Dinsmore, California – Heavy mountain snow will sweep across the interior mountains of Humboldt and Del Norte counties starting Monday night, with up to 20 inches possible and travel likely turning dangerous through Wednesday afternoon.
A Winter Storm Warning takes effect at 7 p.m. Monday and continues until 4 p.m. Wednesday for elevations above 2,000 feet. The warning covers the Del Norte Interior, Northern and Southern Humboldt Interior, including Highway 299 at Berry Summit, Highway 199 near Collier Tunnel, Bald Hills Road and communities such as Dinsmore.
Snow totals of 6 to 20 inches are possible, with the heaviest rates expected late Monday through Tuesday morning. Snow levels could briefly drop as low as 1,500 feet during peak intensity, allowing accumulating snow in lower foothill communities.
According to the National Weather Service in Eureka, travel could become very difficult to impossible across mountain passes. Tire chains may be required, and temporary road closures are possible if snowfall rates intensify.
Berry Summit along Highway 299 is particularly vulnerable to slick conditions and reduced visibility. Highway 199 near the Collier Tunnel could also see hazardous driving, especially during the Tuesday morning commute.
Residents in higher elevations should prepare for potential power disruptions and stock emergency supplies. Drivers should delay non-essential travel, carry chains, and check road conditions by calling 511 before departing.
Cold temperatures will follow the storm, increasing the risk of icy roads even after snowfall tapers Wednesday afternoon.
