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On April 14, a massive storm swept down out of the Rocky Mountains into the Midwest and South, spawning more than 150 tornadoes that killed 43 people across 16 states (Capital Weather Gang, 4/18/11). It was one of the largest weather catastrophes in United States history-but was soon upstaged by an even larger storm, the 2011 Super Outbreak that spread more than 300 tornadoes across 14 states from April 25 to 28 (including an all-time one-day record of 188 twisters on April 27), killing 339 people, including 41 in Tuscaloosa, Alabama (CNN, 5/1/11).

It was an unprecedented string of severe weather: By mid-June, more than 1,000 tornadoes had killed 536 people (NOAA, 6/13/11), nearly as many deaths as in the entire preceding decade. And it was only natural to ask: Were we seeing the effects of climate change?

Most scientists would say yes, or at least “probably.” The Intergovernment Panel on Climate Change, a global scientific body that has been a target of conservatives despite a record of soft-pedaling its findings to avoid controversy (Extra!, 7/8/07), warned on February 2, 2007, “It is very likely that hot extremes, heat waves and heavy precipitation events will continue to become more frequent.” (In science-speak, “very likely” refers to a certainty of greater than 90 percent, and is as near as you get to a definitive conclusion.) Other forecasts (e.g., Environment America, 9/8/10) have projected that wet regions will receive record rainfall thanks to increasing evaporation, while dry ones get record drought, as climate patterns shift to accommodate the new normal.

Yet despite these dire predictions, U.S. media were hesitant to investigate the links between climate change and this spring’s extreme weather. Much coverage settled for the cheap irony of contrasting extreme phenomena, as when NBC’s Saturday Today show meteorologist Bill Karins (6/11/11) quipped:

Feast or famine’s been the rule this spring. The northern half of the country, we’ve dealt with the heavy rain, the record snow pack that’s now melting in the northern Rockies. That’s causing the flooding. The southern half of the country, you would love some of that rain.