FORECAST SUMMARY:
Monday, April 27th, 2020 through Monday, May 4th, 2020
PM-2.5: 24-hour Fine Particulate concentrations will range from middle Good to low Moderate through the forecast period.
FORECAST DISCUSSION:
A weak disturbance drops in from the northwest Monday with increasing clouds and chances for precipitation moving from northwest to southeast. Precipitation then remains in the forecast as a low-pressure area develops and slowly tracks across the Great Lakes region through Thursday. Seasonable temperatures are expected with a predominant southerly component to the wind. This will change Thursday, however, as cool northerly winds develop behind the departing system. High pressure Friday brings precipitation to the end as temperatures moderate closer to normal.
As for air quality this week, light and/or southerly winds could allow for periods of low Moderate fine particulate, especially in southern portions of the state. Fine particulate levels improve later Thursday with northerly winds moving in; Good fine particulate is expected for Friday.
EXTENDED FORECAST:
Extended forecast models show a weak front passing late Saturday into Sunday. The timing or strength of this system isn’t clear this far out; however, temperatures should remain seasonable. Without models showing an extended period of stagnation, fine particulate through early next week should not reach higher than low Moderate.