A trough of low pressure is moving over the Pacific Northwest and northern California, and it has already brought cooler air and gusty wind. A slight chance for showers and thunderstorms arrives Friday, but little rain will fall. More smoke continues to pour into the sky tonight, but blue sky is also visible. Tonight will be a mostly clear sky with some areas of smoke and breezes will continue. Lows will range from the 30s and 40s in the mountains to the 50s and 60s in the foothills and valley. Friday will be partly cloudy with breezy to windy weather for many areas. Scattered showers and isolated thunderstorms are possible, mainly over the mountains. Highs will fall again, ranging from the 70s to the mid and upper 80s.
Once the bulk of this weak storm system passes to the east, we will have fewer clouds and weaker breezes. We will have a mostly sunny and warmer weekend with a small ridge of high pressure briefly building over California. Another trough of low pressure will make a glancing blow to the region, but it will only deliver a few more clouds and stronger breezes. Another ridge will rebuild overhead next Tuesday and Wednesday, followed by another trough bringing stronger breezes next Thursday. Overnight lows will be seasonably mild through next week for all areas. Daytime highs will also be more seasonable and not as hot as we change from summer to fall. Highs will be in the 80s, with a few upper 70s and lower 90s.