A low will enter northern California to Washington today and into Wednesday.
Rain is expected for coastal areas and snow will fall over the Olympic Mountains, Cascade Mountains, and parts of the northern Rockies.
Along the coast of Washington and Oregon rainfall amounts up to three inches are possible. Meanwhile, 6 to 12 inches of snow is expected in mountainous regions.
Light snow is expected on Wednesday across the northern Plains, snow will shift to the central Plains on Wednesday afternoon.