The National Weather Service say heavy rainfall could result in some flooding.
The National Weather Service say it's been a dry summer. However, the rains over the weekend got the ground fairly wet, and now if more rain comes Monday night, it could start to puddle and pool.
When the soil in the ground gets dry because of a lack of rain, it also gets hard and makes it so that moisture can't get into the ground. Then, when thunderstorms bring heavy rainfall, the ground can't take the water in as fast as it falls. It leads to water that could flood in low-lying areas, even if the ground was dry just a few days before.
"We were running a deficit. We were actually in a low-end drought over parts of Northeast Wisconsin,” explained Jeff Last, the NWS Warning Coordination Meteorologist. “We certainly have picked up some rain to help alleviate that, and then in fact we may end up with too much rain as we watch this system tonight."
That problem could especially be true, if the rain comes very quickly. The speed of the rainfall could also be an issue at local rivers and streams.
Experts say because it's been an abnormally dry summer, the rivers and lakes are low. Still, it's something they'll be monitoring if a lot of rain comes overnight.