As a weak tropical disturbance with abundant low-level moisture moved through the islands, an upper low moved in from the northwest.  This combination generated heavy showers and thunderstorms, which then resulted in flash flooding over Maui, especially in the Iao Valley.  Other parts of the state received heavy rainfall as well.  An initial estimate of damages was about $15 million; though this was, apparently, for public costs.  No estimate was available for private losses.  No serious injuries were reported, though several residents from Iao Valley had to be rescued because of flood waters.

Heavy Rain in MAUI, HAWAII
From 12-SEP-16 18:16:00 to 12-SEP-16 23:46:00 (HST-10)
Location: PUUKOLII
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in MAUI, HAWAII
From 13-SEP-16 08:53:00 to 13-SEP-16 19:05:00 (HST-10)
Location: PAUWELA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flash Flood in MAUI, HAWAII
From 13-SEP-16 19:14:00 to 13-SEP-16 21:14:00 (HST-10)
Location: WAILUKU HEIGHTS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Flash flood waters along the Wailuku River inundated the Iao Valley.  There was significant damage at the Iao Valley State Park and Kepaniwai Heritage Gardens County Park.  Also, a debris flow and flooding occurred along Honoapiilani Highway between Maalaea and Lahaina.

Heavy Rain in HAWAII, HAWAII
From 13-SEP-16 14:09:00 to 13-SEP-16 17:05:00 (HST-10)
Location: HAKALAU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in HAWAII, HAWAII
From 13-SEP-16 19:21:00 to 13-SEP-16 21:47:00 (HST-10)
Location: PAPAIKOU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in HONOLULU, HAWAII
From 13-SEP-16 20:59:00 to 13-SEP-16 23:52:00 (HST-10)
Location: SCHOFIELD BARRACKS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in HAWAII, HAWAII
From 14-SEP-16 04:11:00 to 14-SEP-16 05:39:00 (HST-10)
Location: PAPAIKOU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in HAWAII, HAWAII
From 13-SEP-16 21:30:00 to 13-SEP-16 23:28:00 (HST-10)
Location: KAMUELA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in MAUI, HAWAII
From 14-SEP-16 10:14:00 to 14-SEP-16 13:12:00 (HST-10)
Location: HALAWA VALLEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in MAUI, HAWAII
From 14-SEP-16 11:04:00 to 14-SEP-16 13:53:00 (HST-10)
Location: KOELE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flash Flood in MAUI, HAWAII
From 14-SEP-16 13:00:00 to 14-SEP-16 14:45:00 (HST-10)
Location: NUU
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Streams were overflowing along Piilani Highway on Maui between mile markers 20 and 30, causing debris flows.

Heavy Rain in HAWAII, HAWAII
From 14-SEP-16 16:36:00 to 14-SEP-16 21:11:00 (HST-10)
Location: HAKALAU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flash Flood in MAUI, HAWAII
From 15-SEP-16 04:25:00 to 15-SEP-16 05:23:00 (HST-10)
Location: KEANAE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Part of the Hana Highway near Keanae in windward East Maui was closed due to a debris flow and high water.

Flash Flood in HAWAII, HAWAII
From 14-SEP-16 21:20:00 to 14-SEP-16 23:30:00 (HST-10)
Location: KIPAHULU
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

South Kopua Road was closed in Mountain View on the Big Island of Hawaii because of high water.

Heavy Rain in HAWAII, HAWAII
From 15-SEP-16 03:23:00 to 15-SEP-16 05:58:00 (HST-10)
Location: MOUNTAIN VIEW
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in MAUI, HAWAII
From 15-SEP-16 04:25:00 to 15-SEP-16 05:24:00 (HST-10)
Location: HALAWA VALLEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in HONOLULU, HAWAII
From 15-SEP-16 05:02:00 to 15-SEP-16 07:53:00 (HST-10)
Location: SCHOFIELD BARRACKS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flash Flood in MAUI, HAWAII
From 16-SEP-16 19:16:00 to 16-SEP-16 21:58:00 (HST-10)
Location: WAILUKU HEIGHTS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

An emergency manager reported two homes in Iao Valley inundated with water overflowing from the Wailuku River (Iao Stream).  The waterway had been rerouted by the extreme downpours that had occurred, and this was likely causing the problem of water getting into the residents' homes.

Heavy Rain in HONOLULU, HAWAII
From 13-SEP-16 12:44:00 to 13-SEP-16 14:42:00 (HST-10)
Location: KAAAWA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations