Rain

rainfallrainwaterrainstormrain watertorrential rainWettest places on Earthdownpourrain stormrainsrainy
Rain is liquid water in the form of droplets that have condensed from atmospheric water vapor and then become heavy enough to fall under gravity.wikipedia
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Water

H 2 OHOliquid water
Rain is liquid water in the form of droplets that have condensed from atmospheric water vapor and then become heavy enough to fall under gravity.
It forms precipitation in the form of rain and aerosols in the form of fog.

Precipitation

rainfallhydrometeorannual precipitation
Rain is liquid water in the form of droplets that have condensed from atmospheric water vapor and then become heavy enough to fall under gravity.
The main forms of precipitation include drizzle, rain, sleet, snow, graupel and hail.

Wet season

rainy seasonmonsoon seasonwet
The movement of the monsoon trough, or intertropical convergence zone, brings rainy seasons to savannah climes.
The wet season (sometimes called the rainy season) is the time of year when most of a region's average annual rainfall occurs.

Irrigation

irrigatedirrigateirrigation system
It provides suitable conditions for many types of ecosystems, as well as water for hydroelectric power plants and crop irrigation.
Archaeological investigation has found evidence of irrigation in areas lacking sufficient natural rainfall to support crops for rainfed agriculture.

Water cycle

hydrological cyclewaterhydrologic cycle
Rain is a major component of the water cycle and is responsible for depositing most of the fresh water on the Earth.

Raindrop impressions

Rain falling on loosely packed material such as newly fallen ash can produce dimples that can be fossilized, called raindrop impressions.
Raindrop impressions are a geological feature characterized by small crater-like pits with slightly raised edges that are the result of the impact of raindrop impacts on soft sediment surfaces.

Drizzle

drizzlydrizzlingorballo
At sea level and without wind, 0.5 mm drizzle impacts at 2 m/s or 4.5 mph, while large 5 mm drops impact at around 9 m/s or 20 mph.
Drizzle is a light liquid precipitation consisting of liquid water drops smaller than those of rain – generally smaller than 0.5 mm in diameter.

Monsoon

southwest monsoonmonsoonsnortheast monsoon
Savanna climates and areas with monsoon regimes have wet summers and dry winters. The five primary classifications can be further divided into secondary classifications such as rain forest, monsoon, tropical savanna, humid subtropical, humid continental, oceanic climate, Mediterranean climate, steppe, subarctic climate, tundra, polar ice cap, and desert.
The term was first used in English in British India and neighbouring countries to refer to the big seasonal winds blowing from the Bay of Bengal and Arabian Sea in the southwest bringing heavy rainfall to the area.

Cumulonimbus cloud

cumulonimbusthundercloudcumulonimbus clouds
If enough moisture and upward motion is present, precipitation falls from convective clouds (those with strong upward vertical motion) such as cumulonimbus (thunder clouds) which can organize into narrow rainbands.
Cumulonimbus storm cells can produce torrential rain of a convective nature (often in the form of a rain shaft) and flash flooding, as well as straight-line winds.

Extratropical cyclone

extratropicalextratropical transitionextratropical storm
Similar ascent is seen around tropical cyclones outside the eyewall, and in comma-head precipitation patterns around mid-latitude cyclones.
Extratropical cyclones are capable of producing anything from cloudiness and mild showers to heavy gales, thunderstorms, blizzards, and tornadoes.

Cloud

cloudscloud formationcloudy
How much water vapor a parcel of air can contain before it becomes saturated (100% relative humidity) and forms into a cloud (a group of visible and tiny water and ice particles suspended above the Earth's surface) depends on its temperature.
If the droplets become too large and heavy to be kept aloft by the air circulation, they will fall from the cloud as rain.

Coalescence (physics)

coalescencecoalescecoalescing
Coalescence occurs when water droplets fuse to create larger water droplets.
In meteorology, its role is crucial in the formation of rain.

Kona storm

Kona lowKona winds
Systems known as Kona storms affect the state with heavy rains between October and April.
Among their hazards are heavy rain, hailstorms, flash floods and their associated landslides, high elevation snow, high winds which result in large surf and swells, and waterspouts.

Rainforest

rain forestrainforestsemergent
The five primary classifications can be further divided into secondary classifications such as rain forest, monsoon, tropical savanna, humid subtropical, humid continental, oceanic climate, Mediterranean climate, steppe, subarctic climate, tundra, polar ice cap, and desert.
Average annual rainfall is no less than 168 cm and can exceed 1000 cm although it typically lies between 175 cm and 200 cm.

Storm

stormswindstormtempest
The humid subtropical climate zone is where winter rainfall is associated with large storms that the westerlies steer from west to east.
Storms have the potential to harm lives and property via storm surge, heavy rain or snow causing flooding or road impassibility, lightning, wildfires, and vertical wind shear.

Fresh water

freshwaterfreshlimnic
Rain is a major component of the water cycle and is responsible for depositing most of the fresh water on the Earth.
The source of almost all fresh water is precipitation from the atmosphere, in the form of mist, rain and snow.

Tropical cyclone

hurricanetropical stormhurricanes
Similar ascent is seen around tropical cyclones outside the eyewall, and in comma-head precipitation patterns around mid-latitude cyclones.
Tropical cyclones out at sea cause large waves, heavy rain, flood and high winds, disrupting international shipping and, at times, causing shipwrecks.

Biome

biotabiomesmajor habitat type
A tropical savanna is a grassland biome located in semi-arid to semi-humid climate regions of subtropical and tropical latitudes, with rainfall between 750 and 1270 mm a year.
Holdridge classified climates based on the biological effects of temperature and rainfall on vegetation under the assumption that these two abiotic factors are the largest determinants of the types of vegetation found in a habitat.

Summer

summer seasonaustral summersummers
When the wet season occurs during the warm season, or summer, rain falls mainly during the late afternoon and early evening hours.
In southern and southeast Asia, where the monsoon occurs, summer is more generally defined as lasting from March, April, May and June, the warmest time of the year, ending with the onset of the monsoon rains.

Grassland

grasslandsgrassveldgrass
A tropical savanna is a grassland biome located in semi-arid to semi-humid climate regions of subtropical and tropical latitudes, with rainfall between 750 and 1270 mm a year.
As flowering plants and trees, grasses grow in great concentrations in climates where annual rainfall ranges between 500 and 900 mm.

Virga

all of its precipitation evaporatesevaporating before reaching the surfacefall streak
This is termed virga and is more often seen in hot and dry climates.
Virgae can cause varying weather effects, because as rain is changed from liquid to vapor form, it removes significant amounts of heat from the air due to water's high heat of vaporization.

Anabatic wind

Upslope windsanabatichill itself
In mountainous areas, heavy precipitation is possible where upslope flow is maximized within windward sides of the terrain at elevation which forces moist air to condense and fall out as rainfall along the sides of mountains.
These can then produce rain or even thunderstorms.

Climate

climaticclimatesaverage annual temperature
In mountainous parts of the world subjected to relatively consistent winds (for example, the trade winds), a more moist climate usually prevails on the windward side of a mountain than on the leeward or downwind side.
Rainforests are characterized by high rainfall, with definitions setting minimum normal annual rainfall between 1750 mm and 2000 mm.

South America

South AmericanSouthSouth-America
They are widespread on Africa, and are also found in India, the northern parts of South America, Malaysia, and Australia.
The average annual temperatures in the Amazon basin oscillate around 27 C, with low thermal amplitudes and high rainfall indices.

Rainband

banding featuresouter bandsrainbands
If enough moisture and upward motion is present, precipitation falls from convective clouds (those with strong upward vertical motion) such as cumulonimbus (thunder clouds) which can organize into narrow rainbands.
Banding within the comma head precipitation pattern of an extratropical cyclone can yield significant amounts of rain or snow.