The American Red Cross will open a shelter in Weymouth and stage personnel for two more shelters on Wednesday in advance of winter storm Toby, which is expected to impact much of the Commonwealth.

The nor’easter is forecast to bring snow and winds and the potential for coastal flooding to the Cape, Islands, and southeastern Massachusetts tomorrow. Much of the state is under a winter storm warning, with snowfall totals expected to be as deep as 12 inches in some parts of the state.

The shelter will be opened at the Weymouth Senior Center, 182 Green St., at 3 p.m. Wednesday.

Volunteers also will stage personnel and shelter supplies in Fall River and Mashpee so that they will be ready for storm response, if needed.

Visit redcross.org/get-help for the latest on shelters and other storm response information.