Atmospheric Circulation and Weather Systems | Class 11 Geography Notes
By ConceptScroll Team · Published on 17 July 2026 · 3 min read
Atmospheric Circulation and Weather Systems – this guide gives you a concise, exam-ready overview of Atmospheric Circulation and Weather Systems from Class 11 Geography, written by ConceptScroll editors and reviewed against the latest NCERT textbook.
Types of Rainfall
Rainfall is classified into three main types based on its origin:
1. Convectional Rainfall: Occurs when the sun heats the earth's surface, warming the air above it. The warm air rises in convection currents, expands, cools, and condenses to form cumulus clouds. This results in heavy rainfall often accompanied by thunder and lightning. It is common in equatorial regions and interior continental areas during summer or the hotter part of the day.
2. Orographic (Relief) Rainfall: Happens when moist air is forced to ascend over mountains. As the air rises, it expands and cools, causing condensation and precipitation on the windward slopes. The leeward slopes receive less rain and are often dry, known as rain-shadow areas.
3. Cyclonic (Frontal) Rainfall: Associated with extra-tropical cyclones where warm and cold air masses meet, causing uplift and precipitation. This type of rainfall is common in mid-latitudes.
Each type of rainfall plays a significant role in shaping regional climates and ecosystems.
📊 Diagram: None in this section.
🧪 Activity: Refer to Chapter 9 for detailed study of cyclonic rainfall.
🔗 Connection: Leads to understanding the global distribution of rainfall and its seasonal patterns.
Frequently asked questions
Along 30° N and 30° S are found the high-pressure areas known as:
Subtropical highs
The atmospheric pressure is expressed in units of…………
Milibars
1. Multiple choice questions. (i) Which one of the following is the most important constituent of the atmosphere for human beings? (a) Water vapour (c) Dust particle (b) Nitrogen (d) Oxygen (ii) Which one of the following process is responsible for transforming liquid into vapour? (a) Condensation (c) Evaporation (b) Transpiration (d) Precipitation (iii) The air that contains moisture to its full capacity : (a) Relative humidity (c) Absolute humidity (b) Specific humidity (d) Saturated air (iv) Which one of the following is the highest cloud in the sky? (a) Cirrus (c) Nimbus (b) Stratus (d) Cumulus
1.(i) The most important constituent of the atmosphere for human beings is Oxygen (d). Oxygen is essential for respiration and survival.
(ii) The process responsible for transforming liquid into vapour is Evaporation (c). Evaporation is the change of state from liquid to gas.
(iii) The air that contains moisture to its full capacity is Saturated air (d). Saturated air holds the maximum amount of water vapour possible at a given temperature.
(iv) The highest cloud in the sky is Cirrus (a). Cir
2. Answer the following questions in about 30 words. (i) Name the three types of precipitation. (ii) Explain relative humidity. (iii) Why does the amount of water vapour decreases rapidly with altitude? (iv) How are clouds formed? Classify them.
(i) The three types of precipitation are: Rain, Snow, and Hail.
(ii) Relative humidity is the ratio of the amount of water vapour present in the air to the maximum amount it can hold at that temperature, expressed as a percentage.
(iii) The amount of water vapour decreases rapidly with altitude because temperature decreases with height, reducing the air's capacity to hold moisture.
(iv) Clouds are formed when moist air rises, cools, and condenses into tiny water droplets or ice crystals. Clou
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