A low pressure system will be moving across the Ohio Valley by the end of the week, and showers are likely all day on Friday, with a few thunderstorms possible. As this time, I expect that most of the rain with this system to exit Indiana by Saturday morning, but due to uncertainties with timing, I'm going to mention a slight chance of showers on Saturday. Some isolated afternoon showers and thunderstorms will be possible Sunday afternoon, but right now, it appears more likely that the track will stay dry that day.It will be getting warmer through the weekend, with highs close to 80 on Saturday, and in the lower 80s on Sunday.