A historic, record-deep marine layer is trapping an unseasonably cold air mass. Light rain is approaching and will arrive by Wednesday morning, bringing pre-frontal coastal drizzle. This rain will push inland overnight and affect the North Bay by morning.

A secondary weather disturbance is expected to hit the coast from the northwest on Wednesday night, increasing the potential for light rain across the broader area by Thursday morning. Projected rainfall totals vary, with the highest terrain seeing the most rain.

Further details on the projected rainfall totals and the weather system are available, including specific amounts expected for various regions, such as the North Bay Coastal Ranges and the Santa Rosa and Sonoma Valleys.