PORTLAND -- Two back-to-back weather systems will bring heavy rain to the Portland metro area with little relief until Thursday night.

There won't be much of a break because by about 4 p.m. Wednesday the second wave of heavy rain will move in. Combined from both systems, we should see about 1 to 2 inches of rain for the valley, 1 to 3 inches for the coast and up to 4 inches for the Oregon Cascades, explained KGW Meteorologist Nick Allard.

KGWforecast / Doppler radar / 7-day outlook

He predicted that on Thursday, the rain will continue for the morning hours and then taper off to showers by midday.

We may see some isolated thunderstorms in the afternoon. Then on Friday we should actually dry out and stay mainly dry until Saturday night, with rain Sunday, Allard said.

The Oregon Department of Transportation sent out an alert warning drivers and bicyclists of standing water on roadways and an increased threat of slides. Reduced traction between tires and the road, along with reduced visibility, can make driving less predictable, the alert read.

The storms will bring a combination of rain and snow to higher elevations.

The Cascades will see heavy rainfall as the snow level rises to 7,000 feet. Snow showers will return Thursday as the snow level drops to 4,000 feet, he added.

A Special Weather Statement from the National Weather Service also warned that there could be flooding in area streams and rivers by Thursday.

As for the Oregon Coast, a High Wind Warning will begin at 2 p.m. for the Newport area and at 5 p.m. for Astoria. Allard said gusts could reach 60 to 70 mph.

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