Flood Watch issued September 6 at 5:00PM HST until September 8 at 6:00PM HST by NWS Honolulu HI

Niihau; Kauai Southwest; Kauai Mountains; Kauai North; Kauai East; Kauai South

Urgency: Future

Certainty: Possible

Onset: 9/7/2026, 3:00:00 AM

Expires: 9/7/2026, 5:00:00 PM

Details

Moisture along the eastern flank of Hurricane Lowell will bring periods of heavy rain to the main Hawaiian Islands through Tuesday. * WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Kauai and Niihau. * WHEN...Through Tuesday afternoon. * IMPACTS...Significant flooding may occur due to the overflow of streams and drainages. Roads in several areas may be closed, along with property damage in urban or low lying spots due to runoff. Landslides may also occur in areas with steep terrain. * ADDITIONAL DETAILS... - Moisture along the eastern flank of Hurricane Lowell will bring periods of heavy rain to the main Hawaiian islands through Tuesday. Initially, the threat of heavy rain will be highest along windward and mountain areas, and then spread everywhere as the winds become more southerly by Monday.

What To Do

You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.

Other Active Flood Watch Alerts

Flood Watch issued September 7 at 6:01AM MDT until September 8 at 12:00PM MDT by NWS Great Falls MT

East Glacier Park Region; Northern High Plains; Eastern Glacier, Western Toole, and Central Pondera; Eastern Toole and Liberty; Southern Rocky Mountain Front; Southern High Plains; Eastern Pondera and Eastern Teton

Flood Watch issued September 7 at 3:59AM MDT until September 8 at 12:00PM MDT by NWS Missoula MT

West Glacier Region; Flathead/Mission Valleys; Potomac/Seeley Lake Region

Flood Watch issued September 6 at 5:00PM HST until September 8 at 6:00PM HST by NWS Honolulu HI

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; 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

Flood Watch issued September 6 at 9:51AM MDT until September 8 at 12:00PM MDT by NWS Missoula MT

West Glacier Region; Flathead/Mission Valleys; Potomac/Seeley Lake Region

Source: National Weather Service.