FORECAST SUMMARY:

Monday, September 27th, 2021, through Monday, October 4th, 2021 

OZONE: 8-hour average Ozone concentrations are expected to be Good through the forecast period.

PM-2.5: 24-hour average Fine Particulate concentrations will range mostly Good with a few low Moderates possible.

FORECAST DISCUSSION:

A cold front passing north to south through the state Monday will do little but increase clouds for a time as it passes by. High pressure then settles into the region becoming the dominating weather feature for the rest of the week. Expect seasonable fall conditions with comfortable temperatures and generally sunny skies. Southerly winds before the Monday frontal passage turn more northeasterly, then southeasterly through Friday.

As for air quality, a few hourly low Moderate fine particulate concentrations further south will improve during the day with a Good 24-hour average expected statewide. Cooler surface and upper-level temperatures, along with an easterly component to the wind, will keep both fine particulate and ozone generally Good through the week.

EXTENDED FORECAST:

Extended models show a weather system possibly moving in during the weekend into early next week which could bring some scattered, light precipitation. The exact timing and location for this system is not clear at this time, but regardless of how the system pans out, ozone will remain Good during the weekend into next week, and fine particulate would not reach higher than low Moderate.

Forecast updated by Stephanie M. Hengesbach, Friday, September 27th, 2021. Next Forecast update: Monday, October 4th, 2021