We finally have some good news in your air quality forecast this morning. The entire valley is showing good air quality to start the day and we're in the moderate to unhealthy for sensitive groups range in most foothill and mountain areas. Gusty south winds have helped to improve air quality, but will also contribute to elevated fire danger concerns today. A Red Flag Warning for high fire danger is still in effect for portions of Plumas and Lassen Counties, and is set to stay in effect through 11PM tonight. Wind gusts up to around 40mph are projected, with stronger gusts possible along ridge tops. Humidity will be higher today, which is going to result in slightly better fire danger conditions than yesterday.
Low pressure tracking towards the Pacific Northwest is driving strong south winds through our region, and will result in much cooler temperatures today. We will also have a decent chance for at least some light showers moving through the northern portions of our region this afternoon and evening. The threat of thunderstorms is expected to stay to our north. Temperatures are starting out in the 60's to low 70's in the valley, in the 60's in the foothills, and in the 40's to 50's in most mountain areas this morning. Winds are out of the south to around 15mph to start the day and will stay in that same range this afternoon. Gusts to 20mph will be possible in the valley, while foothill and mountain areas will have potential for gusts up to around 35mph. Humidity will be much higher this afternoon, and is mostly expected to bottom out at around 24 percent in the Sierra and Southern Cascades. This is good news for fire danger, but the gusty winds are keeping us in the high range today. High temperatures will top out in the mid 70's to low 80's in the valley, and in the upper 60's to mid 70's in the mountains and foothills this afternoon.
Low pressure tracks to the east through this weekend, and high pressure will rebuild across northern California. This will result in dry and warmer conditions returning over the next few days. Winds up to around 10mph out of the north are expected this weekend, and that could result in the return of bigger air quality impacts over the next few days. Temperatures are projected to top out in the low to mid 80's in the valley on Saturday and in the mid 80's to low 90's in the valley on Sunday. Mountain and foothill areas will end up in the mid to high 70's on Saturday, and high 70's to mid 80's on Sunday. Monday will have very similar conditions to Sunday, but most areas are expecting a drop of a degree or two in high temperatures. The official start of the fall season is on Tuesday, and we do actually have a modest dip in temperatures expected on that day. Valley ares will mostly top out in the mid 80's, while higher elevations end up in the 70's to low 80's. We'll see a modest jump in temperatures on the way for the middle of next week.