The first in a trio of storm systems is expected to roll into the region from the north in the predawn hours Monday, according to the National Weather Service.
Forecasters predict at least a half-inch of precipitation will hit the Riverside metropolitan area Monday going into Tuesday. As one trough of low pressure edges eastward, another will slip in behind it, preceded by a cold front, meteorologists said.
“Another wave of energy moves through the trough on Wednesday, where chances for rain and mountain snow increase yet again,” the National Weather Service stated.
That may ratchet up chances for another half-inch to an inch of rainfall in valley locations, the agency said.
“Mountain snow looks to be the greatest impact of this winter storm,” the NWS said. “Potentially significant snowfall will create hazardous travel and possible power outages … At the 6,500 foot level in the San Bernardino and Riverside County mountains, there is around a 75% chance of at least 12 inches of snow.”
The third storm system is expected Thursday, but meteorologists say the moisture levels are unconfirmed.
A wind advisory will be in effect from 7 a.m. to 8 p.m. Monday in the areas of downtown Riverside, Temecula, Hemet, where winds between 15 to 25 mph and gusts of 30 to 45 mph are expected.
“Winds will be strongest with the passage of the cold front. The front is currently expected to pass through Orange County/Inland Empire early Monday afternoon and San Diego County late Monday afternoon,” the NWS announced.
Sunday’s highs were expected to cool down a little, settling at about 62 in downtown Riverside and 68 in Palm Springs. By Tuesday, daytime temperatures will drop significantly and remain cooler for the rest of the week, lingering in the mid-50s and even dropping to the upper 40s Wednesday and Thursday in Hemet.
Overnight lows will stay in the 40s next week throughout most of Riverside County.