A weak cold front is moving southeast through the viewing area this evening. Rain will fall overnight in all areas with widespread coverage becoming more showery after midnight. Snow levels are currently around 6,000′ to 7,000′. After midnight they will drop to about 4,500′ to the east of the Cascades. In Siskiyou County they will drop to about 6,000′, but should be around 4,500′ feet as well. It’s possible some snow showers bring an inch to Mt. Shasta and 2″ to the Cascades and higher elevations of the Basin, as the snow levels continue lowering through the morning.
Very light and isolated showers are possible tomorrow morning. By midday the system will be well to our East and drier air will filter in. At this point a weak high pressure ridge will build into the forecast area into tomorrow through Monday evening so decreasing clouds are expected for all areas. Sunday evening temperatures will be on the cooler side once again, so I wouldn’t be surprised if the NWS issues a Frost Advisory for Coastal sections.
Monday itself, however, will warm up nicely. It will also be the last day of spring like temperatures with a moderately strong cold front moving in from the West. This system will bring in a much cooler air mass, specifically to the higher elevations. Snow levels will drop significantly with the front’s passing. Increasing clouds & winds, as well as precipitation will begin Monday evening but the front moves through rather slowly and by Tuesday evening the next disturbance is right on it’s heels. Heavy rain will fall along the Coast and in Siskiyou County through Tuesday evening and moderate rain further inland. Winds will pick up along the Coast, ridges, Shasta Valley and East Side. Gusts could reach 40mph.
The heaviest precipitation will be in Siskiyou County and there is concern that Siskiyou Summit will see travel impacts once snow levels continue to drop through Tuesday & Wednesday. By Thursday morning they will be down to about 3,000′-3,500.’ Showers are going to continue through this time as another shortwave moves through; this is when the coldest air will be in place. With moisture still present, snow is certainly possible. Through this time period, Monday evening through Thursday morning, snow in the Siskiyous and Mt. Shasta could easily accumulate. A good 6″-10″ could fall here, with 3″-6″ possible in the Cascades. Slightly lower accumulations are possible in the higher elevations of the Basin.
These accumulations are subject to change within the next 48 hours, so stay tuned to NewsWatch12. I’ll continue to bring updates on Facebook!