The rain will become more persistent Wednesday, after showers move in from the west in the morning. More potent showers may bring in a few rumbles of thunder as well. Highs struggle to get out of the 50s along the shores of Lake Superior, although inland temperatures look to stay right around 60 degrees. Showers start to move out after sunset. Thursday will still be a little breezy across the region, and pop-up showers will linger around. Temper…