Snow

**1. Snow Formation and Meteorology:**
– Snow develops in clouds as part of weather systems.
– Snowfall occurrence at different elevations.
– Factors influencing snow production like low-pressure areas, mid-latitude cyclones, and frontal snowsqualls.
– Lake and ocean effects on snowfall.
– Mountain effects on snowfall including orographic snowfall.
– Adiabatic cooling and precipitation in snow formation.
– Snow depth and persistence in snow-prone areas.
– Enhancement of precipitation by mountain waves.

**2. Snow Crystal Development and Classification:**
– Physics of snow crystal development.
– Classification of snow crystal shapes.
– Formation of snowflakes under clear sky.
– Snowflake structure and composition.
– Factors influencing snowflake shapes.
– Variety of snowflake shapes and formation process.
– Snowflake metamorphosis and snow accumulation into a snowpack.
– Processes of sintering, sublimation, and freeze-thaw.

**3. Snow Properties and Impact:**
– Physical properties of snow like density, mechanical, thermal, and electrical properties.
– Transportation challenges and snow clearing.
– Agricultural impact including water provision for crops and livestock protection.
– Snow sports like skiing, snowboarding, and snowmachining.
– Military operations and warfare in snowy conditions.
– Ecosystem impact as an insulating layer for plants and animals during winter.

**4. Snow Measurement and Distribution:**
– Snow accumulation through freezing and thawing events in cold regions.
– Major snow-prone areas like the Arctic, Antarctic, Northern Hemisphere, and alpine regions.
– Methods of measuring snowfall using snow gauges, ultrasonic sensors, and liquid equivalents.
– Distribution of snow cover on Earth’s surface and changes over time.
– Records of snowfall and snow cover worldwide.

**5. Snow Metamorphism and Seasonal Changes:**
– Snow transformation from deposition to melting or glacial ice.
– Seasonal changes in snowpack density and persistence.
– Snow drifting with wind and formation of snow slabs.
– Avalanche risks and types like slab and powder snow avalanches.
– Snowpack settling, compaction, and transformation into névé in colder climates.