In Buffalo, where at least 18 people have died, the two largest supermarket chains have been closed since Friday as the latest forecast called for another 6 to 12 inches of snow.It’s whatever you can grab,” said Scott McCandless, 54, who lives in Orchard Park, a suburb southeast of Buffalo.On Monday, snow continued to blanket Erie County, leaving roads in many areas impassable, including the majority of Buffalo, County Executive Mark Poloncarz said at a news conference.Poloncarz said he hoped some of the suburbs would be able to lift driving bans Tuesday, allowing Tops Friendly Markets and Wegmans Food Markets to resume business.In the meantime, Poloncarz said supermarkets have been allowed to get replacement shipments while officials were coordinating food transports to shelters, emergency responders and people stuck inside who may be running out of food."