After nearly a full week of oppressive summerlike heat for the western United States, temperatures will finally ease back to normal levels this week.
As of Saturday, the sting of summerlike heat had already begun to fade for many coastal cities and areas immediately inland. Downtown Los Angeles, for example, reached a high temperature of 79 F on Saturday, full 10 degrees Fahrenheit lower than Friday’s high of 89.
However, heat refused to release its grip on cities farther inland, into the valleys and deserts of California, and portions of the Southwest where record heat continued.
The persistent upper-level atmospheric pattern that has locked summerlike heat into the West and record-breaking cold into the East will finally begin to break down on Sunday, allowing a storm system to develop off the coast of California.
This storm will advance toward the West Coast on Monday, ushering in some much-needed rainfall to Northern California and Oregon. Ahead of this system, wind direction over much of California will shift, which will allow temperatures across the region to regulate.
“As the offshore winds begin to subside, cooler conditions will return to much of California finally,” AccuWeather Meteorologist Courtney Spamer said.
During this heat wave, much of the state has been dominated by hot offshore flow. Winds will continue to shift across the region on Sunday and more of the West Coast will be placed under the influence of cooler onshore flow.
Some coastal locations have already experienced the temperature relief onshore flow can bring.
San Francisco received quite the temperature shock from Friday to Saturday when winds shifted. On Friday, under offshore winds, the city reached a high of 82. While under the influence of onshore winds on Saturday, the mercury was unable to surpass 66.
Conditions will begin to cool off in earnest for much of California on Sunday, with many locations recording temperatures 5-10 degrees lower than Saturday.
Coastal communities will remain in the 60s on Sunday, while areas just inland reach into the 70s. Valley locations will remain rather warm on Sunday with temperatures in the upper 80s to lower 90s expected. Desert locations will remain under triple-digit heat.
reference -AccuWeather
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