Severe storms and tornadoes in the US Heartland: Links to broader climate patterns
Severe storms and tornadoes in the US are rising. Learn how climate change, jet streams, and warming air increase storm intensity and risk zones.
The central U.S., commonly referred to as Tornado Alley, is experiencing an increase in severe storms, including more powerful tornado outbreaks, and more frequent and intense occurrences of severe thunderstorms. Warmer air and other warming air masses, especially during spring months, are contributing to increased atmospheric instability that can result in supercell thunderstorms that can produce tornadoes.
Last several seasons have demonstrated a trend toward clusters of severe weather, rather than isolated severe weather events, along with an increase in the amount of wind, rainfall, and duration of storms. While these changes reflect a shift in the frequency of severe storms, they also reflect a shift in their overall structure and/or behavior.
How Climate Patterns Are Influencing Tornado Activity
While the formation of tornadoes is more complex than the impact of climate change on the atmosphere, the changing atmospheric conditions will influence the formation of severe storms. Consequently, if the average temperature in a given area increases, there will be an increase in the amount of moisture in the air. In addition, as the atmospheric jet stream pattern changes, wind speed will vary, and, therefore, wind shear will vary, both of which are critical factors in the formation of tornadoes.
In addition, El Niño and La Niña weather patterns alter storm tracks and seasonal weather patterns in the continental U.S. Thus, the result is a climate process in which the frequency of extreme weather conducive to producing severe storms continues, but the actual number of tornadoes in a given year can vary.
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Expanding Risk Zones and Preparedness Challenges
The geography has changed, with tornado activity growing west to east as it transitions across the Mississippi River Valley toward the southeastern portions of the country. New areas are now at increased risk from tornadoes.
Tornado preparedness poses significant challenges to communities experiencing these new risks because many of the physical and/or technical warning systems in these areas are not as robust as those in other parts of Tornado Alley. Communities should be prepared for the following changes in tornado activity:
- Unpredictable timing of storms
- Higher nighttime tornado risk
- Greater financial and infrastructure damage
Final Words
As mentioned above, the American heartland has transitioned from an area of seasonal thunderstorms to an area affected by the changing climate and weather patterns that accompany them. Understanding these linkages will not only improve the accuracy of forecasting, but will also provide supportive measures to build a stronger, more resilient community that can withstand and recover from an ever-changing and increasingly violent weather system.
FAQs
1. Are tornadoes becoming more common in the U.S.?
Not necessarily more frequent every year, but severe storm conditions are becoming more favorable.
2. How does climate change affect storms?
It increases heat and moisture in the atmosphere, which can intensify storms.
3. What is Tornado Alley?
A region in the central U.S. known for frequent tornado activity.
4. Are new areas at risk now?
Yes, tornado risk is expanding toward eastern parts of the U.S.
