As Tropical Storm Olivia approached the islands from the east-northeast and then made a double landfall in Maui County on September 12th, it brought gusty winds and heavy precipitation.  Most of its effects were concentrated over Maui, Molokai, and Oahu.  The system downed trees, caused power outages and debris flows, and generated flash flooding.  The costs of damages had not yet been assessed.  There were no reports of serious injuries.

Strong Wind in OAHU KOOLAU, HAWAII
From 11-SEP-18 15:47:00 to 11-SEP-18 15:47:00 (HST-10)
Magnitude: 39.00 EG
Property damage: 0.00K
Crop damage: 2.00K
Reported by: Emergency Manager

Tree downed on Oahu over one lane of Likelike Highway near the tunnel, Kaneohe-bound.

Debris Flow in MAUI, HAWAII
From 12-SEP-18 00:56:00 to 12-SEP-18 06:48:00 (HST-10)
Location: KEANAE
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Hana Highway closed in both directions one mile west of Keanae on Maui due to a debris flow from heavy rain.

Strong Wind in WINDWARD HALEAKALA, HAWAII
From 12-SEP-18 07:11:00 to 12-SEP-18 07:54:00 (HST-10)
Magnitude: 43.00 EG
Property damage: 0.00K
Crop damage: 4.00K
Reported by: Department of Highways

Trees downed blocking Hana Highway on Maui at mile markers 21 and 26.

Strong Wind in OAHU SOUTH SHORE, HAWAII
From 12-SEP-18 11:25:00 to 12-SEP-18 11:25:00 (HST-10)
Magnitude: 35.00 EG
Property damage: 0.00K
Crop damage: 2.00K
Reported by: Emergency Manager

Tree downed at Diamond Head Road and Makalei Place on Oahu's south shore.

Flash Flood in HONOLULU, HAWAII
From 12-SEP-18 22:40:00 to 13-SEP-18 02:50:00 (HST-10)
Location: HONOLULU
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Kalihi Stream overflowed onto Dillingham Boulevard in Honolulu on Oahu, closing the roadway.

Flash Flood in HONOLULU, HAWAII
From 13-SEP-18 09:35:00 to 13-SEP-18 11:24:00 (HST-10)
Location: WAIKANE
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Waikane Stream overflowed after heavy rain and closed Kamehameha Highway on Oahu between Waikane Valley Road and Waiahole Valley Road.

Strong Wind in WINDWARD HALEAKALA, HAWAII
From 12-SEP-18 12:06:00 to 12-SEP-18 12:28:00 (HST-10)
Magnitude: 39.00 EG
Property damage: 0.00K
Crop damage: 2.00K
Reported by: Department of Highways

Downed trees reported on Maui at the intersection of Kawai Ola Place and Hana Highway near Hana, and two mile southeast of Nahiku along Hana Highway.

Strong Wind in OAHU NORTH SHORE, HAWAII
From 12-SEP-18 13:57:00 to 12-SEP-18 13:57:00 (HST-10)
Magnitude: 35.00 EG
Property damage: 0.00K
Crop damage: 2.00K
Reported by: Department of Highways

Ironwood tree felled by strong winds was blocking Kamehameha Highway near Sunset Elementary School.

Strong Wind in CENTRAL OAHU, HAWAII
From 12-SEP-18 14:08:00 to 12-SEP-18 14:08:00 (HST-10)
Magnitude: 35.00 EG
Property damage: 0.00K
Crop damage: 2.00K
Reported by: Department of Highways

Gusty winds caused a hanging limb from a tree on Lanikuhana Drive between Kamehameha Highway and Anania Drive in Mililani on Oahu.

Heavy Rain in HONOLULU, HAWAII
From 13-SEP-18 07:32:00 to 13-SEP-18 11:24:00 (HST-10)
Location: MOKULEIA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Heavy rain closed a potion of Kalanianaole Highway on Oahu near the Makapuu lighthouse in the Hawaii Kai-bound direction.

Heavy Rain in HAWAII, HAWAII
From 12-SEP-18 14:03:00 to 12-SEP-18 16:50:00 (HST-10)
Location: KAMUELA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in HONOLULU, HAWAII
From 12-SEP-18 12:15:00 to 12-SEP-18 18:07:00 (HST-10)
Location: WAHIAWA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in HAWAII, HAWAII
From 12-SEP-18 18:43:00 to 12-SEP-18 22:53:00 (HST-10)
Location: PUUANAHULU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in MAUI, HAWAII
From 12-SEP-18 19:34:00 to 12-SEP-18 21:15:00 (HST-10)
Location: SHIPWRECK BEACH
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in KAUAI, HAWAII
From 12-SEP-18 23:16:00 to 13-SEP-18 03:13:00 (HST-10)
Location: KALALAU LOOKOUT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in MAUI, HAWAII
From 12-SEP-18 23:18:00 to 13-SEP-18 01:18:00 (HST-10)
Location: SHIPWRECK BEACH
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in MAUI, HAWAII
From 13-SEP-18 00:01:00 to 13-SEP-18 02:47:00 (HST-10)
Location: KEPUHI
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in HONOLULU, HAWAII
From 13-SEP-18 02:53:00 to 13-SEP-18 05:33:00 (HST-10)
Location: MOKULEIA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in HAWAII, HAWAII
From 13-SEP-18 04:41:00 to 13-SEP-18 16:02:00 (HST-10)
Location: AKAKA FALLS ST PARK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in KAUAI, HAWAII
From 13-SEP-18 17:15:00 to 13-SEP-18 21:40:00 (HST-10)
Location: KOKEE STATE PARK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flash Flood in MAUI, HAWAII
From 12-SEP-18 12:00:00 to 12-SEP-18 17:39:00 (HST-10)
Location: KAMALO
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Deep water closed the roadway (Highway 450) near Kawela on the island of Molokai.

Strong Wind in OAHU KOOLAU, HAWAII
From 12-SEP-18 11:08:00 to 12-SEP-18 11:08:00 (HST-10)
Magnitude: 39.00 EG
Property damage: 0.00K
Crop damage: 2.00K
Reported by: Law Enforcement

Tree downed at Pali Lookout on Oahu.

Strong Wind in OAHU KOOLAU, HAWAII
From 12-SEP-18 11:49:00 to 12-SEP-18 11:49:00 (HST-10)
Magnitude: 39.00 EG
Property damage: 0.00K
Crop damage: 2.00K
Reported by: Emergency Manager

Another tree downed along Likelike Highway on Oahu near the tunnel in the Kaneohe-bound lane.

Flash Flood in MAUI, HAWAII
From 12-SEP-18 10:41:00 to 12-SEP-18 17:42:00 (HST-10)
Location: WAIANAPANAPA SP
Flood cause: Heavy Rain / Tropical System
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Deep water on Ulaino Road near Hana on Maui forced its closure. Waikoloa Road near Hana was also closed because of water on the roadway. Later in the day after 1400 HST, Honokohau Stream overflowed onto the bridge in Honokohau in West Maui and closed Honoapiilani Highway in that area.