How Do Snow and Hail Form?

What Are Snow and Hail?

Snow consists of white particles formed from ice crystals that fall from clouds to the ground.

Hail forms when water droplets in the atmosphere freeze solid and turn into ice pellets.

Both are types of precipitation but snow is soft while hail is hard.

How Does Snow Form?

For snow to form the air temperature must be below 0°C (zero degrees Celsius).

1. Condensation: Water vapor rises and turns into ice crystals in cold layers of air.

2. Crystal Aggregation: These crystals stick together to form snowflakes.

3. Precipitation: Snowflakes gradually fall to the ground once they reach a certain weight.

Snowflakes are always six-sided but each has a unique shape!

(Generated by artificial intelligence.)

How Does Hail Form?

Hail can occur even during warm weather because the interior of clouds can be extremely cold.

1. Strong Updraft: When air rises rapidly water droplets are carried upward.

2. Freezing: These droplets freeze into ice in the upper parts of clouds.

3. Layered Growth: As the ice pellets fall and are lifted again new water droplets adhere to them and freeze, adding layers.

4. Hail Falls: Once the hailstones become too heavy they fall to the ground.

Scientific Explanation

- Snow forms through direct transition from gas to solid (sublimation).

- Hail first becomes liquid then freezes into a solid.

- Water vapor and temperature in the atmosphere play a crucial role in both processes.

- The diameter of hailstones typically ranges from 5 mm to 50 mm.

Where Are They Observed?

- Snow: Common in polar regions high mountains and areas experiencing winter seasons.

- Hail: Occurs during spring and summer especially in regions with storm clouds.

(Generated by artificial intelligence.)

How Do Snow and Hail Affect Nature?

Snow:

- Moistens the soil.

- Protects plants from extreme cold.

- Feeds freshwater sources.

Hail:

- Can damage agricultural crops.

- Can break car windows and other glass surfaces.

- However it contributes to water resources.

(Generated by artificial intelligence.)

References

TÜBİTAK Bilim Genç. “Why Are Snowflakes Hexagonal?” https://bilimgenc.tubitak.gov.tr/makale/kar-taneleri-neden-altigen

National Geographic Kids. “What Is Hail?” https://kids.nationalgeographic.com/nature/article/hail

NOAA. “How Snow Forms.” https://www.noaa.gov/education/resource-collections/weather-atmosphere/how-snow-forms

Met Office UK. “What is Hail?” https://www.metoffice.gov.uk/weather/learn-about/weather/types-of-weather/hail

Koç H. “Atmosphere and Precipitation Mechanisms.” Department of Geography Uludağ University Access: 2025.

https://acikerisim.uludag.edu.tr/server/api/core/bitstreams/b6adc9aa-7cb5-439b-8027-d99d38681695/content