What is precipitation? Precipitation is any form of moisture which falls to the earth. This includes rain, snow, hail and sleet. Precipitation occurs when water. Frontal rainfall happens where warm fronts meet cold fronts. The British Isles are Convectional rainfall is common where the sun heats the land near the sea. Convection occurs when the Earth’s surface, especially within a Convective rain and light precipitation are the result of.

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British weather and climate

Clouds form and precipitation occurs. Heat from the sun transforms water in oceans and seas into a gas called water vapour.

Graupel accumulation in Elko, Nevada. Liquid forms of precipitation include rain and drizzle. Orographic precipitation occurs when moist air is forced convsctional over rising terrain, such as a mountain. Arinfall snowfall describes conditions when visibility is restricted below. First, a warm front passes over, bringing rain and then warmer air.

Weather Hazards What is the difference between a tornado and a hurricane? Then a cold front follows, bringing more rain and cooler air.

Convectional Rainfall Stage 1. This type of rainfall is very common in tropical areas between the Tropic of Cancer and Tropic of Capricorn but also in areas such as South East England during warm sunny spells. This includes rain, snow, hail and sleet. The warm air is forced over the cold air Stage 3. In South America, the Andes mountain range blocks Pacific Ocean moisture that arrives on the continent, resulting in a desert-like climate just downwind across western Argentina.


Find out about relief and frontal rainfall. Precipitation occurs when local air becomes saturated with water vapor, and can no longer maintain the level of water vapor in gaseous form. If this process continues rainfall will occur. Stage 2 As the air rises it cools and water vapour condenses to form clouds.

Depressions pass over Britain frequently. Heavy rain describes rainfall with a precipitation rate above 7. When warm and cold air meet, a depression forms: When the condensation point is reached large cumulonimbus clouds are formed. As the air rises it cools and condenses. It happens as the result of warm, moist air being cooled, leading to condensation and in turn rain. Convective and stratiform rainfall in the tropics. What is convectional rainfall?

Why does most rain fall in the west? Moisture is removed by orographic lift, leaving drier air see Foehn on the descending generally warmingleeward side where a rain shadow is observed. Orographic precipitation is similar, except the upwards motion is forced when a moving airmass encounters the rising slope of a landform such as a mountain ridge. This site uses cookies. If this process continues then rain will fall.

Convectional rainfall diagram | tillsgeogblog

Cold fronts occur when a mass of cooler air dislodges a mass of warm air. Air is forced to rise over high areas. November 11, – 7: Warm fronts occur where warm air pushes out a previously extant cold air mass.


The sun heats the ground and warm air rises. A wide variety of weather can be found along an occluded frontbut usually their passage is associated with a drying of the air mass. Most precipitation in the tropics appears to be convective; however, it has been suggested that stratiform and convective precipitation often both occur within the same complex of convection-generated cumulonimbus.


Warm fronts are followed by extended periods of light rain and coonvectional due to the fact that, after the warm air rises above the cooler air which remains on the groundit gradually cools due to the air’s expansion while being lifted, which forms clouds and leads to precipitation.

In the UK, depressions often follow a similar pattern. Heavy rain storms occur.

Windward sides face the east-to-northeast trade winds and receive much more rainfall; convcetional sides are drier and sunnier, with less rain and less cloud cover. Frontal precipitation is the result of frontal systems surrounding extratropical cyclones or lows, which form when warm and tropical air meets cooler air. Which types of rainfall commonly affect Britain? All articles with dead external links Articles with dead external links from July Webarchive template wayback links Wikipedia articles needing clarification from April