Rains make roads slippery.
The California climate makes those roads much slipperier as long periods of dry weather allow oil and grease to build up on the roads.
The oil and grease are less dense than the rain water, which lifts the oil to the surface.
The National Highway Traffic Safety Administration says that the most dangerous period of travel is within the first 10 minutes of rainfall.
They also say that hydroplaning can occur at speeds as low as 30mph.
Carol Howard of A Plus Safety in Redding recommends checking a variety of things from your windshield wipers, to your tire pressure and tread wear.
A bald tire can hydroplane much easier than a tire with tread on it.
But their ultimate safety tips are to keep your headlights on when your wipers are on and to just slow down.
Even when your car has good tires hydroplaning can happen nearly anywhere.
When that happens your tires are skimming across the surface like a stone, which means your tires don’t have traction with the road, and you can’t control your car.