A persistent heat wave is expected to grip much of the northern U.S. through the weekend, bringing triple-digit temperatures and potentially dangerous weather conditions.

Temperatures in parts of central California spiked to more than 100 degrees in the days following Memorial Day and Excessive Heat Warnings and Watches and Heat Advisories were issued in the state by the National Weather Service (NWS). 

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Unusually high temperatures broke records in cities like Redding, Calif., and parched already dry landscape. 

Other western states – also impacted by historic drought – also felt scorching temperatures. 

In this May 26, 2020, file photo, people congregate on Robert W. Crown Memorial State Beach with the San Francisco skyline as a backdrop in Alameda, Calif. Officials are urging residents to stay hydrated and find shade as temperatures soar across much of central and northern California. Over 9 million people are under a heat advisory or excessive heat warning. With the soaring temperatures comes an increased risk of wildfires in the state where vegetation is extremely dry after a winter and spring with relatively little rain and snow. California's power grid operator says it's not anticipating outages during the heat wave. (AP Photo/Ben Margot, File)

In this May 26, 2020, file photo, people congregate on Robert W. Crown Memorial State Beach with the San Francisco skyline as a backdrop in Alameda, Calif. Officials are urging residents to stay hydrated and find shade as temperatures soar across much of central and northern California. Over 9 million people are under a heat advisory or excessive heat warning. With the soaring temperatures comes an increased risk of wildfires in the state where vegetation is extremely dry after a winter and spring with relatively little rain and snow. California's power grid operator says it's not anticipating outages during the heat wave. (AP Photo/Ben Margot, File)

Firefighters battled Oregon's Sycan River Fire, announcing that the more than 600-acre blaze was now 30% contained

Spokane, Wash., officials said that they would reopen the city's 17 "splash pads" to help kids beat the heat.

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To the south, Las Vegas temperatures were also predicted to either tie or break previous record highs

Nevada's city of Laughlin opened two centers for tourists off the Colorado River; temperatures there could reach as high as 112 degrees Fahrenheit. 

Temperatures in Arizona also spiked, with the state's capital of Phoenix hitting 105 degrees for the first time this year.

The NWS warned Thursday that the West would have to endure a few more days before the heat shifts into the northern-tier states.

However, the agency noted that a strong upper-level ridge responsible for blistering conditions would weaken and move into the Northern Plains and Upper Midwest

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Cooler temperatures from a cold front will sweep the Pacific Northwest by the weekend, and the frontal boundary could lead to scattered thunderstorms throughout the Northwest Great Basin and northern High Plains.

Nevertheless, fire officials have reminded residents to be wary of heat-related illness and keep hydrated.