Victor Valley and Barstow residents may want to enjoy the partly sunny skies and pleasant temperatures on Thursday before a storm sweeps in to Southern California.

A “strong Pacific storm” is expected to shower the region with plenty of rainfall as it moves throughout Southern California starting Thursday night, according to the National Weather Service.

“As the storm develops, the typical rainfall pattern of mountain shadowing, with more in the mountains than on the coast, is not expected,” the NWS said. “Instead, heavier amounts are forecast over northern areas.”

The storm will also bring “a very strong southerly wind” over the area by Friday evening, which is expected to bring heavy rainfall rates to the Orange County area and San Bernardino Mountains. The NWS predicts these areas will see anywhere from 3 to 7 inches this weekend, and high snow levels are also expected in the mountains.

The Mojave River is expected to record “significant flows,” and flooding may be seen at low-water crossings, stream banks, or poorly drained urban areas. The Santa Ana mountains, the Cajon Pass area, the Bluecut Fire burn scar and the upper Mojave River basin are listed as areas with the greatest potential for flooding during the storm.

“Aquifers below our main stem rivers have filled sufficiently so that the coming rain will likely result in significant flows in all rivers and streams,” the NWS said.

Skies in the Victor Valley and Barstow are expected to remain mostly sunny throughout Thursday, when strong winds are predicted to begin. Rainfall may begin Thursday night and will continue through Friday and Saturday.

Barstow is expected to see one-third to two-thirds of an inch of rain on Friday, but less than a quarter-inch on Saturday. Temperatures will be in the high-50s during the day and mid- to high-40s at night on Friday and Saturday, before warming into the 60s on Sunday.

The Victor Valley is expected to see 1 to 2 inches of rain Friday, but less than a quarter-inch on Saturday. Daytime highs will drop to the low-to-mid 50s on Friday and Saturday, with nighttime lows expected to drop to the low 40s, according to the NWS. Skies will clear and temperatures will rise starting Sunday, but a slight chance of showers is still predicted until Monday night.

Paola Baker may be reached at 760-955-5332 or PBaker@VVDailyPress.com. Follow her on Twitter at @DP_PaolaBaker.