This blog will be issued every Monday, Wednesday, and Saturday morning and updated if the weather is changing or critical or interesting weather events are occurring.
A large low pressure area is off the Canadian Coast (see satellite picture below). This system will send another frontal system across the north state today with more rain and gusty south winds. Snow levels will be 5000 to 6000 feet north and a little higher to the south. The precipitation will turn to showers tonight and decrease. Sunday will start off partly cloudy to cloudy with isolated showers over the higher elevations. However, the low pressure area off the Canadian coast will act like a "pitching machine" and pickup the low pressure area shown on this morning's satellite picture in the Central Pacific (see black arrow) and shoot it eastward. The low will move through Northern California Sunday night and Monday with more moderate to heavy precipitation and gusty south winds. Snow levels will be 6000 feet or higher Sunday but will drop to 4000 to 5000 feet on Monday. The precipitation will turn to showers and decrease Monday afternoon and evening.
Tuesday the large low pressure area that is currently off the Canadian coast will reform back to the west (see map below). This will sag the jetstream southward in the Central Pacific and then run northeastward into Northern California. This weather pattern taps sub tropical moisture and results in warm...wet...storms hitting the north state. Tuesday through Thursday look for periods of rain...heavy at times...snow levels will be over 7000 feet. Gusty south to southwest winds are expected. The precipitation will turn to showers Friday and snow levels will drop to 3500 to 4500 feet.
Saturday high pressure will begin to rebuild along the coast and we will see clearing and drying.
The Old Forecaster