Discussion
Mid and high clouds associated with the weak low approaching far northwest California have spread across the region to the north of Sacramento while skies remain clear to the south. Surface pressure gradients are rather weak and the marine layer remains shallow (around 1k ft in depth). Current temperatures remain mild and are similar to readings from 24 hours ago and range from the 70s to mid 80s across the Central Valley.

Only minor cooling is forecast into early next week as high pressure weakens slightly over the area. While not as hot as this past week, high temperatures will still be several degrees above average for early September with warmest portions of the Central Valley climbing to around 100 through Monday. Overnight lows will be a little cooler and HeatRisk is expected to be in the Minor to Moderate categories. Humidity will remain low with daytime minimums mainly in the teens across the lower elevations and 20s in the mountains. More substantial cooling may begin Tuesday as a stronger upstream trough approaches from the Gulf of Alaska.

.EXTENDED DISCUSSION (Wednesday THROUGH Saturday)...
Deep upper low progged into the PacNW Wednesday with associated troughing dropping into NorCal. Model differences exist with depth of this wave with EC showing a deeper system than GFS. NBM showing associated precip potential over our mountains, from I-80 northward, and in the Northern Sac Valley Wednesday into Wednesday evening. In addition, system will bring synoptic cooling and some gusty wind. Highs Wednesday expected in the mid 80s in the Central Valley with 50s to 70s for the mountains and foothills.

Wave pushes into the Great Basin Thursday as weak upper ridging begins to build into NorCal through the remainder of the week.
Some northerly wind will occur as humidity trends down. RH looks to remain high to limit elevated fire weather concerns. AMS warms Thursday into Friday with highs returning to near normal Friday.
Upper troughing then progged to gradually deepen over the area late Friday into Saturday as another short wave trough approaches CA.

AVIATION
VFR conditions over interior NorCal next 24 hrs. Local Sly sfc wind to 15 kts in Sac Vly with local gusts to 20 kts btwn 21z-04z, otherwise wind mainly below 12 kts in Central Vly. Vcnty of Delta, SWly sfc wind up to 17 kts with lcl gusts to 25 kts aft 21z Sat. Over hyr mtn trrn, lcl S-SW sfc wind gusts up to 25 kts.

STO WATCHES/WARNINGS/ADVISORIES
None.