IMPACT DAY: Heavy Rain and Gusty Winds in Northern California

Heavy rain and breezy conditions are expected today, with the heaviest rain expected in the Foothills and the strongest winds in the Sierra. More active weather is forecast over the coming days.

Updated: 7:24 AM PST Dec 21, 2025

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Current Conditions & Forecast

Sunday and Monday are IMPACT DAYS across Northern California. A potent atmospheric river is bringing notable precipitation and strong winds to the region. This system poses risks of flooding, downed trees, and hazardous travel conditions.

Rainfall Totals

• Foothills: Expect the heaviest rainfall, with potential for 3-6 inches in some areas.
• Valley: 1-3 inches of rain are likely.
• Sierra Nevada: Heavy snow is expected at higher elevations,with potential for blizzard conditions.

wind Gusts

Strong winds will accompany the rain, especially in the Sierra Nevada. gusts could reach up to 70 mph, creating dangerous conditions for travel and potentially causing power outages.

Potential Impacts

This storm system presents several potential hazards:

• Flooding: Rapidly rising rivers and streams are possible, especially in areas with saturated ground.
• Landslides & Mudslides: Steep terrain is vulnerable to landslides and mudslides.
• Downed Trees & Power Outages: Strong winds can topple trees and disrupt power lines.
• Hazardous Travel: Reduced visibility and slick roads will make travel dangerous.

Safety Precautions

Here are some steps you can take to stay safe during this storm:

• Avoid needless travel: If possible, stay off the roads during the peak of the storm.
• Monitor conditions: Stay informed about the latest forecasts and warnings from the National Weather Service.
• Prepare for power outages: Have flashlights, batteries, and a backup power source readily available.
• Clear gutters and drains: Prevent water from backing up around your home.
• Be aware of your surroundings: Watch for falling trees and debris.

looking Ahead

Additional storms are forecast to impact northern California throughout the week. Residents should remain vigilant and prepared for continued wet and windy conditions. We will continue to provide updates as the situation evolves.

Key Takeaways

• A significant atmospheric river is impacting Northern California.
• Heavy rain and strong winds are expected, particularly in the Foothills and Sierra Nevada.
• Flooding, landslides, and power outages are potential hazards.
• Take necessary safety precautions and stay informed.