Extreme Heat Warnings Cover Parts of Oregon, Washington and California

M. m. CDT Saturday, where temperatures are expected to reach up to 105 degrees. Heat advisories are in place across southwest Oregon, including Jackson, Josephine, Curry and Douglas counties, where high temperatures will range from 94 to 104 degrees from Sunday to Tuesday.

In Washington, heat advisories cover western portions of the state, including the Seattle area, Puget Sound lowlands, Cascade foothills and parts of the Olympic Peninsula. Heat advisories are in effect across south-central Kansas, including Kingman, Harper, Sumner, Cowley and Barber counties, where heat index values are expected to reach up to 105 degrees.

Northern and northeastern Oklahoma, including areas such as Enid, Stillwater, Tulsa and Ponca City, are under a heat advisory, with heat index values between 105 and 108 degrees expected. A heat advisory covers the southern and eastern Piedmont, Sandhills and southern Coastal Plain in North Carolina, with heat index values of 102 to 108 degrees expected.

Another advisory covers areas such as Jacksonville and New Bern, where heat index values may reach up to 105 degrees.

Heat advisories are in place across coastal and northeastern portions of South Carolina, including Myrtle Beach and Florence, where heat index values are expected to reach 105 to 110 degrees. A heat advisory is in effect across central, east central, north central, northeast, southeast and west central Georgia, where heat index values are expected to reach up to 105 degrees.

The eastern Florida Panhandle and Big Bend region, including Tallahassee and Panama City, are under a heat advisory, with heat index values between 106 and 110 degrees expected.

The National Weather Service issues regular updates via its website and social media channels. The alerts come ahead of a UFC Freedom 250 event planned as part of celebrations marking the 250th anniversary of the Declaration of Independence and President Donald Trump's 80th birthday on Sunday.

The National Weather Service advises limiting outdoor activity, staying hydrated, taking shade breaks if outside, remaining in air-conditioned spaces as much as possible and checking on others.