Well evidence that the climate is changing can only be cumulative. If records get broken at an ever-increasing rate, or drought occurs at much more frequent intervals or becomes more severe over decades, or floods occur far more frequently than in the past, or the frequency or severity of tropical storms show long-term increases, that's evidence. One massive snowstorm on its own is evidence that you've just had snow. Unprecedented snowstorms over about ten winters in your region could be evidence for climate change. It's quite interesting to read about the fairly dramatic and sudden change in climate in the southern part of Western Australia, most of the changes happening in the last forty or fifty years. It that permanent or just a glitch? There will never be an end-point at which we can be certain one way or the other, but the evidence there, and in many parts of the world, is accumulating. Anyway, we're getting your snowstorm on Wednesday you'll be pleased to hear, but by then it will be just a bit windy and pissing down.