Over the past few decades tornadoes have been shifting — decreasing in Oklahoma, Texas and Kansas but spinning up more in states along the Mississippi River and farther east. But scientists aren’t quite certain why.

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Terrifying EF4 tornado near Marquette, Kansas in 2012. Photo by Will Campbell/ NOAA via Wikipedia Commons

Tornado activity is increasing most in Mississippi, Arkansas, Tennessee, Louisiana, Alabama, Kentucky, Missouri, Illinois, Indiana, Wisconsin, Iowa and parts of Ohio and Michigan. There has been a slight decrease in the Great Plains, with the biggest drop in central and eastern Texas. Even with the decline, Texas still gets the most tornadoes of any state.

The shift could be deadly because the area with increasing tornado activity is bigger and home to more people. Also more people live in vulnerable mobile homes and tornadoes are more likely to happen at night in those places.

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The US tornado Alley shifts to the East. Via Nature

Even though Texas, Kansas and Oklahoma get many more tornadoes, the four deadliest states for tornadoes are Alabama, Missouri, Tennessee and Arkansas. More folks are generally at risk because of that eastward shift.

Because tornadoes sometimes go undercounted, especially in the past and in less populous areas, scientists don’t like to study trends by using counts of tornadoes. Now scientists prefer to focus on differences between wind speed and direction at different altitudes, how unstable the air is and humidity. The more of those three ingredients, the more likely tornadoes will form.

The study looked at changes since 1979. Everywhere east of the Mississippi, except the west coast of Florida, is seeing some increase in tornado activity. The biggest increase occurred in states bordering the Mississippi River.

Why is this happening?

We don’t know. But here’s my guess: As the Great Plains dry out, there’s less moisture to have the type of storms that spawn tornadoes. Tornadoes form along the “dry line” where there are more thunderstorms because there’s dry air to the west and moist air from the Gulf of Mexico to the east. That dry line is moving east.

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Nature – Spatial trends in United States tornado frequency
NOAA – Tornado fatalities per US States
WREG – Tornado activity increasing in Mid-South and scientists don’t know why

9 COMMENTS

  1. “That dry line is moving east.”

    I live in Alabama almost at the borderline of Mississippi. This year, we had moderate rain. It is not too wet and not too dry. Last year, we had crazy rain almost everyday. I just wanted to get out of this wet area to middle of desert. People told me that 2 years ago, it was complete drought. I can see the effect of the drought in that year even now. There is not much water in a lake. Tornadoes and hails are the constant threat around my area. But fortunately, I have not seen any tornado in my area.

    “tornadoes have been shifting” because the Earth itself has been shifting. North pole and South pole are shifting. Alabama and Mississippi will move their position from southeast to somewhere else.

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