Surface low pressure with an associated frontal system developed to the west of the state, along with an upper level trough to the northwest, drawing an area of deep tropical moisture up from the south. This setup resulted in intermittent rounds of heavy rain and isolated thunderstorms over a 6-day period. The heaviest rain fell on the 7th into the 8th for the Big Island under pre-frontal southeast flow, then Kauai, Oahu, and Maui County from the 9th into the 11th as the dissipating front moved eastward down the island chain, washing out around the Big Island on the 11th. Another shortwave rotated through the upper trough the night of the 11th into the 12th, tapping into lingering moisture to bring another round of heavy rain and thunderstorms to portions of the western and central islands. The heavy rain resulted in several road closures due to flooding and land/rock slides, mainly on Kauai, Oahu, and southeast Big Island.
The following map shows radar-estimated rainfall from 6 am Tuesday April 7 through 6 am Monday April 14, 2026.
The following are preliminary rainfall measurements from 6 am Tuesday April 7 through 6 am Monday April 14, 2026.
Island of Kauai Inches Mount Waialeale (USGS) 18.33 Mohihi Crossing (USGS) 12.57 Waiakoali (USGS) 12.34 Waialae (USGS) 12.20 Puu Lua (RAWS) 12.19 N Wailua Ditch (USGS) 10.52 Waiahi Rain Gage (USGS) 9.31 Kilohana (USGS) 9.28 Makaha Ridge (RAWS) 9.18 Puu Opae (RAWS) 8.58 Kalaheo (12008) 7.58 Hanapepe (12002) 7.42 Waimea Tank (12007) 7.10 Hanamaulu (UHM) 6.98 Wailua (12005) 6.82 Omao (12004) 6.74 Kapahi (12003) 6.44 Port Allen (HSOIS) 6.38 Waimea Heights (RAWS) 6.17 Lawai NTBG (UHM) 6.08 Lihue Var. Stn. (12006) 5.52 Moloaa Dairy (RAWS) 5.42 Poipu (HSOIS) 4.91 Lower Limahuli (UHM) 4.81 Wainiha (12010) 4.71 Lihue Airport (ASOS) 4.50 Common Ground (UHM) 4.31 Anahola (12001) 4.16 Island of Oahu Inches Kaala (UHM) 9.00 Kuaokala (RAWS) 8.98 Mililani (3040) 7.58 Schofield Barracks (RAWS) 6.87 Maunawili (13008) 6.74 Palisades (3020) 6.45 Kunia Substation (3030) 6.44 Schofield East (RAWS) 6.39 Hawaii Kai Golf Crse (13015) 6.38 Kamananui Stream (USGS) 6.36 Pupukea Road (USGS) 6.28 Palehua (RAWS) 6.25 Makaha Stream (USGS) 6.13 St. Stephens (13006) 6.12 Kalahee Ridge (UHM) 5.96 Kaluanui (UHM) 5.89 Dillingham (RAWS) 5.81 Kahuku Training Area (RAWS) 5.33 Oahu Forest NWR (USFWS) 5.28 Waianae Valley (RAWS) 5.26 Hakipuu Mauka (13004) 5.13 Luluku (13016) 5.09 Kahana (USGS) 4.94 Punaluu Stream (USGS) 4.93 Niu Valley (13001) 4.92 Waihee Pump (13002) 4.79 Tunnel RG (USGS) 4.76 Olomana Fire Station (13009) 4.73 Kii (RAWS) 4.68 Bellows AFS (HSOIS) 4.54 Makua Range (RAWS) 4.50 Heeia NERR (NOAA/NOS) 4.32 Waiahole (USGS) 4.23 Kalawahine (UHM) 4.20 Lyon (UHM) 4.12 Island of Molokai Inches Puu Alii (RAWS) 6.66 Honolimaloo (UHM) 6.40 Island of Lanai Inches Lanai City (14012) 4.71 Island of Maui Inches Hana Airport (HSOIS) 15.48 Summit (UHM) 6.00 Kula 1 (RAWS) 5.60 Hanaula (UHM) 5.47 Puu Kukui (USGS) 5.36 Kahakuloa (14002) 4.67 Ulupalakua (14003) 4.46 Na Kula 4.05 Island of Hawaii Inches Kealakomo (RAWS) 18.68 Pali 2 (RAWS) 15.95 Pahoa (15015) 13.77 Pahoa (UHM) 11.38 Kapapala (RAWS) 10.77 Pahala (15004) 10.64 Kapapala Ranch (15003) 9.24 Nahuku (UHM) 7.62 Kaiholena (UHM) 6.80 Keahuolu (UHM) 5.42 Nene Cabin (RAWS) 5.36 Mountain View (15014) 5.33 Keaumo (RAWS) 5.24 Puu Waawaa (UHM) 5.16 Glenwood (15013) 4.52 Papaikou Well (5070) 4.45
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