Next week an enormous heat dome may swell over the country
The city of Portland could easily be hotter if a phenomenon called “downsloping” were occurring. That would involve air subsiding down the Cascades before going through what’s called “adiabatic compression” as the air heats up and dries out.
Instead, a “thermal low,” or a strip of low pressure induced by hot, rising air, is straddling the Cascades. That prevents downsloping but also fends off a cooling sea breeze. The result? Portland is caught in between a cooling influence and a heating effect, sitting right on the fence at about 100 degrees.Farther inland, temperatures are even hotter — Kennewick, Wash., could be near 111 degrees on Friday, Saturday and Sunday. Temperatures will settle back to around the century mark by Monday.
In the northern reaches of California’s San Joaquin Valley, highs will peak around 115 degrees in spots. Heat alerts also spread into the Great Basin of Nevada, the Columbia River Basin and Idaho.in interior parts of Northern California, Oregon and Washington saw record highs of 100 to 115 degrees, including Medford, Ore. , Redding, Calif. , and Yakima, Wash. .parked in the extreme northeast Pacific and adjacent western British Columbia.
The heat will begin to build markedly toward the middle of next week. Highs between 100 to 105 degrees will spread over Texas, Oklahoma, Kansas, Nebraska and Iowa on Wednesday; that could include Dallas, Fort Worth, Austin, San Antonio, Oklahoma City, Tulsa, Wichita, Kansas City, Omaha and Des Moines.
Upper 90s are more likely in the Upper Midwest, including Chicago, and throughout the Mississippi River Valley. On the East Coast, lower to mid-90s could reach all the way to the Mason-Dixon Line.
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