Triple-digit temperatures are forecast throughout parts of Oregon and Washington, which includes the Interstate 5 corridor. Both Portland, Oregon, which could see the mercury crack the 110-degree mark, and Seattle, which is expected to top 100, could experience temperatures around 30 to 40 degrees above normal and challenge daily record highs.

Following a cooler stretch of weather, the dangerous heat is forecast to peak from Saturday through Monday as high pressure settles in and enables temperatures to climb to new heights.

"There are typically a few rounds of heat in the Pacific Northwest each summer, but this particular heat wave looks quite extreme," said AccuWeather Meteorologist Brian Thompson, who regularly analyzes weather patterns in the West.