Experts say a natural La Nina weather pattern, unusually warm moist air juiced by climate change, and long-term shift in where tornadoes hit all are factors in Thursday's devastating tornado in Alabama
And it may be the start of a bad tornado year, one expert worries.
which is a natural cooling of parts of the Pacific that changes weather worldwide, dissipates like it is forecast to do in a few months.For tornadoes to form, two big ingredients are needed that often aren’t at high enough levels at the same time: wet stormy instability and wind shear, which is a difference in wind speeds and directions at different altitudes.
“If you’re going to get tornadoes in January, this is the type of setup that’s going to produce them,” Gensini said.Measurements of moisture in the Alabama air were about twice as high as they should be this time of year and more like May in Tornado Alley, an area stretching from Texas to South Dakota known for being prone to twisters, Gensini said. That’s more than enough for a tornado.
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