Monday, December 17th, 2018 through Friday, December 21st, 2018
PM-2.5: 24-hour Fine Particulate concentrations will be generally Good except for Wednesday and Thursday when widespread Moderates are expected.
A weak front will pass through Michigan during Monday with little fanfare. The primary result of this passage will be a wind shift to the northwest which will help clean out the higher particulate numbers we observed, last week. With that frontal passage, I expect mostly Good to Low Moderate concentrations through Tuesday.
As high pressure drifts over the region during mid-week, winds will return to a southerly direction and a short warming trend. This will likely push PM-2.5 concentrations back into the Moderate range. I expect this to last Wednesday into Thursday.
Another cold front should pass through the state later Thursday. This should push winds back to a northwesterly direction and clean out any residual Moderates. Mostly Good conditions should persist Friday through the weekend.
Since the State offices will be closed Christmas Eve and Christmas Day, a short update will be issued on Friday.
Air Quality is expected to remain mostly Good going into the Christmas holiday week.