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Summary

The Meteorology, Climatology, and Geophysics Agency (BMKG) confirmed a rare hailstorm that occurred in Depok on September 21, accompanied by lightning, thunder, strong winds, and heavy rain. This phenomenon is linked to the transitional season (*pancaroba*), where intense heat causes rapid evaporation, forming thick cumulonimbus clouds. These clouds carry water droplets upward, where they freeze and fall as hail. The storm is more likely to occur when there is a large temperature difference in the atmosphere, with hail often resulting from such extreme conditions.

Takeaways

• 😀 BMKG confirmed moderate to heavy rain with lightning, thunder, strong winds, and hail occurred on Tuesday, September 21.
• 😀 Hail is a rare phenomenon that forms in thick clouds like cumulonimbus clouds (CB clouds).
• 😀 Cumulonimbus clouds contain more solid water compared to liquid water, which leads to hail formation.
• 😀 Before hail occurs, the air temperature tends to be very hot, especially in the morning and night.
• 😀 The hot temperature causes water on the surface to evaporate more quickly, forming thick clouds that contain water droplets.
• 😀 These thick clouds, which are filled with water droplets, are often accompanied by strong winds.
• 😀 The water droplets are then blown upwards into cold layers of the cloud, where they freeze due to the freezing temperature at higher altitudes.
• 😀 Hailstones grow larger as they continue to freeze and fall to the ground due to their weight.
• 😀 Hail typically occurs during the transitional seasons (pancaroba) when there are sharp temperature differences.
• 😀 It is important to stay cautious during hail events as they can cause significant damage.

Q & A

What is a hailstorm and how does it form?

A hailstorm is a weather phenomenon where ice pellets, known as hail, fall from the sky. It forms when water droplets in thick clouds (cumulonimbus clouds) are carried upward by strong winds into colder layers of the atmosphere, where they freeze. As the ice particles grow larger, they eventually fall to the ground when they become too heavy.

What conditions are typically required for a hailstorm to occur?

Hailstorms usually occur during the transition seasons (pancaroba), when there is a significant temperature difference between day and night, and when strong winds are present. These conditions contribute to the formation of large, thick clouds capable of producing hail.

What role does temperature play in the formation of a hailstorm?

Temperature plays a crucial role as hot weather leads to faster evaporation of water from the Earth's surface, forming thick clouds. When these clouds reach higher altitudes, the water droplets freeze due to the cold temperatures in the upper atmosphere, eventually forming hail.

How do cumulonimbus clouds contribute to the occurrence of hail?

Cumulonimbus clouds, or CB clouds, are characterized by their thickness and the presence of both liquid and solid water. These clouds provide the necessary conditions for hail formation, as they contain large amounts of water that can be carried upward by strong winds into colder regions of the atmosphere, where it freezes into hail.

Why are hailstorms considered rare weather events?

Hailstorms are rare because they require a specific set of atmospheric conditions, including hot weather, strong winds, and significant temperature differences between the surface and the upper atmosphere, which is not commonly observed in all weather patterns.

What is the impact of hailstorms on the environment?

Hailstorms can cause damage to crops, vehicles, roofs, and other structures due to the force with which hailstones fall. The size and weight of the ice pellets can also cause injury or pose a risk to people and animals caught in the storm.

What weather phenomenon is usually associated with hailstorms?

Hailstorms are often associated with thunderstorms, which typically involve heavy rain, strong winds, lightning, and thunder. The conditions that lead to hail formation are usually accompanied by these other intense weather phenomena.

How does wind contribute to the formation of hail?

Wind plays a crucial role in the formation of hail by carrying water droplets upward into the colder layers of the atmosphere. Strong winds can cause the droplets to rise higher and freeze, forming larger and heavier hailstones that eventually fall to the ground.

What does the term 'pancaroba' mean in relation to hailstorms?

'Pancaroba' refers to the transition period between seasons, typically marked by unpredictable and extreme weather conditions. This time is often associated with large temperature swings and strong winds, both of which can contribute to the formation of hailstorms.

What precautions should people take during a hailstorm?

During a hailstorm, it is essential to seek shelter indoors or in a sturdy building to avoid injury from falling hailstones. People should avoid being outside, particularly in open areas, and protect their vehicles and property from potential damage.