A Winter Weather Advisory has been issued for Green County in south-central Wisconsin beginning late Monday night, lasting through Tuesday morning. Cloud cover will remain in place through the evening Monday as low pressure moves along a cold front to the southwest. As the low moves closer, moisture will increase along the front producing light rain showers by about 9pm/10pm Monday evening.
Colder air in place over Wisconsin and northwest Illinois will lead to light snow developing between 11pm and Midnight. As the colder air moves east overnight, a transition over to snow – or at least a rain/snow mix – will occur for most across northern Illinois and southern Wisconsin. Minor accumulations are possible, with the highest totals taking place in Wisconsin and far northwest Illinois. There, one to two inches could come down but mostly on grassy surfaces. Further east, including Rockford, around an inch of snow will fall.
Any wintry weather will be quick to wrap up before sunrise Tuesday, so I don’t anticipate too much of an impact on roads and the morning commute. However, where the snow comes down a little faster slushy accumulations will be possible.