Flash flood guidance systems are like special tools that help people know when there might be a really big flood coming. Imagine if you were playing outside in your backyard and suddenly, it started to rain super hard. The ground would quickly get wet and there could be a lot of water everywhere.
But some places can get a lot more water than others. That's why scientists use special flash flood guidance systems to help figure out which areas might get the most water and have the biggest floods.
These systems work by collecting a lot of information about the weather and the area where the flooding might happen. They look at things like how much rain has fallen in a certain area, how much water is already in the rivers and lakes nearby, and how much water the ground can absorb.
All of this information is put into a special computer program, which helps the scientists make predictions about where the floods might happen and how big they could be. If the system thinks there could be a really big flood, it sends out alerts to people who live in the area so they can be prepared and stay safe.
So basically, flash flood guidance systems help people know when there might be a really big flood coming, so they can be ready for it and stay safe.