Seasonably hot weather for northern California on Monday as a few fires continue to burn, and isolated showers and thunderstorms have popped over the Sierra. A Red Flag Warning is in effect for Lassen, Plumas and Sierra counties on Tuesday, with a Fire Weather Watch for those counties as well as Modoc and eastern Siskiyou counties. Tonight will be a mostly clear and mild night with lows in the 50s in the mountains with 60s and lower 70s in the foothills and valley. Tuesday will be a mostly sunny and hot day with isolated mountain thunderstorms and smoke from our area fires. Highs will be mainly in the 90s, with a few upper 80s and a few lower 100s.
Stronger breezes are possible Wednesday through Friday as a weak trough moves over and past California. We can expect a few clouds, isolated mountain showers and thunderstorms, and a minor cooling of our highs. Another ridge of high pressure will start building back over the western United States this weekend and early next week, with more sunshine, weaker wind and warmer high temperatures. Overnight lows will continue to be mild, ranging from the upper 40s and 50s in the mountains to the 60s and lower 70s in the foothills and valley. Daytime highs will be fairly seasonable, ranging from the mid and upper 80s to the upper 90s and lower 100s.