California needs all the rain it can get now, because it certainly isn't going to come in May. On average, May is one of the driest months on the West Coast. The normal May rainfall in San Francisco is less than a half of an inch and in Los Angeles it is barely a quarter of an inch.

The storm of concern is still currently off the coast of central California; however, it will move ashore by later today bringing rain to the northern two-thirds of the state. The track of this storm will lead to the most substantial rain falling across central and and northern California with very little rain farther north into Oregon. The rain will spread into Southern California tonight and continue into Wednesday. This is not the type of system that produces serious flooding and mudslides, but will bring a rainfall that soaks into the ground and that is exactly what we need.

There could even be a few thunderstorms, especially across the southern third of the state as the cold front pushes through late on Tuesday night and into Wednesday. These storms could bring brief heavy downpours and even some small hail.

Story by AccuWeather.com Meteorologist Eric Leister