Even stronger storms are forecast for Saturday, with Seattle being a likely target.
The Coast Guard rescued 40 teenagers and six adults near Lake Crescent, Washington, USCG Petty Officer Ali Flockerzi told CNN.
The group was stranded at their camp without power and was blocked in by falling trees, Flockerzi said. The Coast Guard deployed a 29-foot rescue boat that holds seven passengers to take them to safety, Flockerzi said.
The National Weather Service confirmed two tornadoes touched down in the northwest Oregon coastal cities of Manzanita and Oceanside.
The tornadoes damaged 25-30 homes, Gordon McCraw with Tillamook County Emergency Management told CNN. Video and photos showed uprooted trees, toppled telephone poles and ruffled rooftops.
"Police are doing a great job keeping people safe after tornado," Manzanita resident Michael O'Loughlin tweeted.
First responders searched the Mazanita area but have not found anyone trapped under the debris, Tillamook County Sheriff Andy Long told CNN. Though a Red Cross shelter has been opened at a local church for anyone displaced, residents are urged to shelter in place because more storms are expected in the area, Long said.
The National Weather Service said the last time two tornadoes touched down the same day in NW Oregon was November 12, 1991, when three were reported.
The weather service's Portland office said it broke its record for the most tornado warnings in a day, issuing 10 on Friday..
More storms Saturday
The National Weather Service in Seattle said the Friday storms were part of a one-two punch.
The second storm, the stronger of the two, will pack the remnants of Typhoon Songda and strike the Pacific Northwest on Saturday with intense wind and rain.
There is growing consensus that the Saturday storm will move over Washington, according to the weather service.
If the storm crosses directly over or near western Washington, "this would be a worst-case scenario leading to a historical and destructive windstorm for the area," it warned earlier this week.
The winds from the second storm are likely to be fierce and widespread, according to CNN Weather.
"Coastal Washington, Oregon and the interior mountain ranges will feel the brunt of the strongest winds, possibly reaching hurricane strength (which is 74+ mph) by Saturday evening," said CNN Meteorologist Derek Van Dam.
"Damaging winds will still be possible across the Seattle metro region, but will experience gusts between 50 to 60 miles per hour."
Seattle began hunkering down for the double barrel of storms by shutting its parks, preparing emergency resources and opening more slots at its homeless shelters.
The possibility that the Saturday storm could be "one of the severest weather events that we've ever had has caused us to step up our response significantly," said Seattle Mayor Ed Murray in a news conference Thursday.
Rain pelted the northwest Thursday as the National Weather Service warned of high winds ranging from 30 to 70 mph. The winds on Thursday night reached 82 mph in Crystal Mountain and 48 mph in Hoquiam, Washington.
Saturday's storm is expected to drench the West Coast from Washington down to northern California. It could pose dangers including fallen trees, downed wires, power outages and floods.
The storms could produce high seas potentially reaching 30 feet or higher, and coastal flooding along areas of Washington, according to CNN Weather.
A third storm may pass through the Pacific Northwest next week, said CNN Meteorologist Dave Hennen.