A storm system pounding the northwestern tier of the nation will gradually slide across California, bringing rain to the Inland Empire Sunday night into Tuesday, according to the National Weather Service.

Forecasters said that the deep trough originating from the Gulf of Alaska will dive into Central California over the weekend and drop into the bottom half of the state by Sunday night, tapping into an “atmospheric river” that will fuel widespread showers across Riverside and San Bernardino counties.

“Higher rainfall totals are expected for Central California, but we will still see widespread precipitation in Southern California on Monday,” according to an NWS statement. “Broad southwest flow will enhance the upslope flow, and the rainfall amounts in the San Bernardino Mountains, where 1 to 1 1/2 inches of precipitation is forecast. In the Inland Empire and Orange County, rainfall amounts of .3 to .75 inches are forecast.”

The Weather Service noted that the system will not generate appreciable snowfall at higher elevations because it is enveloped by “warm, subtropical” air.

“Snow levels will drop to around 7,500 feet Tuesday morning once the system passes, but little, if any, precipitation will fall during that time,” the NWS stated. “So this will be an all-rain event for the mountain communities. A dusting of snow may occur on the highest peaks of the San Bernardino Mountains.”

The trough will trundle east on Tuesday, overtaken by a ridge of high pressure that will restore dry conditions, forecasters said.

As the storm rotates through the area, it will likely trigger southwest winds, with 40 mph gusts possible in mountains and passes, according to the Weather Service.

In the Riverside metropolitan area, the high temperature Sunday will be in the low 70s, with slightly cooler temperatures on Monday and Tuesday, while lows will generally be around 50 degrees. In the Coachella Valley, the highs will hover in the upper 70s Sunday to Tuesday, with lows in the upper 50s, and in the Temecula Valley, the high Sunday is expected to top out at 70, followed by highs in the mid-60s Monday and Tuesday, and lows in the mid-50s.

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