November 3, 2021 – Patchy fog this morning then another weather system will bring light to moderate amounts of precipitation for tonight and Thursday. More rain is expected for parts of the region this weekend with a stronger system due to impact the entire region early next week.
Discussion
Have continued a mention of some patchy fog this morning in the valley and for some of the mountain valleys with. The clear skies and light winds in place should help to produce some patches this morning. Tonight and Thursday another weak system will move through the region with low impacts.
Snow levels will be high and generally above pass levels. Precipitation amounts will range in the valley to up to half an inch near Redding with amounts dropping off in the valley to a tenth of an inch or less from around Sacramento south.
Foothills and mountains will generally range between a quarter of an inch to three quarters with local higher amounts over Western Shasta county. Amounts will rapidly drop off south of US-50. Dry zonal flow will set up Thursday night and Friday.
Another very weak system will pass through the region late Friday night and Saturday bringing only light amounts of precipitation to parts of the region.
Snow levels will continue to be high but may lower to around pass levels along I-80 to bring minimal amounts of snowfall. This system will be weaker than the previous two and any valley precipitation looks to remain north of the Sacramento region but may bring some mountain showers as far south as I-80.
Extended Discussion (Sunday through Wednesday)
Sunday should be mostly dry but the NBM is still trying to bring some light overrunning of precipitation to the north. It did at least lower the pops considering both European and GFS are indicating a ridge over the region.
On Monday a deeper stronger trough will be approaching the area and continues to look like it may bring us a decent atmospheric river to Northern California that will impact the region for mainly late Monday into early Wednesday.
Snow levels should remain high for the start of the event but will be lowering Monday night to around major pass levels then lowering some more on Tuesday. This should bring some significant snow below major trans-sierra pass levels.
This system still looks decent but not as strong as a day ago. Breezy to windy conditions also look possible along with some heavy rain as the system passes the area.