HONOLULU (HawaiiNewsNow) - UPDATE 5:40 a.m. MONDAY:
A Flash Flood Watch for Kauai and Niihau has been extended until 6 p.m. on Monday. The National Weather Service predicts locally heavy rain and a slight chance of thunderstorms.
UPDATE 12:45 p.m. SUNDAY:
The Flood Advisory for Kauai has been cancelled. Radar and rain gauges show that the heavy rains have ended.
A Flash Flood Watch remains in effect for Kauai and Niihau until 6 a.m. Monday.
UPDATE 10:15 a.m. SUNDAY:
The National Weather Service has placed the entire island of Kauai under a Flood Advisory until 12:45 p.m.
Forecasters said at 9:42 a.m., radar indicated an extensive area of rain affecting the Garden Isle with a steady stream of rain clouds moving in from the southwest.
Kauai Civil Defense officials also reporting heavy ponding and debris on roadways due to the heavy rain.
The flood advisory means persons should stay away from streams, drainage ditches and low-lying areas that are prone to flooding. Heavy rainfall could also make driving hazardous due to reduced visibility, roadway ponding and poor braking.
The advisory may be extended if the heavy rain persists.
Kauai and Niihau also are now under a Flash Flood Watch until 6 a.m. Monday.
UPDATE 9:45 a.m. SUNDAY:
The Flash Flood Warning for Kauai has been allowed to expire after radar and rain gauges showed that heavy rain had ended.
Meanwhile, at last check, Weliweli Road in Koloa was closed at the Ala Kinoiki junction due to flooding. Kuhio Highway near the Hanalei Bridge was still open.
While the warning has expired, a Flash Flood Watch will go into effect at noon for Kauai and Niihau because of the continued threat of heavy rain.
UPDATE 6:50 a.m. SUNDAY: FLASH FLOOD WARNING
A flash flood warning has been issued for Kauai.
The National Weather Service says a rain gauge in the Kapaa area shows that rain is falling at a rate of approximately 2 inches an hour, and that the Hanalei River is rising rapidly.
Graphs from the National Weather Service's website that measure the height of the Hanalei River show the river gauge is now above seven feet and is dangerously close to the Flood Alert threshold of 7.75 feet.
Clouds, showers and the chance of heavy rain are in the forecast for the Presidents' Day holiday weekend, especially for the western half of the state.
In preparation, the National Weather Service has issued a Flash Flood Watch for Kauai and Niihau from noon Sunday until 6 a.m. Monday.
Showers from a lingering frontal cloud band will keep Saturday's weather on the damp side, especially for windward areas of mainly Kauai and Oahu. Skies will generally be mostly cloudy to overcast.
Forecasters expect a Kona low to form west of the state, bringing the threat of heavy rain Sunday or Sunday night through Tuesday. The threat is highest again for Kauai and Oahu. Winds will become more southerly as the disturbance deepens, drawing up moisture from the tropics toward the islands.
Forecasters are expecting the disturbance to weaken and start moving away Monday night.