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I heard an item on the radio where the twin twisters that clobbered a Nebraska community were said to be described by meteorologists as rare; the question "Is this due to climate change?" was also posed and left dangling. Investigating further at Google News, I found another item where a storm chaser was saying "I've never seen anything like this".
I then found an article by Andrew Freedman which says there's a wide range of tornado types and that storms which split aren't all that rare.
Pioneering tornado scientist Theodore Fujita, who devised the Fujita Tornado Damage Scale that is still used to classify tornado intensity, identified many types of tornadoes, some of which bore similarities to the twin twisters in Nebraska on Monday.
For example, the Palm Sunday tornado outbreak of 1965, during which nearly 50 tornadoes touched down and 271 people died, there was a well-documented dual tornado that struck close to Toledo, Ohio. A study Fujita published with his colleagues found that this tornado split for only a short time, coalescing back into a larger funnel soon after a famous picture was taken that bears some resemblance to the Pilger tornado.
"A single funnel split into two and then reorganized into one after about a minute," the study says.
Interesting reading.
(Score: 2) by dry on Friday June 20 2014, @03:47AM
Heard a meteorologist talking about the tornado in Ontario, rare but not unheard of, and she blamed it on a cold front, the same cold front that caused the twin tornadoes IIRC. So perhaps warming temperatures will mean less but I doubt it. More likely it'll just move them slightly north. For most places the climate change is very small and many of the effects that are blamed on it are just natural variation. Long term who knows, perhaps tornadoes will become common in the Northwest Territories where IIRC there is a lot of flat land.