What Is Orographic Rainfall Class 9 Geography?

Orographic rainfall occurs when a mass of air is pushed up because of a structure with very high elevation, such as a mountain. The lifted air cools down and precipitation occurs. Rain shadow area is formed on the other side of the elevation.

What is orographic rain in India?

Orographic rainfall occurs when rain bearing winds strike against the mountains and result in precipitation on the windward side of the mountains. In India, rainfall is orographic in nature as heavy rains occurs on the windward slopes of the Western Ghats and scanty rainfall on the leeward side.

Where is orographic rainfall in India?

Complete answer: The Western Ghats in India provide favorable conditions for orographic rainfall. The warm and moist air from the Arabian sea is blocked by the Western Ghats and gets lifted over mountain ranges.

What type of rainfall is in India?

Most of India’s rainfall is convectional. The convectional rainfall is prevalent in equatorial regions. In these, the warm air rises up and expands then, reaches at a cooler layer and saturates, then condenses mainly in the form of cumulus or cumulonimbus clouds.

What is Convectional rainfall?

Convectional rainfall is a type of rainfall that involves the formation of convection currents. … This rainfall occurs when the temperature gets high and the warmer air rises up in the atmosphere. On expansion, this air cools down and clouds are formed, which are generally cumulus clouds.

How is annual rainfall calculated?

(i) Annual rainfall = Sum of rainfall in all twelve months. Therefore, annual rainfall is 129.2 cm. The total annual rainfall = Sum of rainfall in all twelve months. Therefore, annual rainfall is 128.7 cm.

Which area orographic rainfall occurs?

Orographic precipitation is well known on oceanic islands, such as the Hawaiian Islands or New Zealand, where much of the rainfall received on an island is on the windward side, and the leeward side tends to be quite dry, almost desert-like, by comparison.

What are the 3 types of rain?

There are three different types of rainfall:

  • relief.
  • convectional.
  • frontal.

What are the 4 types of rainfall?

Types of Rainfall

  • Convectional rainfall.
  • Orographic or relief rainfall.
  • Cyclonic or frontal rainfall.

What are the 8 types of precipitation?

The different types of precipitation are:

  • Rain. Most commonly observed, drops larger than drizzle (0.02 inch / 0.5 mm or more) are considered rain. …
  • Drizzle. Fairly uniform precipitation composed exclusively of fine drops very close together. …
  • Ice Pellets (Sleet) …
  • Hail. …
  • Small Hail (Snow Pellets) …
  • Snow. …
  • Snow Grains. …
  • Ice Crystals.

What is called cyclonic rainfall?

Cyclonic or Frontal rain: This type of rainfall occurs when warm and cold air meets each other. Since warm air is lighter, it rises above the cold air. The rising air is then cooled beyond the saturation point resulting in heavy rainfall. Such rainfall lasts only for few hours.

What is a rain shadow?

A rain shadow is a patch of land that has been forced to become a desert because mountain ranges blocked all plant-growing, rainy weather. On one side of the mountain, wet weather systems drop rain and snow. On the other side of the mountain—the rain shadow side—all that precipitation is blocked.

What is rainfall explain?

Rainfall is the amount of precipitation, in the form of rain (water from clouds), that descends onto the surface of Earth, whether it is on land or water. It develops when air masses travel over warm water bodies or over wet land surfaces. … The clouds eventually release this water vapor, which is dropped as rainfall.

What is an annual rainfall?

Save. Copy. Average annual rainfall means the average of the annual amount of precipitation for a location over a year as measured by the nearest National Weather Service station for the preceding three decades.

How much is 1mm rain?

However, 1 mm of rain refers to the “depth” of rain that would be received in 1 meter² (m²) or a square of one metre in length and width. So 1 mm of rain translates to 1 litre of water in a single metre square.

How do you calculate rainfall range?

From our list of scores we can see that the highest average monthly rainfall was 715 millimeters and the lowest recorded average was 100 millimeters so the range is calculated using 715 minus 100 which equals 615. Therefore put simply, the formula or rule for finding the range is highest score minus lowest score.

What are the 6 seasons in India?

Traditionally, North Indians note six seasons or Ritu, each about two months long. These are the spring season (Sanskrit: vasanta), summer (grīṣma), monsoon season (varṣā), autumn (śarada), winter (hemanta), and prevernal season (śiśira).

What are the 3 seasons in India?

Mountain

  • Winter, occurring from December to February. …
  • Summer or pre-monsoon season, lasting from March to May. …
  • Monsoon or rainy season, lasting from June to September. …
  • Post-monsoon or autumn season, lasting from October to November.

Does it ever snow in India?

Like all other parts of the world, snowfall in India is synonymous with bewitching sceneries, often seen in wallpapers and calendars. But if you really want to experience the same, the best snow season in India is during the winter months of December to February.

Where is Convectional rainfall found?

Convectional rainfall is widespread in areas where the ground is heated by the hot sun, such as the Tropics. This is why areas, such as the Amazon Rainforest, experience heavy rainfall most afternoons.

How Convectional rainfall are formed?

Convectional rainfall

When the land warms up, it heats the air above it. This causes the air to expand and rise. As the air rises it cools and condenses. If this process continues then rain will fall.

What is a frontal rainfall?

Frontal rain occurs when two air masses meet. When a warm air mass meets a cold air mass, they don’t mix as they have different densities (a bit like oil and water). Instead, the warm less dense air is pushed up over the cold dense air creating the ‘front’.