A meeting of weather minds at the Oregon museum of Science and Industry dissected the Aumsville tornado. Tyree Wilde with the National Weather Service says tornadoes in December in Oregon are uncommon but not impossible. He adds that tornadoes in Oregon are very different than the rest of the country. They're usually generated from smaller storms, are hard to determine on radar and don't last very long. 147 tornadoes have been recorded throughout the State's history.