With the west- to east-flowing upper air jet stream expected to remain well to our north, cold air masses will linger over parts of Canada for much of the week ahead. That means Chicago is in line for an extended period of seasonably mild temperatures that should peak Wednesday and Thursday.
One storm system after another will sweep off the Pacific, dumping precipitation over the Pacific Northwest. The westerly flow aloft will steer a stream of relatively mild dry maritime air across the Midwest. Most of the nation will experience mild tranquil weather, although a nearly stationary low-pressure system off the Carolina coast will keep a strong east to northeast onshore flow from Florida to Virginia. Combined with the high astronomical tide, that will cause shoreline flooding and erosion.