Radar images and rain gauges show moderate to heavy rainfall over the windward slopes of the Koolau Range. The rain has remained stationary for several hours, forecasters at the weather service said.

Locations hard hit by the rain include, but are not limited to, Waimanalo, Olomana, Maunawili and Kane'ohe.

Residents are urged to stay away from streams and low-lying areas.

Don't try to cross fast flowing or rising water in your vehicle or on foot.

The water might be too deep to cross safely.

The flood advisory, which was issued at 5:50 a.m., is in effect through 9 a.m. and may be extended if necessary.

Here's how the next several days are shaping up:

Today, partly cloudy. Scattered showers in the morning, then isolated showers in the afternoon. Highs 76 to 85. East winds 10 to 15 mph. Chance of rain 50 percent.

Tonight, partly cloudy with isolated showers. Lows 64 to 72. Northeast winds10 to 15 mph. Chance of rain 20 percent.

Wednesday, mostly cloudy with isolated showers. Highs 78 to 84. East winds 10 to 15 mph. Chance of rain 20 percent.

Wednesday night, partly cloudy with scattered showers. Lows 65 to 70. Northeast winds around 10 mph. Chance of rain 40 percent.

Thursday, partly cloudy with scattered showers. Highs 78 to 84. South winds 10 to 15 mph. Chance of rain 50 percent.