Most of what we are dealing with for the start of the week is a stalled front over Kansas. The highest chance for strong storms will be in northern Kansas, but other isolated storms will develop in central and southwest Kansas late in the day. Storms will move to the northeast after developing.
On Tuesday, a few isolated storms will develop in western and northern Kansas, and move to the north. Severe weather is very unlikely Tuesday afternoon or evening.
Tuesday night, storms will develop down across Oklahoma and move to the north. That's when areas east of I-135 will get involved in the rain and thunder. It's unclear how strong the storms will be, but severe weather will be a concern Wednesday afternoon for central and eastern Kansas.
Once we get to the second half of the week, another front will stall over south central and eastern Kansas, which will only lead to more chances for rain and storms. We haven't had a setup like this in quite some time, but with a stalled front and stormy weather coming from the west, it shouldn't be that much of a challenge to get rain to fall in places that definitely need it.