A few degrees warmer than normal today then several degrees warmer than normal over the weekend. A slight cool off early to middle of next week but still a few degrees above normal. No precipitation is expected but still expect areas of smoke and or haze to continue.
Discussion
An upper level trough now moving into the Pacific Northwest and northern California brought some high clouds to the northern CWA last evening but these clouds are now moving east of the forecast area. The upper trough axis should move east of the CWA this afternoon allowing high pressure to begin rebuilding off the west coast. As a result, daytime highs today are forecast to come in just a bit higher today and a few degrees above normal.
Upper ridge axis then centers over the west coast on Saturday bringing more warming with daytime maximums expected to climb to several degrees above normal. Afternoon humidity values will drop into the teens most areas Saturday increasing fire potential.
Upper ridge axis shifts quickly eastward and by Sunday afternoon, west coast will already be coming under the influence of the next eastern Pacific trough. Increased onshore flow will bring slightly cooler temperatures although highs Sunday will likely remain several degrees above normal. Stable southwest flow aloft should continue to keep any precipitation threat out of NorCal.
Upper low pushes into the Pacific Northwest and NorCal on Monday bringing still more cooling with highs expected to come in just above normal. Still looking at dry conditions going into next week although continued onshore flow should bring up humidity values a bit. Slightly elevated southwest winds are expected over the higher terrain in the afternoon and evening hours.
Extended Discussion (Tuesday through Friday)
After some minor cooling early in the week, seasonably hot weather is expected to return by the middle of next week as high pressure strengthens. Enough westerly/southwesterly flow expected to limit potential for deep convection over the mountains.