4Warn Weather – A 4Warn Weather Alert remains in effect through Wednesday as Southeast Michigan faces a one-two punch of dangerous heat and deteriorating air quality.
Heat Advisory and Air Quality Alert
A Heat Advisory remains in effect until 8 p.m. Wednesday, with afternoon temperatures climbing into the mid- to upper 90s and heat index values reaching 100 to 106 degrees. By Wednesday evening, another concern arrives as smoke from Canadian wildfires spreads into the region, prompting a statewide Air Quality Alert.
While each hazard can pose health risks on its own, the combination of extreme heat and poor air quality can place even greater stress on the body, particularly for people with asthma, COPD, heart disease, older adults, young children and those who work or exercise outdoors.
Tuesday night remains mostly clear and warm, with temperatures only falling into the lower 70s, offering limited overnight relief before another scorching day.
Wednesday will bring some of the warmest temperatures of the week. Temperatures will climb quickly through the morning, reaching around 90 degrees by lunchtime before peaking in the mid- to upper 90s during the afternoon. Skies will remain mostly sunny for much of the day, as the heat and humidity push the heat index values into the lower to mid-100s.
An isolated shower or thunderstorm may develop late Wednesday afternoon, but most communities will remain dry.
Attention then turns to the sky Wednesday evening for a different reason.
Smoke from Canadian wildfires will move south into Lower Michigan in the evening, becoming more widespread after sunset and lingering into at least Thursday morning. At times, dense smoke may reduce air quality enough to create unhealthy conditions for sensitive groups, with localized periods of even poorer air quality possible.
The combination of intense heat and smoky air can make it harder for the body to cool itself while also irritating the lungs and cardiovascular system. Even healthy adults may notice coughing, throat irritation or shortness of breath during prolonged outdoor activity.
Anyone spending time outside Wednesday should:
- Drink plenty of water before becoming thirsty.
- Take frequent breaks in air conditioning or shade.
- Avoid strenuous outdoor activities during the hottest part of the afternoon.
- Limit outdoor exercise Wednesday evening and Thursday morning if smoke becomes noticeable.
- Keep windows closed overnight and run air conditioning with a clean filter if possible.
- Check on elderly neighbors, relatives and anyone without reliable air conditioning.
- Never leave children or pets inside parked vehicles, where temperatures can become deadly within minutes.
Conditions begin improving Thursday as temperatures ease slightly into the lower 90s, though some lingering smoke may still affect the morning commute before gradually improving later in the day.
Rain chances increase Friday and continue at times through the weekend and into early next week. High temperatures trend downward into the upper 80s this weekend before settling into the lower to mid-80s by early next week, bringing a welcome break from the dangerous heat.
Share your weather photos, including the wildfire-enhanced sunrises and sunsets, with Local 4 at MIPics.