A spring storm moving in from the north was expected to deliver days of heavy rain, mountain snow and gusty winds to the Southland, forecasters said Sunday.

The National Weather Service is forecasting a 50% chance of rain Sunday throughout most of Los Angeles County, with a possibility of snow in the mountains above 6,000 feet.

The county might also experience thunderstorms on Monday and Tuesday.

Rainfall on Sunday and Monday is supposed to range from moderate to heavy, according to the NWS. Between an inch and 2 inches of rain is expected along the coasts and in the valleys, 1.5 to 3 inches in most mountain areas, but in the San Gabriels, it could reach 3 to 5 inches.

The major part of the storm is predicted to last through Tuesday, with lingering showers possible through Thursday.

Potential impacts of the storm include urban roadway flooding, travel delays and mud and debris flows in burn areas and on canyon roads, according to the NWS.

Wind gusts were expected to range between 45 and 55 miles per hour.

The NWS predicts the region is on track for “significant and unseasonable amounts of (rain) over the next few days. In fact, there is the potential for many areas to receive rainfall far exceeding what we normally see for the entire month of April, including downtown L.A.,” where the average annual rainfall is about 9/10 of an inch.

The entire system is expected to be gone by Friday, when it is expected to be warm and dry.

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