06/17/2019 Forecast Update


Monday, June 17th, 2019 through Thursday, June 20th, 2019

Ozone: 8-hour Ozone concentrations will be mostly Good with scattered Moderates possible Tuesday.

PM-2.5: 24-hour Fine Particulate concentrations will range from upper Good to middle Moderate.


Generally quiet conditions start the week with high pressure in place. Clouds and cooler temperatures Monday will keep ozone generally Good; however, weaker winds may allow for Moderate fine particulate in the southeastern portion of the state. More sunshine is expected Tuesday as winds remaining light and upper level temperatures cool. Ozone may increase into the Moderate range and scattered Moderate fine particulate may linger as well. The next weather system approaches Wednesday bringing in clouds and chances for precipitation. The heaviest rainfall looks to occur across the southern portion of the state. A few Moderates for fine particulate may continue; Good ozone is expected. Northerly winds develop Thursday after the Wednesday system passes. Both ozone and fine particulate will be Good.

High pressure settles over the state Friday with temperatures warming at the surface. Plenty of sunshine is anticipated which could allow for increased ozone, but cooler upper level temperatures may hamper ozone development. There is enough risk for increased readings; therefore, we will be evaluating weather conditions Thursday to get a better handle on expected pollution levels for Friday.


Extended models show more summer-like temperatures for the coming weekend, but it also comes with storm chances. It may be a set-up where ozone will quickly develop in areas with only a few hours on sunshine. Updated information on the extended forecast can also be expected Thursday.

Next forecast update: Thursday, June 20th, 2019
Update by: Stephanie M. Hengesbach, Meteorologist, Air Quality Division, Michigan Department of Environment, Great Lakes, and Energy