Causes of hurricanes in the United States

The reasons for the formation of hurricanes in the United States are as follows:

The United States is bounded by the Atlantic Ocean to the east, the Pacific Ocean to the west, and the Gulf of Mexico to the south. A large amount of water vapor flows to the continent from the east, west, and south. Too much water vapor can easily lead to thunderclouds. In addition, the United States is mainly located in mid-latitudes and is often controlled by subtropical high pressure in spring and summer. Therefore, warm and moist air from the Atlantic Ocean, Pacific Ocean and Gulf of Mexico will be continuously transported to the continental United States, and thunderstorm clouds will accumulate more and more. The presence of many thunderclouds is one of the conditions for producing tornadoes, which is why tornadoes in the United States often occur in spring.

The peak season for tornadoes is generally from April to June every year. Starting in June, a large amount of warm and humid air moves northward to Kansas, Nebraska, and Iowa, and then to Canada in July. Since then, the number of tornadoes in the United States has decreased significantly.

For a tornado to form, cold air must be on top of warm, moist air, and the wind should move in different directions at different heights to create shear. These forces combine to form a strong air current, which is particularly noticeable as it crosses the Rocky Mountains from the west or southwest.

Strong air currents sink across the southwestern United States and turn south, eventually sending a series of storms to several southern states for several weeks. This situation has only happened two or three times in 100 years. According to some news, the number of tornadoes has been increasing in the past few decades. As the global climate warms, many conditions favorable to the generation of tornadoes will be produced.