It's like clockwork. Every winter we see news stories, usually from the right side of the media, questioning the legitimacy of global warming because the Midwest gets hit with a storm or it snows in Washington, DC. And every year the green bloggers respond (and sometime question the term "global warming" itself) and remind us that a storm does not make a season, and a season does not make the climate. Weather is not climate and climate is not weather.
Weather is short term- what is it going to be like outside in three days.
Climate is weather averaged out over a few decades.
They are two very different things and it's a fools game to try to blur the lines between them. We're on a warming curve, that's not really up for discussion by anyone with legitimacy. The science is there on that and it's solid.
It's fully within the realm of possibility to see out of wack weather events like this weeks snow in Vegas within the model of a warming climate. The trick is to not get caught up by the snow in front of your face but to step back and look at the big picture, a big picture where it snows in Las Vegas even as we continue to lose our polar ice caps.