A surface front and a deep upper low, known locally as a kona low, produced heavy and sustained showers and thunderstorms as tropical moisture was pulled north over the Aloha State.  The downpours also led to instances of flash flooding.  Also, high winds and wintry conditions affected the mountain summits on the Big Island and Haleakala on Maui. No significant injuries were reported.  The costs of any damages were not available.

Heavy Rain in HONOLULU, HAWAII
From 05-DEC-21 09:40:00 to 05-DEC-21 11:00:00 (HST-10)
Location: VILLAGE PARK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in MAUI, HAWAII
From 05-DEC-21 11:51:00 to 05-DEC-21 14:48:00 (HST-10)
Location: SHIPWRECK BEACH
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flash Flood in MAUI, HAWAII
From 05-DEC-21 20:48:00 to 06-DEC-21 08:55:00 (HST-10)
Location: KAHULUI
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding was reported at the Krispy Kreme in Kahului.  More flooding occurred in the Wakea Business Center in Kahului, and around the Puunene Bridge.  A little later, about 2100 HST, multiple homes were flooded in Maui Meadows, and a few vehicles were washed away.

Flash Flood in MAUI, HAWAII
From 05-DEC-21 18:38:00 to 06-DEC-21 08:15:00 (HST-10)
Location: KAMALO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

With deep water covering the roadway, Kamehameha V Highway became impassable near mile marker 8 on the island of Molokai.

Flash Flood in HAWAII, HAWAII
From 06-DEC-21 11:54:00 to 06-DEC-21 13:43:00 (HST-10)
Location: NAALEHU
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Highway 11 was closed in the Kawa Flats area of the Kau District on the Big Island of Hawaii because of deep water on the roadway.

Flash Flood in HONOLULU, HAWAII
From 06-DEC-21 14:23:00 to 07-DEC-21 04:15:00 (HST-10)
Location: MAILI
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding waters covered a portion of Kapaa Quarry Road and Kamehameha Hwy near Kahaluu in windward Oahu, as well as a portion of H-1 in downtown Honolulu. Flood waters also entered homes in Pearl City and Moiliili and an electrical substation in Iwilei. Landslides also blocked portions of Kamehameha Hwy near Kaaawa and Farrington Hwy near Makua Valley.

Heavy Rain in HAWAII, HAWAII
From 06-DEC-21 13:43:00 to 06-DEC-21 16:17:00 (HST-10)
Location: PAPAIKOU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

High Wind in BIG ISLAND SUMMIT, HAWAII
From 04-DEC-21 00:59:00 to 05-DEC-21 04:29:00 (HST-10)
Magnitude: 91.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Winds, from various directions, gusted over 100 mph during a period that lasted more than one day over the summits of Mauna Kea and Mauna Loa on the Big Island of Hawaii. Winds also gusted over 90 mph on the Haleakala Summit on Maui.

Heavy Rain in MAUI, HAWAII
From 03-DEC-21 05:16:00 to 03-DEC-21 08:12:00 (HST-10)
Location: HALAWA VALLEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in MAUI, HAWAII
From 03-DEC-21 13:32:00 to 03-DEC-21 16:42:00 (HST-10)
Location: NAPILI
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Winter Storm in BIG ISLAND SUMMIT, HAWAII
From 04-DEC-21 00:59:00 to 06-DEC-21 03:24:00 (HST-10)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

An estimated 6 to 10 inches of snow fell, after about 2 inches of rain that fell and froze, over the summits of Mauna Kea and Mauna Loa on the Big Island of Hawaii.  Some snow drifts were 3 to 5 feet in depth.

Heavy Rain in HAWAII, HAWAII
From 03-DEC-21 18:09:00 to 03-DEC-21 22:38:00 (HST-10)
Location: HALAULA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in HAWAII, HAWAII
From 03-DEC-21 22:59:00 to 04-DEC-21 00:59:00 (HST-10)
Location: GLENWOOD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in MAUI, HAWAII
From 04-DEC-21 00:13:00 to 04-DEC-21 03:48:00 (HST-10)
Location: NAHIKU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in HAWAII, HAWAII
From 05-DEC-21 04:33:00 to 05-DEC-21 06:24:00 (HST-10)
Location: AKAKA FALLS ST PARK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy Rain in HAWAII, HAWAII
From 05-DEC-21 09:30:00 to 05-DEC-21 20:59:00 (HST-10)
Location: HILO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations