• Evacuees prepare to board a U.S. Army Chinook on Tuesday, April 17, 2018 in Wainiha, Kauai. Hundreds of people have been airlifted out of dangerous floodwaters on the Hawaiian island of Kauai, but authorities said Tuesday that others are still stranded at evacuation centers. (Jamm Aquino/Honolulu Star-Advertiser via AP) Photo: Jamm Aquino, AP / © Honolulu Star-Advertiser 2018. All rights reserved.
Photo: Jamm Aquino, AP
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Evacuees prepare to board a U.S. Army Chinook on Tuesday, April 17, 2018 in Wainiha, Kauai. Hundreds of people have been airlifted out of dangerous floodwaters on the Hawaiian island of Kauai, but authorities said Tuesday that others are still stranded at evacuation centers. (Jamm Aquino/Honolulu Star-Advertiser via AP) less
Evacuees prepare to board a U.S. Army Chinook on Tuesday, April 17, 2018 in Wainiha, Kauai. Hundreds of people have been airlifted out of dangerous floodwaters on the Hawaiian island of Kauai, but authorities ... more
Photo: Jamm Aquino, AP
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Water and supplies are seen aboard a U.S. Army CH-47 Tuesday, April 17, 2018 in Princeville, Kauai. Rescue and relief operations commenced in the morning from Princeville Airport for people still stranded in Haena, Wainiha, and other parts of north Kauai. (Jamm Aquino/Honolulu Star-Advertiser via AP) less
Water and supplies are seen aboard a U.S. Army CH-47 Tuesday, April 17, 2018 in Princeville, Kauai. Rescue and relief operations commenced in the morning from Princeville Airport for people still stranded in ... more
Photo: Jamm Aquino, AP
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U.S. Army and emergency personnel unload water and supplies from a U.S. Army Chinook Tuesday, April 17, 2018 in Wainiha, Kauai. Hundreds of people have been airlifted out of dangerous floodwaters on the Hawaiian island of Kauai, but authorities said Tuesday that others are still stranded at evacuation centers. (Jamm Aquino/Honolulu Star-Advertiser via AP) less
U.S. Army and emergency personnel unload water and supplies from a U.S. Army Chinook Tuesday, April 17, 2018 in Wainiha, Kauai. Hundreds of people have been airlifted out of dangerous floodwaters on the ... more
Photo: Jamm Aquino, AP
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Haena resident Beaux Birch, left, hugs friends Diana Penchoff, right, before evacuation on a U.S. Army Chinook on Tuesday, April 17, 2018 in Haena, Kauai. Hundreds of people have been airlifted out of dangerous floodwaters on the Hawaiian island of Kauai, but authorities said Tuesday that others are still stranded at evacuation centers. (Jamm Aquino/Honolulu Star-Advertiser via AP) less
Haena resident Beaux Birch, left, hugs friends Diana Penchoff, right, before evacuation on a U.S. Army Chinook on Tuesday, April 17, 2018 in Haena, Kauai. Hundreds of people have been airlifted out of dangerous ... more
Photo: Jamm Aquino, AP
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A U.S. Army Chinook departs as evacuees queue in line Tuesday, April 17, 2018 in Haena, Kauai. Hundreds of people have been airlifted out of dangerous floodwaters on the Hawaiian island of Kauai, but authorities said Tuesday that others are still stranded at evacuation centers. (Jamm Aquino/Honolulu Star-Advertiser via AP) less
A U.S. Army Chinook departs as evacuees queue in line Tuesday, April 17, 2018 in Haena, Kauai. Hundreds of people have been airlifted out of dangerous floodwaters on the Hawaiian island of Kauai, but ... more
Photo: Jamm Aquino, AP
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Gregg Fraser, owner of Opakapaka Bar and Grille, points to a spot where floodwater ravaged the pavement and lifeguard station at Ke'e Beach Tuesday, April 17, 2018 in Haena, Kauai. Hundreds of people have been airlifted out of dangerous floodwaters on the Hawaiian island of Kauai, but authorities said Tuesday that others are still stranded at evacuation centers. (Jamm Aquino/Honolulu Star-Advertiser via AP) less
Gregg Fraser, owner of Opakapaka Bar and Grille, points to a spot where floodwater ravaged the pavement and lifeguard station at Ke'e Beach Tuesday, April 17, 2018 in Haena, Kauai. Hundreds of people have been ... more
Photo: Jamm Aquino, AP
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HONOLULU (AP) — Kauai residents struggling with the aftermath of torrential rains are bracing for the possibility of more flooding.

The National Weather Service says a flash flood watch is in effect for the Hawaiian island starting Thursday.

Mayor Bernard Carvalho says officials will be keeping a close eye on the weather.

At least 2 feet (71 centimeters) of rain dumped on Hanalei on Kauai's north shore during a 24-hour period over the weekend. The rain left people stranded in a shelter that became surrounded by water, homes damaged or washed off foundations and landslides along roadways.

Since Monday, military and county emergency workers have airlifted more than 340 people from the isolated north shore towns of Haena and Wainiha. Evacuations are ongoing.

Hawaii Gov. David Ige on Sunday declared Kauai a disaster.