Just as it releases its 100-degree grip on the Northeast, the heat is rolling into the Pacific Northwest.

An excessive heat advisory has been issued for the entire region, effective from noon Tuesday through Friday evening. A high of around 90 degrees Fahrenheit is expected in Seattle on Tuesday and Wednesday, according to the National Weather Service.

In some parts of Washington, Oregon and Northern California, temperatures are forecast to creep even higher. In Enumclaw, for example, the high on Tuesday, Wednesday and Thursday is expected to be 94-95 degrees. Spokane could hit 105 degrees by the end of the week, according to the weather service, while in Oregon, Portland could reach 102 on Tuesday and Bend is expected to sizzle at 103 degrees on Thursday.

“To have five-day stretches or a weeklong stretch above 90 degrees is very, very rare for the Pacific Northwest,” said Vivek Shandas, professor of climate adaptation at Portland State University.

By Thursday and Friday, the local forecast drops to 89 and 88 degrees, respectively. By late Saturday and Sunday, we should be back down to 80 or 81.

Just as telling as the daily highs, however, are the expected overnight low temperatures, which, in the mid-60s, will be higher than our normal low of 58.

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Many homes here lack air conditioning, and indoor heat is likely to build through the week, increasing the risk of heat-related illnesses, said Lily Chapman, a New York-based National Weather Service meteorologist. For people without air conditioning, it may be too warm to sleep.

No matter how hot it gets this week, it’s is not going to be anything like last year, when temperatures driven by a heat dome hit record-breaking highs of 108 in Seattle and 116 in Portland.

In late June and early July 2021, about 800 people died across Oregon, Washington and British Columbia during the dayslong extreme heat event. Many of those who died were elderly and lived alone.

A person dives into the water from a pedestrian bridge at Lake Union Park into the water during a heat wave hitting the Pacific Northwest, Sunday, June 27, 2021, in Seattle. Yesterday set a record high for the day with more record highs expected today and Monday. (AP Photo/John Froschauer)

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Even though all-time-high records are unlikely, there is the potential for record-breaking daily temperatures. According to the weather service, Tuesday could set a new daily high record. The previous July 26 high was 92 degrees, reached in 2018.

In a heat bulletin, the city of Seattle said it’s opening numerous cooling centers and dispatching outreach teams to protect vulnerable residents from heat-related illness. The Central Library and 17 branches are air-conditioned; see the list at spl.org/today. Community centers that will be open 2-8 p.m. Tuesday through at least Thursday as cooling hubs include Rainier Beach, Chinatown International District, Northgate and Magnuson Park.

 In the bulletin, Mayor Bruce Harrell said, “We recognize the impacts of climate change and severe weather are not felt equally, which is why we must center equity and vulnerable neighbors in our response, now and in the long term,” Harrell said.

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The weather service recommends staying hydrated and staying out of the sun. Wear lightweight and loose-fitting clothing. Stay in an air-conditioned room if possible. Check on friends, family and neighbors. Children and pets should not be left unattended in vehicles under any circumstances, NWS said.

Take extra precautions if you work or spend time outside. If possible, reschedule strenuous activities for early morning or evening.

To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air-conditioned environments.

The scorching weather in the Pacific Northwest comes as the opposite side of the country got a bit of relief from a stretch of days where temperatures topped 100 degrees.

Philadelphia hit 99 degrees Sunday before even factoring in humidity. Newark, New Jersey’s five days at 100 degrees or higher was the longest such streak since record-keeping began in 1931. Boston also hit 100 degrees, surpassing the previous daily record high of 98 degrees set in 1933. At least two heat-related deaths have been reported.

While such high temperatures are sometimes seen in the Northeast, officials and residents in the Northwest have been scrambling to adjust to longer, hotter heat waves fueled by climate change.

Information from The Associated Press is included in this report.