSE RAPID RISES ON SMALL STREAMS AND CREEKS.