Genesee County, MI Warnings, Watches and Advisories

Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards Genesee County.

Use the Radar Maps link provided to understand the trajectory of a storm.

Air Quality Alert issued June 20 at 11:18AM EDT by NWS Northern Indiana

The Michigan Department of Environment, Great Lakes, and Energy (EGLE) has declared an Air Quality Advisory for Saturday June 21, for elevated levels of ozone in parts of southwest Michigan. Pollutants within those areas are expected to be in the Unhealthy for Sensitive Groups (USG, Orange AQI) range. The Air Quality Advisory is in effect for the following counties in southwest Michigan... Berrien and Cass We are in the peak of ozone season, and the current forecast shows ozone-conducive conditions for Saturday. Surface temperatures in the 90s, coupled with ample sunlight and southwest winds, create an environment favorable for ozone development along the Lake Michigan shoreline. It is recommended that, when possible, you avoid strenuous outdoor activities, especially those with respiratory diseases such as asthma. People and businesses are urged to avoid activities which lead to ozone formation. These activities include: * refueling vehicles or topping off when refueling; * using gasoline powered lawn equipment; * using charcoal lighter fluid. Positive activities include: * driving less; * telecommuting; * walking or bike riding; * delaying or combining errands; * using water-based paints. For up-to-date air quality data for Michigan visit the MiAir site: https://air-egle.hub.arcgis.com/ For up-to-date air quality data nationally visit EPA's Air Now site: https://www.airnow.gov/

Air Quality Alert issued June 20 at 11:04AM EDT by NWS Grand Rapids MI

Air Quality Advisory for Saturday June 21, 2025 The Michigan Department of Environment, Great Lakes, and Energy (EGLE) has declared an Air Quality Advisory for June 21, 2025, for elevated levels of ozone in southwestern counties of Michigan. Pollutants within those areas are expected to be in the Unhealthy for Sensitive Groups (USG, Orange AQI) range. The Air Quality Advisory is in effect for the following Michigan counties: Allegan, Kent, Muskegon, Ottawa, and Van Buren We are in the peak of ozone season, and the current forecast shows ozone- conducive conditions for Saturday. Surface temperatures in the 90s, coupled with ample sunlight and southwest winds, create an environment favorable for ozone development along the Lake Michigan shoreline. It is recommended that, when possible, you avoid strenuous outdoor activities, especially those with respiratory diseases such as asthma. People and businesses are urged to avoid activities which can lead to ozone formation. These activities include: refueling vehicles or topping off when refueling; using gasoline powered lawn equipment; using charcoal lighter fluid. Positive activities include: driving less; telecommuting; walking or bike riding; delaying or combining errands; using water-based paints. For up-to-date air quality data for Michigan visit the MiAir site: https://air-egle.hub.arcgis.com/ For up-to-date air quality data nationally visit EPAs Air Now site: https://www.airnow.gov/ Air Quality Advisory Michigan Department of Environment, Great Lakes, and Energy June 20, 2025

Extreme Heat Watch issued June 20 at 9:49AM EDT until June 24 at 8:00PM EDT by NWS Grand Rapids MI

* WHAT...Dangerously hot conditions with heat index values of 100 to 105 degrees possible. * WHERE...Portions of south central and southwest Michigan. * WHEN...From Saturday afternoon through Tuesday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Extreme Heat Watch issued June 20 at 3:55AM EDT until June 24 at 8:00PM EDT by NWS Northern Indiana

* WHAT...Dangerously hot conditions with heat index values between 95 and 106 possible. The hottest conditions are expected on Sunday and Monday. * WHERE...Portions of northern Indiana, southwest Michigan, and northwest Ohio. * WHEN...From Saturday morning through Tuesday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Consecutive days of excessive heat and humidity combined with very warm low temperatures in the 70s can be especially hazardous for vulnerable populations as the overnight hours provide little relief from the heat.

Extreme Heat Watch issued June 20 at 2:51AM EDT until June 24 at 8:00PM EDT by NWS Detroit/Pontiac MI

* WHAT...Dangerously hot conditions with heat index values up to 104 possible. * WHERE...All of southeast Michigan. * WHEN...From Saturday morning through Tuesday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Consecutive days of heat indices near or above 100 combined with overnight low temperatures remaining in the 70s will lead to dangerous conditions through the start of the week.