gen-define-precipitation-types-and-give-one-short-worked-example-2d9a

Define precipitation types and give one short worked example.

# Precipitation Types Precipitation is water (liquid or solid) that falls from clouds to the Earth's surface. The main types are: ## 1. **Rain** - Liquid water drops > 0.5 mm diameter - Forms when water vapor condenses in clouds ## 2. **Drizzle** - Tiny water drops < 0.5 mm diameter - Light, uniform fall from low stratus clouds ## 3. **Snow** - Ice crystals forming when temperature < 0°C - Forms around condensation nuclei in clouds ## 4. **Sleet (Ice Pellets)** - Frozen raindrops - Forms when rain falls through a cold air layer ## 5. **Freezing Rain** - Liquid rain that freezes on contact with cold surfaces - Creates ice coating (glaze) ## 6. **Hail** - Ice balls > 5 mm diameter - Forms in strong thunderstorm updrafts --- ## **Worked Example: Formation of Sleet** **Scenario:** A weather front passes over a region with the following atmospheric layers (surface to upper atmosphere): - **Ground level:** -2°C - **Layer 1 (0-500m):** -3°C (cold air) - **Layer 2 (500-2000m):** +4°C (warm air) - **Layer 3 (above 2000m):** -8°C (cloud level) **Process:** 1. Snow forms in clouds at -8°C 2. Snow falls through warm layer (+4°C) → **melts to rain** 3. Rain falls through cold layer (-3°C) → **refreezes to ice pellets** 4. Ice pellets reach ground as **sleet** **Result:** Sleet precipitation occurs