Is the weather really becoming more volatile?

In a story about Scientists warn California could be struck by winter 'superstorm,' I read this "interesting" line:

The risk is gathering momentum now, scientists say, due to rising temperatures in the atmosphere, which has generally made weather patterns more volatile.

Has anybody seen a study verifying that weather patterns have become more volatile? How does one even measure weather volatility?

As I'm sure you guessed, I am skeptical of this claim. But if there is any evidence to it, I'd sure be interested in seeing it. (Please post links in the comments to any studies.)

Way back when people were talking about Global Warming, that is before it became Global Climate Change, which was before it was called Global Climate Chaos, I predicted that Global Warming would be renamed Global Climate Volatility. Now, I see this is true, though they have not yet adopted my name for it.

To return to the article:

The threat of a cataclysmic California storm has been dormant for the past 150 years. Geological Survey director Marcia K. McNutt told the New York Times that a 300-mile stretch of the Central Valley was inundated from 1861-62. The floods were so bad that the state capital had to be moved to San Francisco, and Governor Leland Stanford had to take a rowboat to his own inauguration, the report notes. Even larger storms happened in past centuries, over the dates 212, 440, 603, 1029, 1418, and 1605, according to geological evidence.

So this "cataclysmic" event has happened many times before. But remember, next time it occurs, it surely was caused by Global Climate Volatility.