An strong low-pressure system off the Northern California coast will bring a variety of weather to the Sierra early this week.

The National Weather Service is calling for cooler temperatures, numerous showers and thunderstorms. The rain and snowmelt will also cause fast river flows.

Snow was even forecast for the 7,500 foot elevation Sunday night into Monday, according to the Weather Service. Light snow accumulations were possible above 8,000 feet and along mountain passes.

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In addition to bringing rain to the region, the low-pressure system has brought a return of cooler temperatures. Temperatures are expected to average around 10 to 15 degrees below normal through the early portion of this week, forecasters said. A gradual warm-up to near normal is expected by the middle of next week.

Even though cooler temperatures will slow the melting of the snow pack a bit the next few days, the Weather Service said rivers and streams will continue to run high and fast. Officials said boaters, swimmers and hikers should use caution when on or near the water.