National Weather Service radar image shows activity over Kona.

KONA – The National Weather Service has issued a Flood Advisory for Hawaii County, as radar showed moderate to heavy rain over the slopes of the North Kona district and along the slopes of Mauna Kea and Mauna Loa near Pohakuloa.

“The rainfall was affecting Highway 190…Or the mamalahoa highway… West of Puuanahulu.” said the NWS statement, posted at 1:06 p.m. Friday. “The area of heavy rain was nearly stationary and should persist for several hours. Additional heavy rain may develop over the South Kona district.”

Other locations in the advisory include but are not limited to Waikoloa, Waikii, Saddle Road, Kainaliu, Kealakekua and Honaunau.

The National Weather Service warns residents and visitors to stay away from streams, drainage ditches and low lying areas prone to flooding. “Rainfall and runoff will also cause hazardous driving conditions due to ponding, reduced visibility and poor braking action,” forecasters said.

The Flood Advisory is in effect until 4 p.m. HST but may need to be extended.

A Flash Flood Watch is also in effect for Hawaii County through 6 a.m. HST on Saturday.