Multiple areas across the country are expected to have dangerous heat and fire weather concerns this weekend with over 35 million Americans on alert for dangerous heat.

Extreme Heat Warnings remain in effect for Phoenix, Arizona, Palm Springs, California, and lower elevations of the Grand Canyon National Park. High temperatures there will once again be well into the 100s and go up to 115 in spots during the weekend.

Heat advisories are also in effect on Saturday for other scattered areas of the Southwest, with more widespread Heat Advisories stretching across the Plains as the heat begins to expand out.

Places under these heat advisories include: Albuquerque, New Mexico; El Paso and Dallas, Texas; Oklahoma City, Oklahoma; Little Rock, Arkansas; Wichita, Kansas; Springfield, Missouri; and Kansas City, Missouri.

High temperatures between 100 and 110 are possible for these areas on Saturday. Record high temperatures are possible for Albuquerque, New Mexico, and Flagstaff, Arizona, later Saturday.

The extreme heat peaked on Friday for parts of the Desert Southwest and is expected to ease this weekend.

There are also fire weather alerts in places across four states in the West — Oregon, Utah, Colorado and Wyoming — for critical fire weather conditions keeping a strong foothold into the weekend.

Single digit humidity and gusty winds are possible, which will be conducive for rapid fire spread with any new or existing wildfires in these areas.

While the extreme heat and the fire weather concerns are lingering for select parts of the Southwest this weekend, both will generally continue to wane into the beginning of next week.

Heat is also building up in the Northwest, where there’s an extreme heat warning in effect for Medford, Oregon, as well as from Eugene to Portland, Oregon.

High temperatures between 97 and 110 degrees are possible during the weekend into the beginning of next week. Very warm, low temperatures between 65 and 70 degrees are possible for these areas, providing little relief at night from the extreme heat.

Other areas of the Northwest are under heat advisories this weekend for high temperatures between 93 and 112, as well as low temperatures only getting into the 60s and 70s. These areas include Spokane, Washington; Lewiston, Idaho; Longview, Washington; and Mount Shasta, California.

Next week, widespread heat will return to the Northeast and much of the country.