At 4:30 p.m., Civil Defense reported that flash flooding was continuing with water flowing across Belt Highway 11 between mile markers 103 and 109 and that homes were flooded in Kealia. Although radar indicates that the downpours have subsided, runoff continues to be dangerously high,

Other locations in the warning include, but are not limited to, Kealakekua and Captain Cook.

Ample low-level moisture and a strong upper trough sweeping across the Islands will continue to provide the ingredients for heavy rain today and tonight, weather officials said.

The upper trough is expected to move east of the Islands late tonight, decreasing the threat of widespread heavy rain.

A flash flood watch means that conditions may develop that lead to flash flooding. A flash flood warning means flash flooding is imminent or occurring in streams, roads and low-lying areas.

Earlier today, the National Weather Service extended a flash flood warning for Kaua'i until 4 this afternoon.

Heavy rains continued to fall near Kalaheo, about 11 miles southwest of Lihu'e.

Incidents of flash flooding were occurring or appeared to be imminent in Kaua'i streams and low-lying areas, according to the Weather Service.

Earlier today, a thunderstorm with very heavy rain and frequent cloud-to-ground lightning moved across Kailua, Waimanalo and Makapu'u Point before moving off-shore at mid-morning.

Motorists were warned to look for ponding in low-lying and poor-drainage areas that makes driving hazardous.

Police have received reports of flooding on Makaloa Street and stoplight problems at the corner of Ke'eaumoku Street and Kapi'olani Boulevard, where the water is reported to be 18 inches deep.

There were also reports that Citron Street was inundated with rainwater between Hau'oli and Manalo streets.

Watch commuters make their way through flooded streets in this ADVERTISER VIDEO.

Firefighters from the Pawa'a station were sent to a home at 2135 Waiola St. in Makiki where a home was reported to be flooded at about 8:10 a.m.

Heavy overnight rains on Kaua'i have also resulted in the closure of Hanalei Elementary School.

Hawai'i Department of Education spokesman Greg Knudsen said the school itself is fine but heavy runoff has resulted in the flooding on the road at Hanalei Bridge, restricting access to the school.

Classes at the school are expected to resume tomorrow, barring continuing weather problems.