Tornadoes in Oregon are unusual, though not exactly rare. “Oregon’s moderate climate and topography are not conducive to frequent powerful tornadoes,” explained Kathie Dello, a research scientist with the Oregon Climate Service at Oregon State University. “The Pacific Ocean moderates the climate and the Coast Range protects us.”
A tornado ripped through Aumsville, Oregon just before noon today. A tornado warning was in effect for Marion and Clackamas Counties until about 12:30PM. The National Weather Service lists recent tornadoes in Oregon, including a December 2008, F2 tornado near Newberg described as “the most powerful tornado in Oregon in many years.” We had a lot of warm, moist air that had settled in the valley beneath a cold pool of air aloft, and a very strong low-pressure system that created a wind shear. Aumsville Oregon.