06/29/2019 Forecast Update


Saturday, June 29th, 2019 through Monday, July 1st, 2019

Ozone: 8-Hour average Ozone concentrations will be a mixture of Good and Moderate through Monday.

PM-2.5: 24-hour average Fine Particulate concentrations will be mostly Good with some Low Moderate.


Rain showers in the mid and upper portion of the Lower Peninsula, during Friday, provided a nice cleanout and kept all monitors below USG levels. As a weak front slips down into Indiana/Ohio, weak northerly flow will set up in Michigan as high pressure builds in.

The high pressure and northerly flow are expected to continue throughout Sunday which will result in relatively pleasant summertime conditions with sunny skies, calm to light winds, and daytime highs persisting in the low to mid-80s. Since the northerly winds will be clean in nature, Air Quality will be in the Good to Moderate range. The only caveat is that the winds, albeit northerly and clean, will be light in nature. This could allow some stagnation to occur in urban areas and a lake breeze could draw in some dirtier air over the lake. These scenarios fall into a low percentage category and Moderate is the worst we will see.

High pressure will continue to build and hold over the upper Midwest which will allow weak shortwaves to ride across the northern tier of that ridge that will set up over Michigan. Increase in instability and passage of multiple waves will bring the chance for showers and storms everyday next week.


Air Quality is expected to remain mixedGood to Moderate going into the next work week.

Forecast updated by Jim Haywood: Saturday, June 29th, 2019 | Next forecast update: Monday, July 1st, 2019

Jim Haywood ǀ Senior Meteorologist ǀ Air Quality Division ǀ  ( 517.284.6745