Storms will open and close first week of spring

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

Early spring is often a turbulent period in Chicago as the clashing air masses of departing winter and approaching summer struggle for supremacy, resulting in snow, thunderstorms and wildly-fluctuating temperatures.

As astronomical spring begins at 5:29 a.m. Monday, this week’s weather will be right in step. It will start out mild with 50s both Sunday and Monday, but a sharply cooler period of mid-week 40s will follow a round of gusty Monday night thunderstorms.

Milder weather is set to return by Friday, but with a threat of potentially strong thunderstorms followed by another chill and even some snow across the upper Midwest.