This is a computer model known as the "GFS". It's not great with its long range accuracy, but it has been consistant with what may happen by the middle and end of the week.
First of all, It will feel like autumn in the Great Lakes as an unusually strong cold front moves out of Canada. Most of the time these fronts can't make it through the heat and humidity of the south. This particular one shows signs of stalling somewhere around southern Arkansas by Friday and Saturday. Nevertheless, rain and storm chances will be enhanced by the front and temperatures will only make it into the 80s for highs with cloud cover. Some eastern Arkansas farmers still need rain and there's hope over the coming week. One thing for sure, this summer will more than likely go down as an unusual one.