Western Washington is bracing for another sweltering day as a heat advisory remains in effect until 10 p.m. Tuesday. Meteorologist Ted Buehner warned that most of the region will experience unusually high temperatures, with Seattle approaching 90 degrees and the south sound extending into the 90s, while coastal areas and the Strait of Juan de Fuca remain slightly cooler.
Story Highlights
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Heat advisory in effect until 10 p.m. Tuesday for western Washington.
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Seattle highs near 90 degrees; Portland area well into the 90s.
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Record-breaking low of 69 degrees at SeaTac Sunday night.
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Authorities warn heat can be dangerous; precautions urged.
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Cooler Pacific air expected Tuesday night to ease temperatures.
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Bear Gulch wildfire smoke may briefly affect Puget Sound.
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Mid-week highs expected in the 70s; rain possible this weekend.
“The only areas that aren’t affected are basically out on the coast and up in the Strait of Juan de Fuca,” Buehner explained. “Temperatures are going to be getting close to 90 degrees in the Seattle area. As you get closer to the south sound and down toward Portland, now you’re getting well into the 90s.”
Record-Breaking Overnight Lows
Relief from the heat has been minimal, even during nighttime hours. Sunday night, the low at SeaTac only fell to 69 degrees, setting a record for the date. The previous record, 66 degrees, had stood since 1981.
Buehner noted, “The low temperature at SeaTac only got down to 69 (Sunday). That was the warmest low temperature on record for the date. The previous record was 66, set in 1981. And this coming night it’s probably going to be very similar.”
Heat Can Be Dangerous
Authorities are urging residents to remain cautious. Buehner described the extreme temperatures as a “silent killer” and reminded the public of the 2021 heat dome that struck the region.
“Remember back in June of 2021, we had the heat dome here,” he said. “Temperatures in Seattle reached triple digits for three days in a row, topping out at 108 degrees on June 28.”
The Washington State Department of Health reported 100 heat-related deaths during that period, from June 26 to July 2. Research led by a University of Washington professor also linked the extreme heat to multiple accidents, including drownings.
Even though temperatures this week are not expected to reach triple digits, Buehner emphasized precautionary measures:
“If you can find air conditioning for just a few hours, that really relieves the stress on your body,” he said. “Also, cut down on outdoor activities during the hottest part of the day and make sure to stay hydrated.”
Cooler Air on the Horizon
The heat is expected to subside Tuesday night as the hot air over western Washington moves east of the Cascades.
Buehner described the change: “We get a lovely — I call it nature’s air conditioning — with cooler air coming in from the Pacific Ocean.”
However, the onshore flow of cooler air may briefly carry smoke from the Bear Gulch wildfire near Lake Cushman into the Puget Sound area. “Some of that smoke will probably get over to the rest of the Puget Sound area, but it should come in and get out pretty quickly because we’ll start to see the marine clouds on Wednesday morning,” Buehner added.
Daytime temperatures are forecast to drop back into the 70s mid-week, offering welcome relief to residents. By the weekend, there is even a chance of rainfall, potentially providing more long-term respite from the heat.
Residents of the Puget Sound region are advised to stay vigilant as the heat persists through Tuesday. While the worst of the temperatures are expected to ease by Tuesday night, precautions such as staying hydrated, limiting outdoor activities, and seeking air-conditioned spaces remain essential. Cooler air moving in from the Pacific, along with potential rainfall later in the week, should provide relief, but awareness and caution remain key to safely navigating the ongoing heat advisory.
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