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Short Answer: The number of tornadoes is expected to decrease as summer begins.Ĭarbin: 'In the summer months we often see a lot of thunderstorms in many areas of the country, but we also tend to lose the wind shear that's necessary for organized severe weather.

We know that there are ingredients that thunderstorms need that could increase in a warmer world, but we also know there are ingredients that may decrease, so the connections if any are very tenuous and the scientific discoveries on this have yet to be made.'

it's an unanswered question, essentially. There is evidence that suggests both yes and no.Ĭarbin: 'With respect to a connection to climate change. So right now, no indication of an upward trend in the strong to violent tornadoes that we're seeing.'Īre strong tornadoes a result of global warming? It's just that these things are coming, and they're very rare and extreme, and they happen to be hitting populated areas. When you take out the F-0 tornadoes from the long-term record, there is very little increase in the total number of tornadoes, and we don't see any increase in the number of violent tornadoes. We've had a lot more reports of tornadoes, but most of those tornadoes are actually the weak tornadoes, the F-0. Short Answer: No, the tornadoes are just hitting populated areas.Ĭarbin: 'There is no indication of an upward trend in either intensity or numbers. Have there been more tornadoes in 2011 than previous years? So there have been many years in the past over the past couple of generations in which we've exceeded 500 fatalities in a year, it's just that they haven't occurred recently.' That is something we have not experienced in this country in over 35 years and it still looks like we're still around the number nine as far as the deadliest year on record.

We're now approaching about 500 fatalities for the year to date, just under that. The average killer tornado claims about two lives and so what's going on this year is something well above that. Meteorologist Greg Carbin: 'In the past decade the average annual death toll from tornadoes has been around 60 to 70 people. The average death toll is normally 60 to 70. Is the death toll in 2011 significantly higher than previous years?

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