FORECAST SUMMARY:
Monday, December 16th, 2019 through Monday, December 23rd, 2019
PM-2.5: 24-hour Fine Particulate concentrations will range between Good and Moderate through the forecast period.
FORECAST DISCUSSION:
The coming week will be quiet for the most part weather wise as a larger storm system remains south across the Ohio River Valley Monday into Tuesday. A weak system could bring snow late Tuesday/Wednesday, and then high pressure builds east of the state past mid-week. This high remains east/southeast through the coming weekend. Temperatures are expected to be moderate during the weekend.
Weaker winds Monday could allow for some Moderate fine particulate, especially across the southern portion of the state. Northwesterly winds develop Tuesday and are reinforced Wednesday; expect mostly Good fine particulate. High pressure passes over-head Thursday and weaker winds, coupled with a likely morning inversion, will cause areas of Moderate fine particulate. Winds pickup in speed later in the week from the southwest. Stagnant conditions are not expected; however, southwesterly winds bringing in warmer temperatures which will keep a mix of Good and Moderate fine particulate in place.
EXTENDED FORECAST:
Extended forecast models don’t show any significant storm systems through early next week. Warmer than normal temperatures and a southwesterly wind may allow for mostly Moderate fine particulate.
Next forecast update: Monday, December 23rd, 2019
Forecast Updated by: Stephanie M. Hengesbach, Meteorologist, Air Quality Division, Michigan Department of Environment, Great Lakes, and Energy