After an overnight coating of snow, there could be a brief lull in snow showers Sunday before a significant winter storm system rolls in Monday night, the National Weather Service predicts. Scattered flurries are expected throughout the day Saturday, creating slick driving conditions, especially on elevated or less-treated roads, NWS Chicago said in a tweet. NWS Chicago currently predicts two rounds of the winter storm expected early next week that could affect travel conditions. “Our confidence is growing with those two main rounds of weather that could impact travel,” said meteorologist Zach…