A Frost Advisory is in effect early Wednesday for parts of Klamath, Lake, and Modoc counties as a cooler air mass and clearing skies could push temperatures into the low to mid 30s. Sensitive plants, pets, livestock, and agriculture may be affected.

A spring-like weather system is expected to bring much cooler temperatures, widespread showers, isolated thunderstorms, and gusty winds to Southern Oregon and Northern California through Saturday. Snow levels may lower near 6,000 feet late Friday into Saturday, with chilly mornings expected Sunday and Monday.