Most observers agree that this spring's spate of killer tornadoes is highly unusual by statistical and historical standards. After that, the disagreement starts. Is it a fluke? -- or a sign of La Nina or climate change? Why haven't better warnings helped?

SEE ALSO:

"Explaining the Science of This Spring's Tornadoes" (Los Angeles Times) [2]

"The Facts (and Fiction) of Tornadoes" (New York Times) [3]

"Is Climate Change Playing a Role in Extreme Weather?" (CTV News)
[4]
"Missouri Tornado Whips Up Media Discussion of Climate Change And Extreme Weather" (Joseph Romm/Grist) [5]

"Joplin, Missouri, Tornado: Warnings Pale in Season of Violent Twisters" (Christian Science Monitor) [6]

"More Trauma in America's Tornado Hot Zone" (Dot Earth) [7]

"No Link Between Tornadoes And Climate Change: US" (AFP) [8]

"La Nina Weather Pattern May Be Factor in More Tornadoes" (Reuters)
[9]
"Finally, Something To Blame for the April 27 Storms" (Anniston Star)
[10]
"Climate Change Unlikely Factor in US Tornado Spree" (Forbes)
[11]
"What’s Causing the Tornado Tsunami" (Gregg Easterbrook)
[12]
"Are Tornadoes More Common Because of Climate Change?" (Guardian) [13]