Under what conditions do thunderstorms develop? What provides the energy that drives clouds to the top of the troposphere? How do meteorologists explain lightning?

Short Answer

Expert verified
Thunderstorms develop under an unstable atmosphere when a layer of warm, moist air near the surface is trapped under a layer of cooler, drier air, a lifting mechanism, such as solar heating or cold air pushing against warm air, forces the warm, moist air upwards, and when high humidity is present. The energy that drives clouds to the top of the troposphere is latent heat, released during the process of condensation. Meteorologists explain lightning through the process of charge separation within the cumulonimbus cloud, where water droplets and ice crystals collide, causing electric charges to separate. When the electric potential difference between opposite charges becomes too large, a lightning bolt occurs as a discharge of electrical energy.

Step by step solution

01

Development of Thunderstorms

A thunderstorm happens due to atmospheric instability, which occurs when there is rapid and intense heating of earth's surface. This causes the air close to the surface to rise, carrying with it, a large amount of moisture. To explain the development of thunderstorms, we'll follow these steps: 1. Condensation: As the warm, moist air rises, it cools and condenses, forming clouds of water droplets or ice crystals. 2. Mature stage: The upward movement of warm air continues, while the cloud grows vertically into the atmosphere. The cloud becomes a cumulonimbus cloud, and precipitation starts to fall. Updrafts and downdrafts within the cloud cause a collision between the water droplets and ice crystals, which creates an electrical charge. 3. Dissipating stage: The electrical charge produced within the cumulonimbus cloud is discharged as lightning, followed by thunder. Eventually, the updrafts weaken, and the entire cloud starts to dissipate. To have thunderstorms, three conditions must be met: 1. Unstable atmosphere: A layer of warm, moist air near the surface is trapped under a layer of cooler, drier air. 2. Lifting mechanism: Something must lift the warm, moist air upwards, such as solar heating, cold air pushing against warm air, or a mountain range forcing air upward. 3. High humidity: When water vapor content in the atmosphere is high, it supplies the moisture needed for cloud formation and precipitation.
02

Energy Source

The energy that drives clouds to the top of the troposphere is called latent heat, which is the energy needed for water to change from one state to another. In the case of thunderstorms, the latent heat is released during the process of condensation, as the warm, moist air rises and cools. This release of latent heat provides the energy for the cloud to continue rising towards the top of the troposphere.
03

Explaining Lightning

Meteorologists explain lightning through the process of charge separation within the cumulonimbus cloud. As the water droplets and ice crystals collide with each other due to the updrafts and downdrafts, it causes a separation of electric charges within the cloud. This results in the lower part of the cloud having a negative charge, and the upper part having a positive charge. The ground below the cloud also becomes positively charged as it tries to neutralize the negative charge in the cloud. When the electric potential difference between the oppositely charged regions becomes too large, the negatively charged electrons will try to balance out the positive charges. This results in a lightning bolt, which is the discharge of electrical energy that travels between the charged regions, either within the cloud or between the cloud and the ground.

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