I am scheduled to be on the PBS Newshour tonight on Sandy.
Satellite image of Superstorm Sandy taken at 10 am EDT Tuesday. Image NASA GSFC via Masters.
Climate science explains how global warming can make a superstorms like Sandy more destructive in several ways:
- Warming-driven sea level rise makes storm surges more destructive. In fact, a recent study found “The sea level on a stretch of the US Atlantic coast that features the cities of New York, Norfolk and Boston is rising up to four times faster than the global average.”
- “Owing to higher SSTs [sea surface temperatures] from human activities, the increased water vapor in the atmosphere leads to 5 to 10% more rainfall and increases the risk of flooding,” as Kevin Trenberth explained to me in a 2011 email about Hurricane Irene. He elaborates on that point for Sandy here and for all superstorms in this article.
- “However, because water vapor and higher ocean temperatures help fuel the storm, it is likely to be more intense and bigger as well,” Trenberth added (see another of his articles here). Relatedly, warming also extends the range of warm SSTs, which can help sustain the strength of a hurricane as it steers on a northerly track into cooler water (much as apparently happened for Irene). September had the second highest global ocean temperatures on record and the Eastern seaboard was 5°F warmer than average (with global warming responsible for about 1°F of that).
- The unusual path of the storm — into the heavily populated east coast rather than out to see — was caused by a very strong blocking high pressure system that recent studies have linked to warming. Meteorologist and former Hurricane Hunter Jeff Masters has an excellent analysis of this, “Why did Hurricane Sandy take such an unusual track into New Jersey?“
I have put these in order from most scientific certainty to least. The first two — the impact of sea level rise and increased water vapor — are unequivocal. The third is extremely likely. The fourth is more speculative.
Remember, climate scientists and others have for quite some time been warning New York City that climate change was dramatically increasing the odds of a devastating storm surge — see Greg Laden’s post, “Peer Reviewed Research Predicted NYC Subway Flooding by #Sandy.” See also today’s NY Times story, “For Years, Warnings That It Could Happen Here.” Also a brand new study of storm surges since 1923 finds “that Katrina-magnitude events have been twice as frequent in warm years compared with cold years” — so more severe surges are on the way.
And that’s the other key reason we must make the connection to climate change: Scientists worst-case scenarios are already happening — so their latest findings deserve attention so that Sandy doesn’t become just another Cassandra whose warnings are ignored. Now climate scientists project that we risk up to 10 times as much warming this century as in the last 50 years — with many devastating consequences from dramatic sea level rise to Dust-Bowlification (see my review of more than 60 recent studies).
That means the 4 factors described above are going to have a greater and greater impact over time. That’s one of the many, many reasons we must act to reduce emissions ASAP, so we don’t keep getting “new normals” that ultimately make Sandy and Irene seem tame.
The media coverage of the link between Sandy and climate change started (too) slowly, as Climate Progress reported, but has vastly improved. NBC News in particular had a great story with Trenberth that touched on the points above.
Unfortunately, while more of the media are getting the story right, some are still not.

by Katie Valentine
Coverage of climate change from television news outlets has dropped precipitously since 2009. And during the lead-up and arrival of Superstorm Sandy, the climate connection to extreme weather was 
by Mike Casey, via
Most television news outlets have given 
by Bill Becker
In a recent interview with MTV, President Obama
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by Bob Berwyn, via
by Daphne Wysham
by Jackie Weidman
The Federal Emergency Management Agency has a $14.3 billion budget to coordinate the national response to disaster situations like Hurricane Sandy. Should the sequester take effect, the White House estimates that the agency would lose about $878 million, largely from programs that provide direct relief to disaster victims. [
Hurricane Sandy’s assault on the Eastern United States should remind us that this could happen again. We rightly grieve for the storm’s victims and, if past is prologue, will generously contribute to helping them get back on their feet. This very American concern for suffering can also be motivator for working to prevent these sorts of storms in the future — that is, working to limit change as quickly as possible.
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Michigan is playing host to a major battle over renewable energy this fall. On one side are clean energy proponents promoting a ballot initiative that would increase the state’s renewable electricity targets to 25 percent by 2025. On the other side are large coal-dependent utilities
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