Flash Flood Warning 2, NWS Honolulu, HI

861 
WGHW70 PHFO 271521
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
521 AM HST MON APR 27 2015

HIC009-271700-
/O.CON.PHFO.FF.W.0002.000000T0000Z-150427T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MAUI HI-
521 AM HST MON APR 27 2015

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR THE ISLAND OF MAUI IN
MAUI COUNTY UNTIL 700 AM HST...

THE GAUGE ON HONOPOU STREAM CONTINUED TO REPORT A WATER LEVEL NEAR 
THE FLOOD STAGE. ALSO...RADAR DATA CONTINUED TO SHOW RAIN OVER 
NORTHEAST MAUI.

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

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 700 AM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2096 15636 2096 15624 2084 15608 2073 15624

$$

500 
WGHW70 PHFO 271647
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
647 AM HST MON APR 27 2015

HIC009-271654-
/O.CAN.PHFO.FF.W.0002.000000T0000Z-150427T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MAUI HI-
647 AM HST MON APR 27 2015

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

WEATHER RADAR AND RAIN GAGES SHOWED THAT THE HEAVY RAINS HAVE 
DIMINISHED. THUS THE FLASH FLOOD WARNING IS CANCELLED. HOWEVER...THE 

HEAVY RAINS HAVE DIMINISHED AND STREAM GAGES HAVE DROPPED BELOW 
FLOOD LEVELS. HOWEVER...MODERATE TO LOCALLY HEAVY RAIN REMAINS 
ANCHORED ACROSS THE TERRAIN AND STREAMS WILL REMAIN ELEVATED FOR 
SEVERAL HOURS. THEREFORE...THE FLASH FLOOD WARNING HAS BEEN 
CANCELLED...AND WILL BE REPLACED BY A FLOOD ADVISORY. 

LAT...LON 2096 15636 2096 15624 2084 15608 2073 15624

$$

BRAVENDER

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
400 AM HST MON APR 27 2015

.SYNOPSIS...
A SLOW-MOVING FRONT WILL SPREAD MODEST RAIN FROM MAUI TO THE BIG
ISLAND THROUGH TONIGHT. LIGHT SOUTHERLY WINDS AHEAD OF THE FRONT
WILL TURN INTO BREEZY TRADE WINDS BEHIND IT. ACTIVE SHOWERS WILL
CONTINUE OVER WINDWARD SLOPES THROUGH MUCH OF THE WEEK...BUT LEE
AREAS SHOULD START TO DRY OUT BY TUESDAY.

&&

.DISCUSSION...
A SLOW-MOVING FRONTAL CLOUD BAND BECAME MORE DIFFUSE OVER MAUI
COUNTY DURING THE PAST SIX HOURS. HOWEVER...IN THE PROCESS THIS
FEATURE SHED ITS LOAD OF WATER VAPOR ONTO NORTH SLOPES OF MAUI AND
MOLOKAI...WHERE OROGRAPHIC FORCING PRODUCED PERSISTENT RAIN.
ALTHOUGH THE RAIN SHOULD DIMINISH AS THE REMNANTS OF THE FRONT MOVE
TOWARD THE BIG ISLAND...SATURATED SOIL WILL INCREASE THE RISK OF
FLOODING OVER NORTH MAUI THROUGH MUCH OF THE MORNING. CONVERGENCE
BETWEEN SOUTHEAST AND MORE SOUTHERLY OR SOUTHWESTERLY WINDS
SUPPORTED LIMITED SHOWER DEVELOPMENT AHEAD OF THE FRONT...MAINLY IN
COMBINATION WITH CONVERGENCE PRODUCED BY LAND BREEZES JUST OFFSHORE
FROM THE BIG ISLAND.

SLOWLY DISSIPATING CLOUD LAYERS WILL OBSCURE THE SKY AND DROP A FEW
SPRINKLES ON BOTH SIDES OF THE MAIN RAIN BAND. FURTHER TO THE
NORTHWEST...RELATIVELY CLEAR CONDITIONS IN THE IMMEDIATE AFTERMATH
OF THE FRONTAL CLOUD BAND WILL YIELD TO COLD-AIR CUMULI...AND THEN A
NEARLY SOLID STRATUS OVERCAST...AT LEAST UNTIL THE AIR MASS MODIFIES.

GUIDANCE AGREED WELL IN PREDICTING THE SHALLOW TROUGH ALOFT
CURRENTLY SUPPORTING THE WEAKENING FRONT TO SHIFT SOUTHEAST AND
WEAKEN FURTHER THROUGH WEDNESDAY. SOLID RIDGING ALOFT BUILDING IN
FROM THE NORTHWEST WILL SUPPORT THE RAPID DEVELOPMENT OF THE SURFACE
HIGH BEHIND THE FRONT...BRINGING MODERATE TO STRONG WINDS SHORTLY
AFTER FRONTAL PASSAGE. THESE WINDS WILL HAVE MORE OF AN EASTERLY
COMPONENT THAN IS USUAL IN SUCH CASES...SO ONE COULD SAY SIMPLY THAT
MODERATE TO STRONG TRADE WINDS WILL RETURN TO NEARLY ALL OF THE
STATE BY THIS EVENING...AND THEN PERSIST THROUGH MOST OF THE WEEK.

AS THE FRONTAL CLOUD BAND FALLS APART...IT WILL SHED ITS LOAD OF
WATER VAPOR ONTO THE TRADES. THE WINDS IN TURN WILL CARRY THIS MOIST
AIR MASS OVER THE STATE AGAIN...MAINTAINING CONTINUED RAINFALL OVER
WINDWARD SLOPES. LEE AREAS SHOULD EXPERIENCE SOME DRYING BY
MID-WEEK...BUT A FEW SHOWERS BLOOMING WINDWARD WILL CONTINUE TO
DRIFT LEEWARD BEFORE DISSIPATING. THUS...CONDITIONS WILL REMAIN ON
THE WET SIDE OF USUAL THROUGH THE FORECAST PERIOD...ESPECIALLY OVER
MAUI COUNTY AND THE BIG ISLAND...WHERE MOST OF THE FRONTAL REMNANTS
WILL RESIDE AT FIRST.

BY THE WEEKEND...MOST SOLUTIONS PREDICTED A WEAK MID-LEVEL TROUGH TO
ERODE THE RIDGE SOMEWHAT FROM THE WEST...REDUCING SUPPORT FOR THE
SURFACE RIDGE AS WELL. ALSO...BY THAT TIME MOST OF THE FRONTAL
REMNANTS SHOULD PASS THE STATE...LEADING TO MORE MODERATE...SLIGHTLY
DRIER TRADE-WIND CONDITIONS.

&&

.MARINE...
A NEW NORTHERLY SWELL EXPECTED TO ARRIVE TODAY LIKELY WILL BUILD
SURF HEIGHTS TO THE THRESHOLDS FOR A HIGH SURF ADVISORY ALONG NORTH-
AND EAST-FACING SHORES. THIS SWELL WILL CONTINUE TO ARRIVE INTO
TUESDAY...AND THEN WILL LOWER GRADUALLY ON WEDNESDAY. STRENGTHENING
TRADE WINDS WILL KEEP SHORT-PERIOD CHOPPY SURF ELEVATED ALONG
EAST-FACING SHORES THROUGH MOST OF THE WEEK.

STRONG HIGH PRESSURE BUILDING TO THE NORTH WILL INCREASE TRADE WINDS
OVER THE AREA THROUGH MID-WEEK. WINDS AND SEAS WILL EXCEED
THRESHOLDS FOR A SMALL CRAFT ADVISORY ACROSS MOST OF THE AREA BY
AROUND MONDAY MORNING.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
HIGH SURF ADVISORY UNTIL 6 PM HST TUESDAY FOR NIIHAU-KAUAI
WINDWARD-KAUAI LEEWARD-OAHU NORTH SHORE-OAHU KOOLAU-OLOMANA-
MOLOKAI-MAUI WINDWARD WEST-MAUI CENTRAL VALLEY-WINDWARD
HALEAKALA.

SMALL CRAFT ADVISORY UNTIL 6 AM HST TUESDAY FOR KAUAI NORTHWEST
WATERS-KAUAI WINDWARD WATERS-KAUAI LEEWARD WATERS-KAUAI CHANNEL-
OAHU WINDWARD WATERS-OAHU LEEWARD WATERS-KAIWI CHANNEL-MAUI
COUNTY WINDWARD WATERS-MAALAEA BAY-PAILOLO CHANNEL-ALENUIHAHA
CHANNEL.

&&

RYSHKO