Flash Flood Warning 22, NWS Honolulu, HI

140 
WGHW70 PHFO 150341
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
541 PM HST WED SEP 14 2016

HIC001-150600-
/O.CON.PHFO.FF.W.0022.000000T0000Z-160915T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HAWAII HI-
541 PM HST WED SEP 14 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 800 PM HST FOR THE
ISLAND OF HAWAII IN HAWAII COUNTY...

AT 535 PM HST...RADAR CONTINUES TO INDICATE HEAVY RAIN AND
THUNDERSTORMS ALONG THE HAMAKUA COAST. LOCAL LAW ENFORCEMENT REPORTS
FLOODING AND SIGNIFICANT RUN-OFF AND HAS DISPATCHED UNITS TO
PAAUILO. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO...
HONOKAA...HONOMU...KUKUIHAELE...WAIMANU VALLEY...WAIPIO VALLEY...
OOKALA...LAUPAHOEHOE...PAAUILO...AND PAPAIKOU.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING IN
STREAMS...ROADS...AND LOW LYING AREAS. MOVE TO HIGHER GROUND NOW.

DO NOT CROSS FAST FLOWING WATER IN YOUR VEHICLE...OR ON FOOT. TURN
AROUND...DON/T DROWN.

&&

THIS WARNING MAY NEED TO BE EXTENDED BEYOND 800 PM HST IF HEAVY RAIN
PERSISTS.

LAT...LON 1975 15510 1965 15518 2012 15579 2022 15574
      2012 15559 2013 15555 2011 15546 2001 15526
      1996 15519 1985 15509

$$

EATON

Area Forecast Discussion
National Weather Service Honolulu HI
410 PM HST WED SEP 14 2016

.SYNOPSIS...
A very moist and unstable weather pattern will continue as
abundant tropical moisture and an upper trough affects the state.
Heavy showers and thunderstorms will be possible through at least
Thursday. Drier conditions and a more stable airmass will return
over the weekend and early next week.

&&

.DISCUSSION...
A sharp upper trough with an axis extending form 34N141W to
17N160W passes directly over the islands and continues to
destabilize the atmosphere late this afternoon. Meanwhile,
abundant tropical moisture remains over the area from Oahu to the
Big Island. The afternoon sounding from Hilo showed about 3000
J/kg of CAPE, LI of -7 and PW of 1.7 inches, with somewhat less
values at Lihue. Given the moisture and instability in place
indicated by these environmental parameters, there is a potential
for more heavy rain and thunderstorms through Thursday. Thus, the Flash
Flood Watch remains in effect for Oahu to the Big Island through
Thursday afternoon. With already saturated grounds over these
islands, it will take less than normal amounts of rain to produce
flash flooding. The current radar shows much of the heavy showers
and thunderstorms have ended across the smaller islands, but
weather across the Big Island remains fairly active this
afternoon. The upper trough will remain over Hawaii through
Thursday and begin to shift westward on Friday. While the weather
across some of the state has calmed a bit, the instability and
moisture will remain over the area. Chances for heavy rain and
thunderstorms will be in the forecast through at least Thursday
night, and potentially into Friday as well.

Models show the area of deep tropical moisture will move west of
the islands by Saturday afternoon. We expect the upper trough
will pinch off into an upper low and drift west of the islands
this weekend, gradually allowing more stable air to move in from
the east. The subtropical high far to our north will shift
southward Thursday and Friday, allowing trade winds to gradually
build back in. We should be back in a more traditional trade wind
pattern this weekend and first half of next week.

&&

.AVIATION...
Moist trade wind flow will persist through 24 hours and beyond.
An upper level trough is enhancing instability across the state.
Localized heavy downpours and isolated thunderstorms can be
expect to persist through Thursday. AIRMET SIERRA for mountain
obscuration in cloud and showers is in effect Oahu, Maui County,
and portions of the Big Island but may be lifted later tonight.

SIGMET QUEBEC remains in effect for embedded thunderstorms along
and to the southeast of the upper level trough including the
whole of Maui County and the waters to its Northeast. QUEBEC
potentially impacts flights to and from the US mainland.

&&

.MARINE...
The current northwest swell will decline tonight. A moderate
size northwest swell is expected to arrive Friday and then peak
on Friday night and Saturday. Surf heights will stay below
advisory levels along north and west facing shores, with open
ocean swell heights peaking at around 5 feet in exposed waters.

Small swells arriving from the southern hemisphere will maintain
small to moderate surf along south facing shores over the next
couple of days, with largest surf expected Thursday. The Oahu
Surf Discussion (SRDHFO) has additional information regarding surf
and swell affecting the islands.

While sustained winds and seas are below Small Craft Advisory
(SCA) criteria, increasing trade winds are expected toward the
end of the week, as high pressure to the distant northeast moves
a little closer. Winds may become sufficiently strong to support
the issuance of a SCA for waters around Maui and the Big Island
around Friday.

Our airmass is moist and unstable now, and is expected to remain
that way through Thursday and possibly Friday as well. Heavy
showers and thunderstorms will bring marine hazards in the form of
cloud-to-surface lightning, low visibility, and locally erratic
winds across Hawaiian coastal and offshore waters.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
Flash Flood Watch through Thursday afternoon for Oahu-Molokai-
Lanai-Kahoolawe-Maui-Big Island.

&&

DISCUSSION/MARINE...Foster
AVIATION...Bedal

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HONOLULU HI
141 PM HST WED SEP 14 2016

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

0100 PM     DEBRIS FLOW      4 NW HANA               20.81N 156.04W
09/14/2016                   MAUI               HI   COUNTY OFFICIAL

            PIILANI HWY - 31 BETWEEN MILEMARKER 20 MANAWAINUI GULCH
            AND MILE MARKER 30 PAHIHI RIVER...FALLING ROCKS AND THE
            RIVERS ARE OVERFLOWING.

0100 PM     FUNNEL CLOUD     3 WSW PUKALANI          20.82N 156.38W
09/14/2016                   MAUI               HI   BROADCAST MEDIA

            FUNNEL CLOUD NEAR PULEHU ROAD.

0100 PM     DEBRIS FLOW      NNW LAHAINA             20.89N 156.67W
09/14/2016                   MAUI               HI   COUNTY OFFICIAL

            MALA WHARF CLOSED DUE TO DEBRIS FROM KAHOMA STREAM
            DIVERSION CHANNEL

0100 PM     HAIL             VOLCANO                 19.43N 155.24W
09/14/2016  E0.25 INCH       HAWAII             HI   PUBLIC

            SMALL PEA SIZED HAIL REPORTED BY PUBLIC FROM VOLCANO, BIG
            ISLAND.

&&

HFO