Thunderstorms are among the most dramatic phenomena in nature. Before heavy rain begins, we may see enormous cumulonimbus clouds, flashes of lightning, and hear the powerful sound of thunder.
اضافة اعلان
These phenomena are closely connected and are part of a dynamic atmospheric system.
Lightning is a gigantic electrical discharge that can occur within a cloud, between clouds, or between a cloud and the ground. The air in the lightning channel is heated extremely rapidly, reaching temperatures of about 30,000°C. This sudden heating causes the surrounding air to expand explosively.
When the air expands so rapidly, it produces a sudden change in air pressure. The surrounding air then moves rapidly toward and through the disturbed region, as the atmosphere acts to restore pressure balance. In this sense, nature does not tolerate a lasting vacuum: air immediately moves into regions of lower pressure.
The rapid movement and pressure disturbance produce the powerful sound that we call thunder. We see the lightning before hearing the thunder because light travels much faster than sound.
The same storm system is also responsible for the formation of rainfall. Warm, moist air rises inside the cumulonimbus cloud. As it rises, it cools, and the water vapor it carries begins to condense into tiny water droplets and ice crystals. Strong upward and downward currents within the cloud cause these particles to collide and grow.
As the droplets and ice particles become larger and heavier, gravity eventually overcomes the upward air currents, and they fall toward the ground as rain, hail, or other forms of precipitation.
From my observations of nature, a thunderstorm can therefore be understood as a connected sequence of atmospheric processes: moist air rises, water vapor condenses, electrical charges separate, lightning occurs, the surrounding air expands and moves rapidly, thunder is produced, and precipitation falls from the cloud.
People living in the Jordanian countryside and Badia have long observed these signs of approaching storms. Bedouins, through generations of experience, learned to watch the movement of clouds and storms and to move their livestock toward safer areas when severe weather approached.
Lightning, thunder, clouds, wind, and rainfall are not isolated events. They are different expressions of the powerful movements of heat, moisture, electricity, and air within the atmosphere.
Nature continually provides us with spectacular examples of how different physical processes are connected. Careful field observation, combined with scientific knowledge, can help us understand these dramatic events taking place above us.
The picture shows lightning between two clouds that causes rainfall.
