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Even as it continues to swelter, the South may get a break from steamy weather this week while the Northwest bakes in some of the highest temperatures people there will endure all summer.
Tuesday looks to be similar to the extreme temperatures seen on Monday in places like Portland, Ore., which reached a new August record of 108 degrees. It isn’t unusual to get a day or two of 100-degree heat there, but three days in a row this late in the season is uncommon, said Clinton Rockey, a forecaster with the National Weather Service in Portland.
According to Mr. Rockey, only about 40 percent of the people in northwestern Oregon have air-conditioning, which can be troublesome, especially when the low temperatures at night are expected to also break daily records for heat.
The duration of this heat wave, which began on Sunday, and the high overnight temperatures are also a big concern for Matthew Cullen, a Seattle-based forecaster with the Weather Service who said there have been only a few hot days in his region this summer and no significant stretches of heat like this one, which could last at least until Thursday.
Temperatures will remain above average through Thursday, with excessive heat warnings lasting through Wednesday.
While the heat is dangerous, Mr. Cullen doesn’t expect this to be anything like the heat wave of June 2021.
In the South: Only mild relief.
Looking south, the heat index shows some brief relief expected across the region on Tuesday and Wednesday. In the early hours of Tuesday morning, the temperature in Dallas fell below 80 degrees for the first time in 15 days, ending an all-time record for the longest consecutive time above that temperature.
But on Thursday, the heat index will return to dangerous and near record levels. (Look up the heat index forecast in your city or town.)
Background: The dog days continue.
Just like in Dallas, the dip to more seasonable high temperatures of the 80s and 90s expected midweek will be short lived.
Temperatures will ramp up again, first in the Central Plains, then the Midwest and into the South late this week, reminding people in those regions that summer isn’t over yet.
Monday and Tuesday will be the hottest and the peak of this Northwest heat wave as the intensity will slowly decrease each day, returning to normal August conditions on Friday.
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