A pre-weekend downpour caused rivers and streets to flood around the county Friday.

The rain is a result of a significant deep atmospheric river, said Doug Williams, King County Department of Natural Resources and Parks spokesperson.

“The massive plume of moisture is coming from beyond Hawaii and hitting us dead center,” Williams said.

The Tolt River began flooding at about 2:30 a.m. on Dec. 20. The Snoqualmie began flooding at 4:30 a.m. Both the Tolt and Snoqualmie rivers had reached moderate flood phase three by Friday afternoon, signifying moderate wide-spread flooding. Road closures typically occur in phase three.

“One of the things we saw a lot of today was folks driving through really deep standing water,” Williams said. “So, the number one message is always ‘Don’t drive around a road closed sign.’”

For county flood warnings and alerts visit kingcounty.gov/flood.