UPDATE: Tuesday, 6:45 a.m.

The flash flood warning for the island of Kauai expired at 8 p.m. Monday, but a flash flood watch continues for the island.

National Weather Service officials said an unstable air mass combined with daytime heating and enhanced sea breezes could spawn locally heavy showers and, potentially, flash flooding for the island today.

The flash flood watch is in effect through this afternoon.

Flood-prone roads and other low-lying areas may be closed due to elevated runoff and overflowing streams.

5:30 p.m.

A flash flood warning for Kauai has returned.

At 4:56 p.m., the river gauge at the Hanalei Bridge was at a dangerous level according to the National Weather Service.

The warning is in effect until 8 p.m.

1 p.m.

The flash flood warning for the island of Kauai was canceled shortly before noon. However, a flash flood watch has replaced it and is in effect through 8 p.m. today.

“An unstable air mass will remain over the island through this evening,” the National Weather Service said in a bulletin.

“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 areas due to runoff. Landslides may occur in areas with steep terrain.”

11 a.m.

Kuhio Highway near Hanalei Bridge is closed due to flooding, according to the Hawaii Department of Transportation.

PREVIOUS COVERAGE:

The National Weather Service has issued a flash flood warning this morning for Kauai County.

The warning is in effect until noon today.

Forecasters say the Hanalei river gauge shows the river level rising at a rapid rate while heavy rainfall continues in the mountains as of 8:55 a.m.

Flash flooding is expected to impact the following areas: Princeville, Kilauea, Hanalei, Wainiha, Haena, Moloaa, Wailua Homesteads, Alakai Swamp Trails, Anahola, Wailua, Na Pali State Park, Kokee State Park, Kalihiwai and Kealia.

The weather service warns the public to stay away from streams, rivers, drainage ditches and culverts.

Do not attempt to cross fast-flowing or rising waters in your vehicle or on foot.

The flash flood warning may be extended beyond noon if flooding persists.