Rain showers — and some snow at higher elevations — are in the forecast for the Inland Empire during the last week of 2022, according to the National Weather Service.
The agency said that several troughs of low pressure will move southward from the Gulf of Alaska and drag across the region Tuesday through Saturday, though it was too early to tell how much precipitation might be associated with the systems.
The NWS said the conditions will be in steep contrast to Christmas weekend, during which temperatures are expected to be 10 to 15 degrees above average, with clear skies, as a ridge of high pressure anchors itself over the Great Basin of Nevada and Utah.
As for the storm fronts, forecasters said a dip in the jet stream will be the impetus for the last winter weather of the year. The NWS released a statement noting that “rainfall amounts (may range) anywhere from a few tenths of an inch to around 2 inches — and that’s just for the initial wave late Tuesday and Wednesday.”
“Uncertainty grows from there, as ensemble solutions diverge in the track and depth of the short wave that follows for Thursday, and the additional waves later in the week, into New Year’s Day,” the agency stated.
Prognostication charts released by the agency indicated light bands of precipitation reaching the inland region and elsewhere in Southern California on Tuesday night, with heavier bands possible as the week progresses.
“Snow levels are in question, as they will largely depend on the depth of the troughs,” the NWS said. “They start out quite high — close to 9,000 feet Tuesday night — lowering to around 6,500 feet by Wednesday night.”
No winter weather advisories have yet been issued for the region.
The mercury is expected to fall back to seasonable norms for the duration of the storm activity. According to meteorologists, high temperatures in the Riverside metropolitan area will top out in the low 60s beginning Tuesday, with highs not rising above 60 for most of the week afterward, and lows generally in the upper 40s.
The highs in the Temecula Valley will climb into the low 60s Tuesday, but for the balance of the week, the daytime mercury will hover in the upper 50s, with lows similar to the Riverside metro area, according to the NWS.
For the Coachella Valley, daytime temperatures will settle in the low to mid 70s for the first half of next week, with lows in the upper 50s. However, from Thursday to New Year’s Eve, highs will not top 70, and nighttime temps will be in the mid 50s.