Well, first off, a bit of a clarification. Sandy was NOT a hurricane when it made landfall. The system went extra-tropical or non-tropical or cold-core (however you want to say it) just prior to making landfall in NJ. Because the point of landfall was so quickly followed after the transition, some of the eyewall features from the tropical component of the storm were still there. I think this is what makes this such an interesting storm to look at, because of all the different components it had to it. Oh, and by the way, a hurricane is a storm by definition.
With that out of the way, the question as to if the storms of this magnitude will be more common place due to climate change begs one to admit that some sort of unusual climate change is a fact. That is a whole other topic, perhaps for next spring- when we all have more time! Anyway, I guess my answer would be I do not see any trend towards these types of super storms over the past 20-20 years. If you go back in time over the past 50-100 years, you will find other super storms that have impacted areas of the US. Not exactly like this one did, Sandy was unique in many ways, but storms that would be classified "super storms".
I think the main thing that is happening is that as our population grows, so does the impact that weather has on the population. Look back at our coastlines 40-50 years ago and there was nowhere near the development along them as there is now. I am not saying that folks are purposely putting themselves in harms way, just saying that living on this planet puts us all at risk from one kind of weather event or another and coastlines present a host of weather related risks. So the more folks that live along the coasts, the more that will be at an enhanced risk.
However, it is not just the coastlines. Urban areas continue to grow in the heartland, many of these urban centers are in what is referred to as "Tornado Ally". As these cities grow in size, it increases the odds that they will be hit by a major tornado and reap the destruction from them. Development in earthquake prone areas is also very large and one of these days the "Big One" will hit and cause destruction beyond most folks imagination.
I know that after the devastating tropical season of 2005 (Katrina, Rita, Dennis) the media were having "experts" out there saying that years like that were going to become the new "normal". That year saw 31 named storms, 7 of which had a US landfall. Since then the number of named storms have gone like this:
Year
| # of Storms
| # of US Landfalls
|
2006
| 9
| 2
|
2007
| 17
| 3
|
2008
| 17
| 6
|
2009
| 11
| 2
|
2010
| 21
| 1
|
2011
| 19
| 3
|
2012
| 19
| 4
|
Long Term Average
| 11.3
| 2.1
|
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These years are all above the long term averages of 11.3 named storms per year, but nothing like what happened in 2005.
So I think the bottom line is that we are most likely not seeing an increase in "super storm" activity, it is just that their effects are being felt more by humans and the media is covering them more. Just my 2 cents.
-John