Hydroplaning is a dangerous occurrence that sometimes happens to vehicles when it's raining. If your tires are not able to scatter water properly, a layer of water can build up between the tires and road, which causes hydroplaning. When hydroplaning occurs, it feels like your vehicle is skidding, and you may lose control of braking and steering.
Don't panic if your vehicle starts to hydroplane and try to avoid hard braking. If you slam on the brakes, the front wheels will slow but the back wheels could lock, and this could cause a spin out.
As soon as it starts to rain, slow down. Driving slowly in the rain gives your tires more capability to move water away from the surface of the road. It's also important that the tread on your tires is deep enough to grip the road in wet conditions. You can take a penny and place it in the tread upside down. If you see Lincoln's head, your tread is at an optimal depth.