Flash Flood Warning 28, NWS Honolulu, HI

626 
WGHW70 PHFO 282021
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
1021 AM HST MON JAN 28 2013

HIC009-282230-
/O.CON.PHFO.FF.W.0028.000000T0000Z-130128T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MAUI HI-
1021 AM HST MON JAN 28 2013

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

MAUI POLICE REPORT VERY HEAVY RAIN ALONG THE KAHEKILI HIGHWAY WEST 
OF WAILUKU. AT 1010 AM HST...RADAR SHOWED RAINFALL RATES IN EXCESS 
OF 5 INCHES PER HOUR IN THE SAME AREA. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO KAHAKULOA.

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 1230 PM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2106 15658 2093 15641 2085 15650 2096 15664

$$

POWELL

408 
WGHW70 PHFO 282203
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
1203 PM HST MON JAN 28 2013

HIC009-282211-
/O.CAN.PHFO.FF.W.0028.000000T0000Z-130128T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MAUI HI-
1203 PM HST MON JAN 28 2013

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

WEATHER RADAR SHOWED THAT HEAVY RAINFALL HAS WEAKENED AND MOVED 
OFFSHORE. THUS THE FLASH FLOOD WARNING IS CANCELLED.

A FLASH FLOOD WATCH FOR OAHU AND THE ISLANDS OF MAUI COUNTY REMAINS 
IN EFFECT UNTIL 6 PM HST TODAY.

LAT...LON 2106 15658 2093 15641 2085 15650 2096 15664

$$

POWELL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
351 AM HST MON JAN 28 2013

.SYNOPSIS...
A WEAKENING FRONTAL BOUNDARY HAS STALLED OUT ACROSS MOLOKAI THIS
MORNING. MODERATE TO HEAVY SHOWERS AND A SLIGHT CHANCE FOR
THUNDERSTORMS WILL PERSIST FOR OAHU THROUGH MAUI TODAY...THEN
SLOWLY DISPERSE THROUGH THE MIDDLE OF THE WEEK. TRADE WINDS WILL
BUILD BACK IN LATE TUESDAY AND FOCUS REMNANT MOISTURE OVER
WINDWARD AND MAUKA AREAS ESPECIALLY FOR MAUI AND BIG ISLAND.

&&

.DISCUSSION...
A WEAKENING FRONTAL BOUNDARY HAS STALLED OUT ACROSS MOLOKAI THIS
MORNING. AN ASSOCIATED SHORTWAVE TROUGH ALOFT IS LOCATED TO THE NORTH-
NORTHEAST OF THE STATE. CLOUDY SKIES WITH MODERATE TO LOCALLY
HEAVY SHOWERS WILL CONTINUE TO PERSIST ACROSS OAHU TO MAUI TODAY
NEAR THE BOUNDARY. A FLASH FLOOD WATCH IS IN EFFECT FOR OAHU AND
THE ISLANDS OF MAUI COUNTY THROUGH LATE THIS AFTERNOON FOR THE
THREAT OF HEAVY RAINS OVER ALREADY SATURATED GROUNDS. PLEASE SEE
THE FLASH FLOOD PRODUCT FFAHFO FOR MORE INFORMATION AND REASONING.
A SLIGHT CHANCE FOR THUNDERSTORMS WILL PERSIST THROUGH THE MORNING
HOURS ACROSS MAUI COUNTY. MEANWHILE...KAUAI IS POST-FRONTAL AND
SHOULD EXPECT COOLER NORTHEAST AIR AND GRADUALLY LESS SHOWERS
THROUGHOUT TODAY.

THE BIG ISLAND SHOULD REMAIN AHEAD OF THE FRONT...HOWEVER THERE IS
THE POSSIBILITY OF CONVECTIVE INTERIOR SHOWERS DEVELOPING THIS
AFTERNOON BECAUSE OF THE ONSHORE FLOW...AND NEARBY INSTABILITY AND
MOISTURE. IF CONVECTIVE SHOWERS DO DEVELOP...THERE IS A CHANCE OF
A SNOW SHOWERS AT THE BIG ISLAND SUMMITS. WINDS WILL BE JUST BELOW
ADVISORY LEVELS AT THE SUMMITS TODAY WITH THE NEARBY TROUGH
ALOFT...BUT SHOULD WEAKEN BY TONIGHT.

THE BOUNDARY IS EXPECTED DISSIPATE NEAR MAUI LATER TODAY AND TONIGHT
AS THE UPPER TROUGH SWINGS AWAY TO THE NORTHEAST. WINDS WILL BE
LIGHT AND VARIABLE TODAY...THEN LIGHT AND EASTERLY TONIGHT INTO
THE MIDDLE OF THE WEEK. THE EASTERLY PUSH IS FROM A WEAK RIDGE NOSING IN
NORTH OF THE STATE. THE SHOWERS ASSOCIATED WITH THE BOUNDARY
ACROSS THE CENTRAL PORTION OF THE STATE WILL SLOWLY DISPERSE
TONIGHT AND TUESDAY. LIGHTER SHOWERS COULD LINGER INTO WEDNESDAY
AND THURSDAY AS TRADE WINDS MAKE THEIR RETURN TO THE ISLANDS...BUT
RIDGING ALOFT WILL KEEP RAINFALL LIGHT. THESE SHOWERS WILL BE
MORE OF A WINDWARD / MAUKA DISTRIBUTION AS REMNANT MOISTURE FROM
THE DISSIPATED FRONT UPSTREAM IS FILTERED BACK OVER THE ISLANDS BY
THE TRADE WINDS. MOST OF THESE MIDWEEK SHOWERS WILL FOCUS ON MAUI
AND THE BIG ISLAND.

TRADE WINDS ARE EXPECTED STRENGTHEN BY THE END OF THIS WEEK AS A
HIGH PASSES BUILDS NORTH OF THE STATE. THE UPPER RIDGE WILL
MAINTAIN OVER HAWAII FROM TUESDAY INTO THIS WEEKEND.

&&

.AVIATION...
A LINE OF HEAVY SHOWERS WILL BRING TEMPO MVFR/IFR ACROSS MAUI COUNTY
TODAY.

AIRMET TANGO IS IN EFFECT OVER OAHU AND MAUI COUNTY FOR TEMPO MODERATE
TURB BETWEEN FL300 AND FL400. TEMPO MOD TURB ALSO BLW 090 FOR MAUI
COUNTY.

AIRMET SIERRA IS IN EFFECT FOR MOUNTAIN OBSC FOR MAUI COUNTY.
AIRMET ZULU IS IN EFFECT FOR MAUI COUNTY AND ADJ WATERS FOR MOD
RIME ICE IN PRECIPITATION LYR 125-180.

&&

.MARINE...
A VERY LARGE NORTHWEST SWELL WILL BUILD ACROSS HAWAIIAN WATERS TODAY.
BUOY 51101 IS SHOWING SWELL HEIGHTS OF 18 FEET AT 16 SECONDS...ABOUT
4 TO 5 FEET HIGHER THAN WAVEWATCH III DATA SUGGESTS. NORTH AND
WEST SHORES OF KAUAI AND OAHU SHOULD RAPIDLY INCREASE IN THE NEXT
FEW HOURS THIS MORNING...THEN CONTINUING DOWN THE ISLAND CHAIN.

HIGH SURF WARNINGS ARE IN EFFECT FOR NORTH AND WEST SHORES OF THE
SMALLER ISLANDS...AND A HIGH SURF ADVISORY IS IN EFFECT FOR THE
WEST SHORES OF THE BIG ISLAND. SEE CFWHFO ON OUR WEB PAGE FOR MORE
INFORMATION. A SMALL CRAFT ADVISORY FOR ALL HAWAIIAN COASTAL
WATERS ALSO GOES INTO EFFECT FOR COMBINED SEAS.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH THROUGH THIS AFTERNOON FOR OAHU-MOLOKAI-LANAI-
KAHOOLAWE-MAUI.

HIGH SURF WARNING UNTIL 6 AM HST TUESDAY FOR NORTH AND WEST
FACING SHORES OF NIIHAU KAUAI OAHU MOLOKAI AND NORTH FACING SHORES
OF MAUI.

HIGH SURF ADVISORY UNTIL 6 PM HST THIS EVENING FOR KONA-KOHALA.

SMALL CRAFT ADVISORY UNTIL 6 AM HST TUESDAY ALL HAWAIIAN COASTAL
WATERS.

&&

DISCUSSION/MARINE...FOSTER
AVIATION...MORRISON