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The tornado corridor moves east in the United States, reducing records in traditional areas and increasing risks in more populated, vulnerable, and less prepared regions for severe storms
The tornado corridor in the United States is shifting eastward, reducing records in traditional areas like Texas and Oklahoma and raising the risk in southeastern states, where preparation is lower.
The classic map is becoming outdated
For decades, the area known as Tornado Alley concentrated the highest risk of tornadoes in the United States.
This region of the Great Plains had ideal atmospheric conditions for severe storms and extreme phenomena.
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The classic model relied on the meeting of warm, moist air from the Gulf of Mexico, cold, dry air from Canada, and warm, dry air from the southwest.
This clash of air masses created an unstable atmosphere capable of favoring supercells, giant hail, and catastrophic tornadoes.
Texas, Oklahoma, and Kansas were marked as epicenters of these events for many years.
Now, meteorologists and storm chasers point out that this pattern is losing strength. The tornado corridor no longer concentrates only where it always has, and the change alters the understanding of risk.
Fewer tornadoes in traditional areas
Recent studies indicate a reduction in activity in parts of the classic core. Areas like Texas and Oklahoma are recording fewer days with tornadoes, within a trend observed over the past few decades.
Cities like Dallas and Austin have also shown a decline in the number of tornado days per decade. These records reinforce the view that activity is no longer concentrated in the old central areas.
The change is occurring quietly, but it has significant implications for meteorology. The old risk map, used for generations to represent Tornado Alley, is becoming less accurate.
This does not mean that the plains are no longer dangerous. The difference is that the center of tornado activity has begun to move to regions further east, shifting the main focus.
New focus moves to the southeast
The increase in activity is evident in states like Tennessee, Kentucky, Alabama, Mississippi, and Arkansas. This new area has been treated by experts as a space of increasing risk.
Records show that the center of tornado activity has moved from areas west of the Mississippi River and is now concentrating more to the east. This shift changes the monitoring of severe storms.
The tornado corridor is no longer just an image associated with the Great Plains and now involves regions with different social characteristics. The problem, therefore, is not just meteorological.
The affected areas have higher population density, more vulnerable housing, and less prevention culture. Therefore, even without a significant increase in the total number of tornadoes, the potential for impact grows.
Why the risk is changing
The meteorological explanation involves changes in the distribution of air masses. The Gulf of Mexico is bringing increasingly warm and moist air eastward, increasing the energy available for storms.
In the Great Plains, drier episodes reduce the frequency of conditions favorable for tornado formation.
At the same time, changes in atmospheric circulation influence the position of severe storms.
The shift of the jet stream and low-pressure systems also interferes with this pattern. These factors help explain why the risk migrates gradually.
Consequences for the population
The main concern is the practical impact. Regions less accustomed to tornadoes may face difficulties in responding, especially when there are vulnerable homes and less community preparedness.
The new tornado corridor shows that the climate does not remain fixed. A zone that was once well-defined is undergoing transformation, bringing risks to places where prevention has not yet kept pace with the threat, in a more vulnerable scenario.
With information from Tempo.
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