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Yes, there are tornadoes in Oregon

National Weather Service photo of December 14, 2010, tornado damage in Aumsville, Ore.

EUGENE, Ore. - The tornado that tore through rural farmland in Oregon on Tuesday was more powerfully than initially rated by field observers.

The tornado cut a 500-foot wide, 1-mile long path through Lacomb, Oregon, just after 1 p.m.

The National Weather Service said staff visited the site for a second time and revised the rating for the tornado from an EF-O to a more powerful EF-1.

The tornado damaged 5 farm buildings and tore limbs off trees.

The Weather Service estimated the tornado delivered wind speeds up to 105 mph.

Tornadoes are rare but not unheard of in Oregon.

Last October, a waterspout off the Oregon Coast came ashore as a tornado, causing widespread damage in Manzanita, Oregon.

And a tornado marched down Main Street in Aumsville in 2010, causing widespread damage.

The National Weather Service maintains a web page listing major tornadoes in Oregon. The list has dozens and dozens of entries.

Among them is the tornado that makes the Portland office's Top 10 list of Oregon weather disasters: a tornado that cut a 10-mile long, 2-mile wide path through Wallowa County in northeastern Oregon back on June 11, 1968.

"This storm struck in very mountainous, uninhabited timbered area. Very few persons witnessed the tornado, and those persons were in poor position to actually observed the tornado," according to the National Weather Service. "Determination as a tornado is based largely on width of the path and appearance of wreckage it caused. Approximately 1,800 acres of prime timber were destroyed, with an additional 1,200 acres badly damaged. An estimated 40 million board feet of lumber were blown down. The storm lasted no more than 5 minutes at any observed point and was accompanied briefly by golfball-sized hail."

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