One of the worst heat waves in Portland history burns on

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Squirrel Days of Summer: YouNews contributor gooutPDX sent KATU.com this snapshot of a squirrel trying to stay cool in the Northwest heatwave.

PORTLAND, Ore. - Here we go again.

KATU Meteorologist Rhonda Shelby is forecasting a high of 107 for Wednesday in Portland, which would tie the all-time high for the area and make it one of the hottest cities in the U.S. - second only to 109 in Phoenix. Residents have already suffered through highs of 103 on Monday and 106 on Tuesday.

Even if it does not reach 107 in Portland on Wednesday, the temperature will definitely surge past 100 again. And Shelby expects much of the same for Thursday.

"I think this is going to go on for four days in a row, which will go down in the record books as one of the most oppressive heat waves we've had in Portland," Shelby said. The other two were in 1994 and 1981, she said.

Cities along Interstate 5 in northwest Oregon and southwest Washington should also see the same 100-degree heat Wednesday, Shelby said. Even Astoria may hit 92.

Consider this: The average high temperature at this time of year is only 81.

To beat the heat, some people are checking in to local hotels to take advantage of the air conditioning. At the Courtyard by Marriott in downtown Portland, officials said they had at least eight guests walk in and book rooms just for the AC. For those without such means, there are plenty of cooling centers. SEE A LIST OF LOCATIONS NEAR YOU

So when is relief in sight? Shelby does not expect the Portland area to get out of the 90s until Sunday.