Flash Flood Warning 1, NWS Honolulu, HI

059 
WGHW70 PHFO 010626
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
826 PM HST TUE DEC 31 2013

HIC001-010628-
/O.CAN.PHFO.FF.W.0001.000000T0000Z-140101T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HAWAII HI-
826 PM HST TUE DEC 31 2013

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

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

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

LAT...LON 2020 15564 2016 15534 2003 15544 1997 15557

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
358 PM HST TUE DEC 31 2013

.SYNOPSIS...
DRY AND STABLE CONDITIONS WITH AFTERNOON SEA BREEZES ARE EXPECTED
WEDNESDAY. INTERIOR CLOUDS AND SHOWERS WILL DEVELOP...ESPECIALLY
OVER THE BIG ISLAND. A FRONTAL SYSTEM WILL APPROACH THE STATE
WEDNESDAY NIGHT AND AFFECT THE AREA INTO THE EARLY WEEKEND WITH
INCREASING CLOUDS AND SHOWERS.

&&

.DISCUSSION...
THE SIGNIFICANT WEATHER FEATURE OF THE PAST SEVERAL DAYS...A MID
AND UPPER-LEVEL TROUGH...HAS FINALLY MIGRATED TO THE EAST OF THE
BIG ISLAND WITH NORTH TO NORTHWEST WINDS MOVING IN ALOFT. SURFACE
WINDS HAVE GENERALLY BEEN LIGHT...WITH SEA BREEZES IMPACTING THE
MAJORITY OF LEEWARD AREAS. INTERIOR CONVECTION ON THE BIG ISLAND
WILL PERSIST INTO THE EARLY EVENING WITH THE POTENTIAL FOR
LOCALIZED MINOR FLOODING FOR SOME WINDWARD AREAS THAT REMAIN
SATURATED AFTER MORE THAN 48 HOURS OF RAINFALL. THIS CONVECTION
WILL NOT LIKELY BE ENOUGH TO PRODUCE ENOUGH HEAVY RAINFALL TO
WARRANT THE CONTINUATION OF THE FLASH FLOOD WATCH...SO THAT
PRODUCT HAS BEEN CANCELLED.

OVERNIGHT...WITH GENERALLY LIGHT WIND FLOW IN PLACE...ONLY WEAK
TRADES MAY BE PRESENT OVER WINDWARD AREAS...WITH GENERALLY
OFFSHORE WINDS ELSEWHERE. A DRY AIRMASS APPARENT ON SATELLITE
IMAGERY AND LOCAL SOUNDING DATA WILL LIMIT PRECIPITATION CHANCES
FOR MOST LOCATIONS.

ONSHORE WINDS ARE EXPECTED TO DEVELOP AS THE PRESSURE GRADIENT
REMAINS WEAK DURING THE DAY ON WEDNESDAY AHEAD OF AN APPROACHING
FRONT. INTERIOR CONVECTION AND CLOUDS WILL LIKELY DEVELOP ON MOST
ISLANDS...WITH THE BEST CHANCE OF PRECIPITATION OVER INTERIOR BIG
ISLAND WHERE DEEPER MOISTURE EXISTS.

THE NEXT WEATHER FEATURE OF NOTE REMAINS A COLD FRONT AND ITS
ASSOCIATED MID AND UPPER-LEVEL TROUGH SLATED TO BEGIN IMPACTING
THE STATE WEDNESDAY NIGHT. GLOBAL MODELS ARE IN GOOD AGREEMENT IN
TURNING SURFACE WINDS TO THE SOUTH AND SOUTHWEST AHEAD OF THE
FRONT WEDNESDAY NIGHT INTO THURSDAY WITH HAZE...VOG...AND MUGGY
CONDITIONS MOVING. TWO CHANCES FOR SIGNIFICANT RAINFALL ARE
EXPECTED WITH THE FRONT...FIRST...JUST AHEAD OF THE FRONT IN PRE-
FRONTAL CONVERGENCE...AND SECOND...ALONG THE FRONTAL BAND ITSELF.

DRIER AND COOLER AIR IS THEN EXPECTED TO FILTER IN BEHIND THE
FRONT FOR PORTIONS OF THE WEEKEND.

&&

.AVIATION...
AIRMET SIERRA FOR MOUNTAIN OBSCURATION REMAINS IN EFFECT FOR
WINDWARD PARTS OF THE BIG ISLAND DUE TO PERSISTENT CLOUDINESS AND
SCATTERED SHOWERS. WITH PLENTY OF LOW LEVEL MOISTURE IN PLACE EXPECT
THOSE CONDITIONS TO LINGER ON THE BIG ISLAND INTO THE EVENING HOURS
AND POSSIBLY THROUGH THE NIGHT.

EXPECT VFR CONDITIONS TO PREVAIL ACROSS THE REMAINDER OF THE
HAWAIIAN ISLANDS TONIGHT AND WEDNESDAY. ISOLATED SHOWERS AND MVFR
CIGS WILL FOCUS PRIMARILY ON WINDWARD SLOPES TONIGHT...BECOMING
POSSIBLE IN SOME LEEWARD AND INTERIOR SECTIONS WEDNESDAY AFTERNOON
AS A SEABREEZE PATTERN DEVELOPS ACROSS THE STATE.

&&

.MARINE...
WINDS AND SEAS ARE ON THE DECLINE...HOWEVER ANOTHER ROUND OF
SMALL CRAFT ADVISORY CONDITIONS WILL BE POSSIBLE AS EARLY AS
THURSDAY AS A FRONTAL SYSTEM APPROACHES THE STATE AND WINDS
INCREASE FROM THE SOUTH.

THE CURRENT NORTHWEST SWELL IS EXPECTED TO CONTINUE TO DECLINE
OVERNIGHT...BEFORE ANOTHER MODERATE SWELL ARRIVES FROM THE NORTHWEST
LATE THURSDAY AND BUILDS LARGER INTO THE WEEKEND.

&&

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

&&

DISCUSSION/MARINE...CANTIN
AVIATION...JACOBSON