The Bay Area is experiencing its final day of extreme heat with temperatures reaching up to the low 100s in some regions, before a low-pressure trough brings significantly cooler weather by the weekend. Northern California, including Sacramento, continues to endure high temperatures, peaking at 109 degrees, with some relief expected by Thursday. Similarly, Central Florida and Utah are also facing extreme heat, with Central Florida seeing a heat index over 100 degrees and Utah experiencing triple-digit temperatures coupled with monsoonal thunderstorms and potential flash flooding. Smoke from wildfires is affecting air quality in multiple regions, with advisories in place for areas such as Idaho and Utah. Relief in the form of cooler temperatures is anticipated for most affected areas by the weekend, although some regions may see a return to warmer weather next week.