Rain and Water Levels
Parts of the country have been wetter than usual over winter. It is a good idea to check the water level of your pool after a large downpour. If your water level is too high, your skimmer can't do it's job by removing all the debris off the surface of the water. High water level can also cause damage to automatic pool covers.
While there is extra water in your pool it is a good time to vacuum to waste and finish by backwashing your filter until the water runs clear. This way you remove any fine particles from the bottom of your pool and lower water levels at the same time.
The correct water level is usually about halfway up your skimmer box, some skimmer boxes show the correct level on them.
While you are at it, it is a good idea to empty your skimmer basket.