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New study finds 'nighttime heat waves' increasing in Pacific Northwest
Date:7/22/2013

say the Midwest, people there would laugh at the concept of a Pacific Northwest heat wave," Dello said. "However, people in the Midwest are acclimated to the heat while in the Northwest, they are not. People in other regions of the country may also be more likely to have air conditioning in their homes.

On occasion, daytime and nighttime heat waves coincide, Dello said, as happened in 2009 when temperatures in the Pacific Northwest set all-time records in Washington (including 103 degrees at SeaTac), and temperatures in Oregon surpassed 105 degrees in Portland, Eugene, Corvallis and Medford. It was the second most-intense daytime heat wave in the last century, but lasted only three days by the 1 percentile definition.

However, that same stretch of hot weather in 2009 results in a nighttime heat wave that extended eight days, by far the longest stretch since records were kept beginning in 1901.

The latest nighttime heat wave began in late June of this year, and continued into early July, Dello said.

"Like many nighttime heat waves, a large high-pressure ridge settled in over the Northwest, while at the same time, some monsoonal moisture was coming up from the Southwest," she pointed out. "The high swept around and grabbed enough moisture to elevate the humidity and trap the warm air at night."


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Contact: Kathie Dello
kdello@coas.oregonstate.edu
541-737-8927
Oregon State University
Source:Eurekalert

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