OREGON CITY, Ore. -- An Urban and Small Stream Flood Advisory was temporarily in effect in much of the southern Portland metro area as a thunderstorm rolled through Monday afternoon.
Interstate 5 at Nyberg Road saw some flooding conditions just before 3 p.m., but the water subsided shortly afterward.
Gladstone residents were warned to avoid contact with the Clackamas River for several days after the storm overtaxed the city's water systems and raw sewage was discharged into the river.
The Clackamas County Courthouse was temporarily closed when the thunderstorm caused a power outage just after 1:30 Monday afternoon.
Nearly 2,500 PGE customers were without power at the peak of the storm. Check the latest power outage numbers
In Oregon City, the sheriff's office announced that several streetlights were out and affected intersections should be treated like 4-way stops.
Traffic Signals out
99 and 14th
Washington Street at 14th and 15th
McLoughlin and South 2nd
Please treat these as 4 way stops— Oregon City Police (@OCPolice) October 17, 2016
Outages were also reported at the Oregon City School District headquarters and at Jackson School. But power was restored to both buildings and to the courthouse before 2 p.m.
Several viewers sent us pictures and videos of the storm as it moved into Sherwood, Lake Oswego and other areas. No injuries or widespread damage were reported.
Lake Oswego Fire shared video of a tree and wooden fence that were struck by lightning Monday afternoon.
Wild lightening hits tree and shoots bark plus fence boards into yard of Bryant Road. pic.twitter.com/uUeRQmLzcz— Lake Oswego Fire (@LakeOswegoFire) October 17, 2016
"All of the sudden I heard this boom and the next thing I do is look up and all this bark is flying towards my window of my office, and that's when I knew a tree had been hit," said homeowner Steve Aldrich.
Your Pics: Thunderstorm in Portland
Just some lightening in milwaukie....no big!! ;)Posted by Chrissy Tichenor Smith on Monday, October 17, 2016
Wild in Sherwood!Posted by Michele Green on Monday, October 17, 2016