PORTLAND, Ore. — The first of a series of powerful storms dumped heavy rain and swelled rivers in the Pacific Northwest on Tuesday, closing roads and prompting high water rescues.

Residents in parts of Oregon and Washington grappled with power outages, flooding and school closures, while drivers navigated debris slides and water that closed roads and submerged vehicles.

Fire officials northeast of Seattle said crews conducted several rescues, using inflatable kayaks to pull people from stranded cars and carrying another person about a mile (1.6 km) to safety after they were trapped in a wooded area by rising water.

Forecasters warned that the worst was still to come, with some major rivers expected to crest later in the week.

“We're starting to see a lot of rivers begin to rise and mov

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