Oregon Researchers: Tornadoes Here are Unusual

 
 
for Those Traveling to and from Oregon; Space Travel
     
 

Oregon Researchers: Tornadoes Here are Unusual

Published 12/14/2010

(Corvallis, Oregon) – A tornado that caused substantial damage in Aumsville late Tuesday morning likely was caused by unstable cold air slamming into the unseasonable warm, moist air mass that has lingered in the Willamette Valley for several days, climate experts say.

Tornadoes in Oregon are unusual, though not exactly rare. Most of them are mild in nature, so the damage caused by Tuesday’s twister caught many people by surprise.

“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.”

“Typically, to get a strong tornado, you need a heat source to provide ascent, cold air aloft, moisture and upper-level wind shear all at once,” she added, “and that’s what we got today.”

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.” The most recent listings came from fall of 2009, when small (EF0) tornadoes touched down near Lincoln City on Nov. 7, and near Oregon City on Oct. 26.

During the past 20 years, about 20 tornadoes have been logged by the National Weather Service and they were scattered around the state. Several were in the Willamette Valley, but others were along the coast, and still others in eastern Oregon.

These events are the results of atmospheric instability, Dello pointed out, and are not necessarily tied to either climate change or the La Niña winter.

“Oregon often switches from a warm front to a cold front, and vice versa,” Dello said, “but usually that transition is much more moderate. 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. That cold trough really kicked things off.”

 

 
     

Explore Oregon's Regions

 

Oregon Coast

Portland
Portland Restaurants, Dining

Columbia Gorge

Eastern Oregon

Yamhill Wine Country

Southern Oregon

Central Oregon

Willamette Valley

International, United States Travel, Attractions, Flight Deals

Travel News

OregonTravelDaily home

Contact OregonTravelDaily.com

Subscribe to this travel news feed in a reader

 
     

 

Latest Travel News

 


Oregon Wine Country Thanksgiving a Giant Feast for Senses
Three days of awesome wine get paired with killer scenery and fabulous food at the Oregon Wine Country Thanksgiving this week
Why Are There No Dinosaur Bones in Oregon? Surprising Science
You may be wondering why you never hear about dinosaur bones being found in Oregon. No T Rex. No Triceratops. Paleontology, Portland, Wine Country, Eastern Oregon, Cascades
Be Your Own Ragnar or Floki: Viking Tourism in N. America
It turns out, several sights in North America may have some Viking visitation remnants - although the sad news is only one is confirmed to be so. Canada, East Coast, Rhode Island, Minnesota, Massac...
Oregon Wine Country Lodging: A Most Delicious Bit of Travel Advice
For those venturing out to this lush and lovely land of vineyards, hills and wide open skies, here's a few suggestions on where to stay. Yamhill County, McMinnville, Newberg, Dayton, Carlton, Dunde...
Oregon Star Parties for Total Lunar Eclipse on April 15
Get ready for a pair of OMSI Star Parties of a spectacular sort where you'll get a distinctive view of a total lunar eclipse