Flash Flood Warning 24, NWS Honolulu, HI

674 
WGHW70 PHFO 151427
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
427 AM HST THU SEP 15 2016

HIC009-151530-
/O.CON.PHFO.FF.W.0024.000000T0000Z-160915T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MAUI HI-
427 AM HST THU SEP 15 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 AM HST FOR THE
ISLAND OF MAUI IN MAUI COUNTY...

AT 417 AM HST...RADAR INDICATED THAT HEAVY RAIN WAS GRADUALLY
DIMINISHING OVER WINDWARD PORTIONS OF MAUI. STREAM GAGES INDICATED A
RAPID RISE IN WATER LEVELS IN THE LAST HOUR...BUT WATER LEVELS HAVE
BEGUN TO SLOWLY RECEDE. MAUI COUNTY CIVIL DEFENSE REPORTS A
LANDSLIDE ON THE HANA HIGHWAY BETWEEN MILE MARKERS 14 AND 15 THAT
HAS LEAD TO A COMPLETE CLOSURE OF THE HANA HIGHWAY. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO... 
WINDWARD EAST MAUI BETWEEN NAHIKU AND KIPAHULU AND WINDWARD 
WEST MAUI BETWEEN KAHAKULOA AND WAIEHU...INCLUDING HONOKOHAU...
PAUWELA...HUELO...KAUPO...AND WAIEHU.

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 530 AM HST IF HEAVY RAIN
PERSISTS.

LAT...LON 2064 15607 2063 15619 2087 15640 2080 15657
      2099 15668 2104 15660 2090 15648 2092 15639
      2095 15634 2094 15625 2082 15611 2080 15601
      2073 15599

$$

BIRCHARD

057 
WGHW70 PHFO 151506
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
506 AM HST THU SEP 15 2016

HIC009-151530-
/O.CON.PHFO.FF.W.0024.000000T0000Z-160915T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MAUI HI-
506 AM HST THU SEP 15 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 AM HST FOR THE
ISLAND OF MAUI IN MAUI COUNTY...

AT 505 AM HST...RADAR AND STREAM GAGES INDICATED THAT HEAVY
RAIN...AND THE THREAT OF FLASH FLOODING...HAD DIMINISHED OVER WEST
MAUI. RAINFALL WAS ALSO GRADUALLY DIMINISHING OVER THE HANA COAST
AND SLOPES...BUT ADDITIONAL HEAVY SHOWERS AND THUNDERSTORMS WERE
JUST OFFSHORE TO THE EAST...AND MAY MOVE ASHORE. THUS THE WARNING
REMAINS IN EFFECT FOR WINDWARD EAST MAUI. HANA HIGHWAY REMAINS
CLOSED DUE TO A LANDSLIDE NEAR MILE MARKER 15 IN KEANAE. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO...
HAIKU-PAUWELA...KAUPO...PAUWELA...HUELO...KIPAHULU...
NAHIKU...HANA...KAILUA...WAILUA...HAMOA AND HALEAKALA NATIONAL PARK.

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 530 AM HST IF HEAVY RAIN
PERSISTS.

LAT...LON 2064 15607 2063 15619 2095 15634 2094 15625
      2082 15611 2080 15601 2073 15599

$$

BIRCHARD

927 
WGHW70 PHFO 151523
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
523 AM HST THU SEP 15 2016

HIC009-151531-
/O.EXP.PHFO.FF.W.0024.000000T0000Z-160915T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MAUI HI-
523 AM HST THU SEP 15 2016

...THE FLASH FLOOD WARNING FOR THE ISLAND OF MAUI IN MAUI COUNTY WILL
EXPIRE AT 530 AM HST...

RAINFALL HAS DIMINISHED...FLOOD WATERS HAVE RECEDED...AND ARE NO
LONGER EXPECTED TO POSE A THREAT TO LIFE OR PROPERTY. ADDITIONAL
HEAVY RAIN IS POSSIBLE LATER THIS MORNING OR AFTERNOON...AND A FLASH
FLOOD WATCH REMAINS IN EFFECT. 

LAT...LON 2064 15607 2063 15619 2095 15634 2094 15625
      2082 15611 2080 15601 2073 15599

$$

BIRCHARD

Area Forecast Discussion
National Weather Service Honolulu HI
820 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...
Weak troughing persists across the main Hawaiian Islands, pulling
abundant tropical moisture northward as fuel for continued bouts
of heavy showers and thunderstorms. A persistent upper trough
directly across the islands continues to destabilize our airmass.
Afternoon soundings showed lifted index values between -5 and -7,
with CAPE over 2000 j/kg and about 1.6 inches of PW. This
combination of abundant moisture and instability will maintain the
threat for flash flooding, and a Flash Flood Watch remains in
effect through Thursday afternoon for all islands from Oahu
eastward.

The surface trough across the islands slackens the pressure
gradient between the subtropical ridge to our north and equatorial
low pressure, keeping trade winds rather light near the eastern
islands. Slightly stronger trades are noted west of the trough
axis, mainly across Kauai and Oahu. The current bout of heavy
showers and thunderstorms over and near Maui and the Big Island
lies east of the sharp upper trough axis, which extends
northeastward from 18N161W through 28N150W and 34N140W. This
activity could spread west to Molokai and Oahu at any time over
the next day or so, producing wet and sloppy conditions similar
to those seen across Honolulu last night.

Models show the area of abundant 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
strengthen. 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 across the islands through at
least Thursday morning, while an upper level trough lingers in the
vicinity as well. Thus airmass in the area remains moist and unstable,
with localized heavy downpours and isolated thunderstorms possible
across the area at least through early Thursday.

AIRMET SIERRA for mountain obscuration remains in effect for Oahu,
Maui County, and portions of the Big Island this evening and may be
lifted if conditions improve later.

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 much of the Big Island. This SIGMET may need to
be extended if the convection persists.

&&

.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...Powell
AVIATION...Hui

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HONOLULU HI
1005 PM HST WED SEP 14 2016

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

0900 PM     FLOOD            MOUNTAIN VIEW           19.52N 155.15W
09/14/2016                   HAWAII             HI   EMERGENCY MNGR

            NORTH PECK ROAD CLOSED DUE TO DOWNED TREE

0920 PM     FLOOD            MOUNTAIN VIEW           19.52N 155.15W
09/14/2016                   HAWAII             HI   EMERGENCY MNGR

            SOUTH KOPUA ROAD FLOODED 1.5 MILES FROM HIGHWAY 11.
            TRAFFIC RE-ROUTED THROUGH FARM LOTS.

&&

BIRCHARD