PORTLAND, Ore. ( KOIN ) — Record-breaking, triple-digit temperatures are in the forecast as the National Weather Service issues an excessive heat warning, with the spike expected to start the Fourth of July — but just how long will this pattern of hot weather last?
Unfortunately, the summer heat isn’t expected to cool down any time soon.
KOIN 6 Meteorologist Josh Cozart says an “omega blocking pattern” is the reason behind the extended hot forecast, which is taking shape over much of the western half of the U.S.
“This type of setup blocks any cooler air from moving into the Pacific Northwest,” he says. “This blocking pattern will last through much of the next week.”
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Furthermore, even though temperatures are expected to cool by the middle of next week, it will still be warmer than average for this time of year by about 10 to 15 degrees, Cozart says.
Overnight hours aren’t expected to see much relief from this heat wave, with early morning lows forecasted to be just slightly below 70 along much of the Willamette Valley.