08/26/2019 Forecast Update


Monday, August 26th, 2019 through Friday, August 30th, 2019

Ozone: 8-hour Ozone concentrations will be mostly Good through the forecast period.

PM-2.5: 24-hour Fine Particulate concentrations will also be mostly Good.


Rain develops Monday, continuing into Tuesday as a system moves through. A weaker boundary passes later Wednesday, and another on Friday, but the best chance for precipitation will be early in the week. High pressure then builds in for the Holiday weekend.

As for air quality, clouds and precipitation should keep air quality Good Monday and Tuesday. The exception may be the southwest corner of the state on Tuesday. Moderate ozone is a possibility if clouds clear out early in the day. This is shown on some forecast models so the forecast is Moderate in that part of the state to cover the threat. Good ozone is expected Wednesday, but levels could reach Moderate at a few locations on Thursday thanks to plenty of sunshine and seasonable surface temperatures. By Friday, high pressure brings cooler surface and upper level temperatures on a northwesterly flow; this upper level flow remains in place through Sunday keeping ozone mostly Good. Temperatures increase some Monday as high pressure moves east of the state; a few areas may see low Moderates for ozone.

Without much of a stagnant period though the week a significant build-up of fine particulate is not anticipated. Readings should remain mostly Good.


Extended models show southwest winds and warmer temperatures by Tuesday of next week. It’s too soon to tell if there is a chance for increased pollution, however, this forecast will be updated Friday to detail expected air quality conditions through the Holiday weekend, into next Tuesday.

Next forecast update: Friday, August 30th, 2019
Forecast by: Stephanie M. Hengesbach