You're going to want your umbrella today, and should prepare yourself for severe winter weather on the way this week. We're tracking scattered showers across Northern California for the start of your Tuesday, with heavier rain and snow moving into our area tonight. Snow levels are down to as low as 4000' in some areas this morning, but are expected to lift to around 5000' to 5500' by tonight. Temperatures have dipped into the mid to high 40's in the valley overnight, and are starting out in the 20's to 30's in the mountains this morning. Winds will be out of the Southeast to around 10mph this afternoon. High temperatures are only projected to climb into the low to mid 50's in the valley, and into the low to mid 40's in the mountains. A Winter Weather Advisory will go into effect at 4pm this afternoon, and stay in place until 4pm Wednesday for portions of the Sierra above 5000'.
Moderate rain and snow are expected to continue through Wednesday afternoon. The next stronger system ramping up in the Pacific is expected to start to impact Northern California on Wednesday afternoon, and will bring heavier precipitation and gusty South winds to our region. The Winter Weather Advisory will be replace with a Winter Storm Watch at 4pm on Wednesday. That is a significant upgrade for the warning, and indicates that much heavier rain and snow are expected for Wednesday night through Thursday. That warning will stay in effect through Thursday night. A High Wind Watch will go into effect across the valley and Sierra on Wednesday afternoon, and will stay in place through Wednesday night. Winds are expected to gust up to 65mph out of the South in some areas, and will be strong across the majority of Northern California. Gusty winds could knock trees into power lines causing power outages, or knock trees into roads causing travel impacts. The active weather will make mountain travel treacherous from late Wednesday through Thursday, and drivers are encouraged to avoid mountain travel during that time if possible. A Flood Watch will also be in effect from Wednesday night through Thursday morning for the valley and foothills. Debris flows and mud slides will be possible along recent burn scars as the heavy rain moves through. Looks like we'll mostly dry out by Friday, and stay dry on Saturday. Another wet system is projected to arrive in Northern California on Sunday and could potentially last into Monday of next week.