As Jack Frost nips at Southern California, the National Weather Service in San Diego has issued a frost advisory for parts of the Inland Empire and San Diego County valleys. The warning continues to apply until 8 AM this morning, with another advisory slated from 11 PM tonight until 8 AM Monday, according to an advisory posted on the National Weather Service's website. Residents in the affected areas should anticipate temperatures dipping to the low 30s, bringing the risk of frost formation that could damage unprotected vegetation.

The areas most likely to bear the brunt of the cold snap include the valleys running between Perris and Temecula and areas near San Pasqual Valley and Ramona. "For the Frost Advisory this morning, temperatures 29 to 34 degrees in wind sheltered areas will result in frost formation," stated the advisory. And for the subsequent advisory tonight, local thermometers are expected to hover between 32 to 36 degrees.

While daytime temperatures are said to warm to near normal as the week progresses, the region isn't out of the woods yet. "Clear skies across much of the region are expected to continue through the day," the National Weather Service San Diego's Area Forecast Discussion notes, highlighting the gradual warming of daily highs through mid-week. However, the outlook beyond this period is not so clear-cut, with conditions predicted to turn cooler and wetter by next weekend into the week of February 18.

Southern California should brace for a possible atmospheric river potentially impacting the area starting the following Sunday, based on the 00Z Feb 11th run of the weather models. The current forecast, which follows NBM guidance, flags chances of measurable precipitation as early as Saturday morning—rising into Sunday night. No hazardous marine weather conditions are expected through Thursday, according to the National Weather Service San Diego-Area Forecast Discussion.

The frost advisory is a reminder for residents to insulate sensitive plants and bring pets indoors during the cold spell, mitigating the impact of the chill. The measures should protect tender vegetation from the imminent icy touch, ensuring that the greenery bounces back without a hitch once warmer temperatures resume.