I've lived in ski resorts and never had a problem with winter tyres on or chains with summer tyres before fitting the winters.
Why do you think its law in Scandinavia and some Euro countries to fit winter tyres on from late November. They work. Softer compound which work below 4 degrees and tread paterns to dig into the snow and ice. If your running stock RFT's in these recent conditions you can expect problems.
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