A cold front moving through the islands and an associated upper air trough combined to trigger heavy showers and isolated thunderstorms, including flash flooding in parts of Molokai, Maui, and Kauai.  There were no reports of serious injuries.  The costs of any property damage were not available.

Flash Flood in MAUI, HAWAII
From 18-JAN-21 17:37:00 to 18-JAN-21 17:58:00 (HST-10)
Location: HONOKOHAU
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Debris (large boulders) on Honoapiilani Highway in West Maui near mile marker 35 caused a road closure after heavy downpours.

Heavy Rain in KAUAI, HAWAII
From 17-JAN-21 16:37:00 to 17-JAN-21 21:40:00 (HST-10)
Location: KALALAU LOOKOUT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in HAWAII, HAWAII
From 17-JAN-21 19:07:00 to 17-JAN-21 21:42:00 (HST-10)
Location: KAMUELA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in MAUI, HAWAII
From 18-JAN-21 00:06:00 to 18-JAN-21 06:36:00 (HST-10)
Location: HALAWA VALLEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in MAUI, HAWAII
From 18-JAN-21 03:03:00 to 18-JAN-21 08:11:00 (HST-10)
Location: WAIKAPU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in HAWAII, HAWAII
From 18-JAN-21 08:53:00 to 18-JAN-21 11:58:00 (HST-10)
Location: UPOLU AIRPORT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in HONOLULU, HAWAII
From 18-JAN-21 10:17:00 to 18-JAN-21 13:18:00 (HST-10)
Location: PUNALUU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in MAUI, HAWAII
From 18-JAN-21 10:50:00 to 18-JAN-21 14:59:00 (HST-10)
Location: LAHAINALUNA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in MAUI, HAWAII
From 18-JAN-21 11:50:00 to 18-JAN-21 14:25:00 (HST-10)
Location: HALAWA VALLEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flash Flood in MAUI, HAWAII
From 18-JAN-21 17:04:00 to 18-JAN-21 23:11:00 (HST-10)
Location: KAMALO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain caused flooding, and road closures, over portions of Kamehameha Highway V near Kamalo and Pukoo on the island of Molokai.

Heavy Rain in MAUI, HAWAII
From 18-JAN-21 17:58:00 to 18-JAN-21 22:54:00 (HST-10)
Location: NAPILI
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in HONOLULU, HAWAII
From 19-JAN-21 05:38:00 to 19-JAN-21 08:32:00 (HST-10)
Location: HAUULA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in KAUAI, HAWAII
From 19-JAN-21 10:55:00 to 19-JAN-21 13:18:00 (HST-10)
Location: HANALEI
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flash Flood in KAUAI, HAWAII
From 19-JAN-21 14:23:00 to 19-JAN-21 21:54:00 (HST-10)
Location: PRINCEVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding caused a closure of Kuhio Highway near the Hanalei Bridge.

Heavy Rain in HAWAII, HAWAII
From 20-JAN-21 17:23:00 to 20-JAN-21 18:55:00 (HST-10)
Location: KONA VILLAGE RESORT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations