Check maps that show the average number of tornadoes in each of the United States over a year or by month, based on tornado observations from Storm spotters have been trained to recognize tornado conditions and report what they see to the National Weather Service.
Storm spotters can be emergency managers or even local people with a keen interest in severe weather who have taken formal storm spotter training in their community. Additionally, computer programs, called algorithms, analyze Doppler radar data and display it in ways that make it easier for forecasters to identify dangerous weather. A storm with a tornado observed by radar has certain distinguishing features and forecasters are trained to recognize them. Click the name of any month below the main graphic to see the average number of tornadoes in each state by month.
Where do these data come from? Additional information on tornadoes: Recent Tornado Reports and Information A summary of recent tornadic activity in the contiguous United States, including monthly tornado counts and descriptions of significant events.
Historical Records and Trends Historical records and trends for tornadoes, including graphs and maps showing timing and occurrences over approximately 60 years.
Tornado Alley In the United States, there are two regions with a disproportionately high frequency of tornadoes. From to , the US averaged a preliminary total of 1, tornadoes per year, and Europe around However, Dr.
European Russia which is the part of the country west of 58 degrees East longitude , tops the list at 86 tornadoes annually.
Germany comes in second with an average 28 tornadoes annually. The peak density of tornado reports coincides with the high population density over Belgium, the Netherlands, and northern Germany, according to a study on severe storms in Europe published in December The study also reports that thunderstorms are twice as frequent over the United States, with as many as four times more storm reports, compared to Europe.
One thing most countries have in common is the time of day that tornadoes occur, which is most frequently during the afternoon and early evening. But the peak season is not the same. In the US, spring is the peak for tornado activity. For central and northern Europe the main tornado season is in summer, whereas it is autumn for the western and central Mediterranean region, and winter in the eastern Mediterranean.
Outside of the US, Canada actually ranks second on the list for most tornadoes, with an average of per year. Tornadoes are not limited to the Northern Hemisphere. Australia has dozens every year, and South Africa also reports annual occurrences. South America, much like other continents, has its own tornado hotspot, known as "pasillo de los tornados. On average, around seven to 10 moderate to strong tornado events are reported in New Zealand every year. Southern Hemisphere tornadoes typically rotate clockwise, which is the opposite of how tornadoes primarily spin in the Northern Hemisphere.
Here's why the US has more tornadoes than any other country. Posted: Mar 7, PM. Within the US, every state has had at least one tornado, and some have dozens each year. Scroll for more content Oregon Coronavirus Cases. There are often tornadoes all over the place, just not many in one spot. They all see four or more tornadoes when their numbers are rounded. September features 66 tornadoes on average, usually continuing the August deflation.
It also shows the beginning of a southward constriction back toward the Gulf warmth headed to winter. The top five states for September tornadoes all see four or more when their averages are rounded. Tornadoes continue to wane into October, but much of the nation has still been impacted during the month. There are 58 tornadoes in October on average, and the Plains into the South become a favored zone once again. Each sees three of more tornadoes on average.
Rounded up, Mississippi, Kansas, and Nebraska also reach that mark. Although the average count drops to 56 tornadoes across the country in November , numbers go up across the south from October. They all tend to see four or more during the month. This is not a month to sleep on, as sadly reminded us. Even in the quietest time of the tornado year, five states see three or more tornadoes in your average December: Texas, Mississippi, Louisiana, Alabama, and Georgia.
The tornado year features four months with over tornadoes on average, running April through July. While the typical tornado season is often thought of as the peak months of April through June, most months have featured significant tornado events at one time or another.
By meteorological season, roughly 8 percent of tornadoes occur during winter, 43 percent in spring, 35 percent in summer, and 15 percent in fall. During winter, tornadoes tend to reside near the relative warmth of the Gulf of Mexico. They also like California from winter into spring as storms push ashore from the Pacific.
Roughly from March through July, tornadoes slowly march northwest with the jet stream.
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