FORECAST SUMMARY:
Friday, June 4th, 2021 through Saturday, June 5th, 2021
OZONE: 8-Hour average Ozone concentrations are expected to range from Moderate to USG.
PM-2.5: 24-hour average Fine Particulate concentrations will be in the upper Good to middle Moderate range.
FORECAST DISCUSSION:
The forecast is on track for a continued warm-up as we progress into the weekend. Aside from small chances for rain in the upper peninsula Saturday through Sunday, the forecast is calling for mostly sunny skies, warm surface and upper-level temperatures, and stronger winds from the west/southwest. Ozone concentrations reached low-end USG Thursday along portions of the West Michigan lakeshore. A few locations may reach low-end USG Friday; however, by Saturday more widespread USG readings are expected. Because of this, we are issuing an Air Quality Action Day for much of west Michigan, from north to south along the western lakeshore and on county inland.
Ozone has been slower to increase in the southeastern portion of the state, likely because of more cloud cover Thursday. Ozone in the central and eastern areas should remain Moderate Friday, but conditions by Saturday become more conducive for ozone development. We are also issuing an Air Quality Action Day for southeastern areas Saturday to cover the threat of increased ozone.
Fine particulate readings have been consistently in the upper Good to low Moderate range, and levels in the range will continue through the weekend.
EXTENDED FORECAST:
Extended forecast models are hinting at chances for storms around Monday/Tuesday of next week. Until cleanout of the current airmass, we will be doing daily updates for the air quality forecast.
Forecast updated by Stephanie Hengesbach: Friday, June 4th, 2021
Next forecast update: Saturday, June 5th, 2021