By Paul Homewood
2017 was a relatively busy year for tornadoes in the US, ranking third since 2005 on preliminary data.
This was mainly due to a spurt in numbers in January to March, most of which were weak EF-0 and EF-1 tornadoes. There were though three EF-3s in an outbreak in January, which sadly led to 20 fatalities.
As for longer term trends, regular readers will recall that we need to discount weaker tornadoes, as NOAA explain:
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