Snow tire = winter tire
winter tires have totally different tread, a larger, deeper highly detailed tread with small spikes designed to give the traction necessary to most handle winter driving conditions without hydroplaing, and they dont destroy the road as chains would.
all-season (Used by most vehicals) designs won't be able to match a quality winter tire on snow and ice. even with chains which maybe illegal in some areas
visit some US tire manufactures website or ask when you find a car over there.
www.yokohamatire.com/searchresults.asp?id=s
www.bridgestonetire.com/dpp/
& Michelin or Goodyear
have fun in California