Multiple US regions face extreme heat warnings and advisories

Extreme heat warnings and advisories have been issued across several U.S. regions, including Las Vegas, Nevada, and Phoenix, Arizona, where temperatures are forecast to reach 107-118°F and around 110°F, respectively, through August 21. A Heat Advisory is also active for parts of Louisiana and southeast Texas, with heat index values up to 110°F, and an Extreme Heat Warning is in effect for Jacksonville, Arkansas, with highs near 102°F. These conditions pose significant health risks.