NIIHAU; KAUAI SOUTHWEST; KAUAI MOUNTAINS; WAIAN… — A trough moving over the state should bring abundant tropical moisture and is expected to remain nearly stationary for a few days. Heavy rain and isolated thunderstorms are possible, potentially leading to flooding across all islands.
* WHAT...Flash flooding caused by excessive rainfall is possible.
* WHERE...All main Hawaiian Islands.
* WHEN...From Tuesday morning through late Wednesday night.
* IMPACTS...Flood prone roads and other low lying areas may be closed due to elevated runoff and overflowing streams. Urban areas may receive more significant flooding and property damage due to rapid runoff.
* ADDITIONAL DETAILS... - Heavy showers and isolated thunderstorms with intense rain rates may develop Tuesday and continue through Wednesday evening as a trough moves over the state.
Flooding in Niihau; Kauai Southwest; Kauai Mountains; Waianae Coast; Oahu North Shore; Olomana; Central Oahu; Waianae Mountains; Lanai Mauka; Kahoolawe; Maui Windward West; Maui Leeward West; Haleakala Summit; Kona; Kohala; Big Island Interior; Big Island Summit; Kauai North; Kauai East; Kauai South; East Honolulu; Honolulu Metro; Ewa Plain; Koolau Windward; Koolau Leeward; Molokai Windward; Molokai Southeast; Molokai North; Molokai West; Molokai Leeward South; Lanai Windward; Lanai Leeward; Lanai South; Maui Central Valley North; Maui Central Valley South; Windward Haleakala; Kipahulu; South Maui/Upcountry; South Haleakala; Big Island South; Big Island Southeast; Big Island East; Big Island North can cut off roads with little warning, damage homes near low-lying areas, and disrupt power and water service. Even a few inches of moving water can carry away a vehicle.
This report is based on information from NWS, monitored by Alert USA's verified emergency feed.
Alert USA anticipates a high chance of travel disruptions, elevated property risk in low-lying areas, and possible power outages while the event is active.
Recommended steps: avoid flooded roads — turn around, don't drown; move to higher ground if you are in a low-lying area; charge phones and prepare for power loss; check on family and neighbors.
Alert USA is tracking this flood event and will update this report as verified information becomes available.
Verified by Alert USA • NWS