NOHW40 PHFO 080231 PNSHFO HIZ001-003-004-006-007-009>011-015>018-022-023-026>054-090400- Public Information Statement National Weather Service Honolulu HI 430 PM HST Tue Dec 7 2021 ...KONA LOW DRENCHES THE STATE OF HAWAII... A strong kona low developed northwest of the main Hawaiian Islands and produced heavy rainfall over many areas of the state. The main rain band hit the Big Island first on Sunday, December 5, then shifted slowly westward across the island chain over the next two days. Rainfall totals were greatest over the southeastern flank of the Big Island, the south- and west-facing slopes of Haleakala, and most of Oahu, with the peak day of rainfall occurring on December 6. Flooding impacts on the Big Island were minimal on December 5, but increased on December 6 as rainfall increased in intensity and coverage. Several normally dry gulches in the Kau District flooded, and Highway 11 closed at Kawa Flats for a few hours. Persistent heavy rainfall initiated over Maui on the afternoon of December 5 as a north to south oriented rain band hit the slopes of Haleakala. Large flash floods filled the normally dry gulches west of Kaupo and closed Piilani Highway. Severe flooding also occurred in the Maui Meadows subdivision, causing damage to homes and washing away several vehicles. Roads in the Kula area were also closed due to flooding. On the afternoon and evening of December 6, thunderstorms with heavy rainfall moved over Oahu from the south, causing flooding in numerous locations across the south side of the island and especially in Honolulu. One notable impact was flooding damage to the Iwilei power substation which cut electrical service to Downtown Honolulu businesses and residents. On the windward side of Oahu, flooding closed Kamehameha Highway from Waiahole to Waikane. The following are selected rainfall totals for the 2-day period (48 hours) ending at midnight HST, Tuesday, December 7. All amounts are in inches. These totals are considered preliminary for information purposes only. Location 2-day total Kauai Omao 4.35 Kapahi 3.91 Lihue Airport 3.28 Oahu Nuuanu Upper 11.68 St. Stephens Seminary 11.65 Maunawili 11.46 Manoa Lyon Arboretum 11.34 Luluku 10.89 Moanalua 10.36 Waihee Pump 10.30 Ahuimanu Loop 9.83 Makua Range 9.60 Aloha Tower 8.46 Palisades 8.41 Honolulu Airport 8.36 Dillingham 8.31 Ewa Beach 8.00 Waianae 7.31 Maui County Kula 1 12.86 Puu Alii (Molokai) 8.58 Puu Kukui 7.06 Ulupalakua 6.95 Lanai 1 6.50 Kepuni 5.68 Lahainaluna 4.90 Kula Branch Station 4.31 Kahului Airport 3.39 Big Island Nene Cabin 14.26 Keaumo 13.42 Pali 2 11.32 Kulani NWR 11.13 Hilo Airport 5.52 Note that credible rainfall estimates from the Multi-Radar, Multi- Sensor (MRMS) system showed more than 20 inches of rainfall on Maui along the south-facing slope of Halekala over the Kahikinui Forest Reserve. $$ Kodama =========================================== NOHW40 PHFO 081921 PNSHFO HIZ001-003-004-006-007-009>011-015>018-022-023-026>054-100400- Public Information Statement National Weather Service Honolulu HI 915 AM HST Wed Dec 8 2021 ...KONA LOW DRENCHES THE STATE OF HAWAII... A strong kona low developed northwest of the main Hawaiian Islands and produced heavy rainfall over many areas of the state. The main rain band hit the Big Island first on Sunday, December 5, then shifted slowly westward across the island chain over the next two days. Rainfall totals were greatest over the southeastern flank of the Big Island, the south- and west-facing slopes of Haleakala, and most of Oahu, with the peak day of rainfall occurring on December 6. Flooding impacts on the Big Island were minimal on December 5, but increased on December 6 as rainfall increased in intensity and coverage. Several normally dry gulches in the Kau District flooded, and Highway 11 closed at Kawa Flats for a few hours. Persistent heavy rainfall initiated over Maui on the afternoon of December 5 as a north to south oriented rain band hit the slopes of Haleakala. Large flash floods filled the normally dry gulches west of Kaupo and closed Piilani Highway. Severe flooding also occurred in the Maui Meadows subdivision, causing damage to homes and washing away several vehicles. Roads in the Kula area were also closed due to flooding. On the afternoon and evening of December 6, thunderstorms with heavy rainfall moved over Oahu from the south, causing flooding in numerous locations across the south side of the island and especially from Pearl City to Honolulu. One notable impact was flooding damage to the Iwilei power substation which cut electrical service to Downtown Honolulu businesses and residents. On the windward side of Oahu, flooding closed Kamehameha Highway from Waiahole to Waikane. The island of Kauai managed to avoid significant flood impacts during the entire event. The following are selected rainfall totals for the 3-day period (72 hours) ending at midnight HST, Wednesday, December 8. All amounts are in inches. These totals are considered preliminary for information purposes only. Location 3-day total Kauai Omao 4.78 Kapahi 4.68 Lihue Airport 3.83 Oahu St. Stephens Seminary 12.83 Maunawili 12.61 Nuuanu Upper 12.45 Luluku 11.94 Manoa Lyon Arboretum 11.89 Waihee Pump 11.36 Moanalua 11.22 Makua Range 10.95 Ahuimanu Loop 10.86 Dillingham 10.12 Ewa Beach 9.57 Palisades 9.44 Aloha Tower 9.38 Honolulu Airport 9.28 Waianae 8.56 Maui County Kula 1 12.89 Puu Alii (Molokai) 9.28 Puu Kukui 7.25 Ulupalakua 6.98 Lanai 1 6.55 Kepuni 5.73 Lahainaluna 5.51 Kula Branch Station 4.58 Kahului Airport 3.48 Big Island Nene Cabin 14.26 Keaumo 13.42 Pali 2 11.64 Kulani NWR 11.15 Hilo Airport 5.77 Note that credible rainfall estimates from the Multi-Radar, Multi- Sensor (MRMS) system showed more than 20 inches of rainfall on Maui along the south-facing slope of Halekala over the Kahikinui Forest Reserve. $$ Kodama