Why are severe weather often accompanied by strong winds?

Because strong winds often cause bad weather. In tropical oceans, seawater easily evaporates into water vapor after being exposed to direct sunlight. This gas expands due to high temperature, resulting in reduced density and mass. The wind near the equator is weak, so it is easy to rise and cause convection. At the same time, the surrounding The colder air flows in to supplement it, and then rises again. In this cycle, the entire air column is filled with air with higher temperature, lighter weight and less density. This forms the so-called "tropical low pressure".

And the air flows from high pressure to low pressure, and the air in the surrounding areas with higher pressure flows to the areas with lower pressure, thus forming wind.

The rotation and revolution of the earth form distinct seasons, day and night, and the formation of typhoons is also related to this. As the earth rotates, the direct point of the sun moves toward the northern hemisphere through the equator in summer. At this time, the southeast trade winds on the oceans in the southern hemisphere will also cross the equator and become the southwest monsoon winds in the northern hemisphere. When the southwest monsoon meets the northeast trade winds that are already active in the northern hemisphere, it will increase air convection, causing fluctuations and vortices. When the convection in the air becomes stronger and stronger, the vortex continues to deepen, the surrounding air flows faster, and the wind becomes stronger and stronger. When the wind speed reaches or exceeds 17.2 meters per second, a typhoon forms.

Simply speaking, the conditions for the formation of typhoons include the following four points: Natural conditions must have a sufficiently broad tropical ocean surface. The surface temperature of sea water is higher than 26.5 degrees Celsius, and the depth of sea water on the ocean surface must be at least 60 meters. There must be a tropical vortex. There must be a large enough deflection force of the earth's rotation. Before the formation of a typhoon, the difference in wind direction and speed between high and low spaces is small.

A tornado is a vortex with extremely strong winds but not a large scope. It is shaped like a funnel, has extremely fast wind speed and is very destructive. The air pressure at its center can be ten percent lower than the surrounding air pressure. Tornadoes appear and disappear very suddenly, making effective forecasting difficult. The survival time of a tornado is generally only a few minutes, and the longest is no more than a few hours. Where tornadoes pass through, they often uproot trees, overturn vehicles, and destroy buildings. Sometimes they suck people away, causing serious harm. Tornadoes form due to instabilities producing strong updrafts, which are further intensified due to the influence of maximum passing air currents in the jet stream. Due to interaction with winds shearing in both speed and direction in the vertical direction, the updraft begins to rotate in the middle of the troposphere, forming a mesoscale cyclone.