July 15: Dangerous heat returns with heat index up to 109 degrees

A Heat Advisory has been issued for Broward and Miami-Dade counties from 11 a.m. with heat index values reaching 109 degrees. Miami's high temperature is forecast at 94 degrees, potentially nearing or breaking the July 15 record of 96 degrees. Saharan dust is suppressing rain chances but will begin to dissipate by Friday, increasing the likelihood of showers and thunderstorms.