How do tornadoes get bigger?
Hurricanes and cyclonesTornadoes: Formation, Speed & Effects
Prediction of tornadoes
Since tornadoes form within a few minutes, they can hardly be foreseen. Weather services keep an eye out for them with radars, satellites, weather balloons and computer models. Other warning signs are a dark, greenish sky, large hailstones and loud thunders.
If a tornado is seen on the radar, the authorities issue a warning. This cannot be compared with the predictions for tropical cyclones. For example, while the trajectory of a hurricane can be calculated several days in advance, the average warning time for a tornado is only 13 minutes.
When & where do tornadoes occur?
Tornadoes occur any time of the year, any time of the day, and around the world. Spring and summer are considered the high season, as these are ideal conditions for the formation of large thunderclouds.
Most tornadoes form in the United States because of climatic conditions. There are around 1,200 a year, mainly in Tornado Alley. The Midwestern area includes the states of Texas, Oklahoma, Kansas, and Nebraska. On average, tornadoes in the USA kill 80 people and injure more than 1,500 each year; The main cause are objects flying around.
They are also common in Argentina, South Africa, Japan and Australia. Around 330 are formed annually in Europe, most of them in northern France, the Benelux countries and in northwest Germany. In Germany the weather phenomenon occurs between 20 and 60 times a year.
Sources: Physik Journal, National Geographic, German Weather Service
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