SAGINAW, Mich. (WNEM) - High heat continues today as we have one more First Alert Weather Day. This will be the last one of this week for this heat. The upcoming weekend for the Fourth will still be warm and humid though. More details below.

Tuesday through Monday are First Alert Weather Days as a heatwave settles into the Tri-State and makes outside conditions dangerous. The heat and humidity have brought dangerously hot heat index values to region,

Mayor Mary Sheffield signed an executive order directing city departments to address extreme weather related matters as Detroit experiences high heat.

HUNTSVILLE, Ala. ( WHNT) — Weather Authority Impact Days continue through Friday due to the combination of high heat and humidity in the area. A dangerously hot air mass will persist over the region.

As temperatures climb into the high 90s and approach triple digits, Mid-Ohio Valley health officials are urging residents to take heat exhaustion seriously and to recognize when symptoms may signal a medical emergency.

Temperatures are expected to remain in the mid-90s at Scioto Country Club, which is hosting the U.S. Senior Open. Fans attending the event should stay hydrated.

Our multi-day Yellow Alert continues on Thursday and Friday for even more heat and humidity, and an increasing chance for some storms. Starting with the heat: Thursday will be a near repeat of Wednesday,

An Extreme Heat Warning remains in effect through Wednesday night as a stubborn ridge of high pressure continues to pump hot, humid air into the region.

Parts of Ontario and Quebec will be well above normal temperatures this week as a heat wave spreads over North America.

With temps feeling like 100+ degrees and "tropical" humidity, fans need to prepare and hydrate.