Della, the warm, humid and calm nighttime pattern continues along Lake Michigan until late October. Halloween seems to be a good benchmark date for transition as it can be either very beautiful or very rainy and blustery. The exceptions to this pattern is when a frontal boundary line of storms approaches from the west. In that case, the updraft of those thunderstorms creates a vacuum below which draws air in off the lake creating a strong easterly (lake breeze). But this has a devastating affect on those storms as it undercuts their supporting updraft and they fall flat producing little or no rain or wind from the frontal passage. The end result is everything stays pretty calm, either way. My screen grab below shows how the draft off the lake demolished a line of storms as they crossed Wis. last night before they could reach the lakeshore. Edit added: The picture shows how much rain fell before they began to lose support and during their lose of support to a point where they no longer existed. End Edit. I only received .03 inches from it here; not even enough to be called a dew.
