PRECIPITATION Flashcards

(40 cards)

1
Q

General term for all forms of moisture originating from clouds and falling to the ground

A

Precipitation

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2
Q

Precipitation happens when water falls down to the earth surface. This water might be ___ & ____

A

Liquid or Solid State

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3
Q

consists of waterdrops under 0.02-in. diameter

A

Drizzle

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4
Q

consists of drop usually greater than 0.02-in. diameter

A

Rain

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5
Q

is the ice coating formed when drizzle or rain freezes

A

Glaze

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6
Q

is frozen raindrops cool to the ice stage while falling through air at subfreezing temperatures.

A

Leet

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7
Q

precipitation in the form of Ice crystals resultung from sublimation

A

Snow

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8
Q

is made up of a number of ice crystals fused together.

A

Snowflake

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9
Q

is precipitation in the form of balls or lumps of ice over 0.2-in. diameter formed by alternative freezing and melting

A

Hail

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10
Q

Types of Precipitation

A

Convective precipitation
Cyclonic precipitation
Orographic precipitation

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11
Q

Forms of precipitation

A

Snow
Snowflake
Hail

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12
Q

is the interfere between two distinct air masses.

A

Front

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13
Q

is caused by natural rising of warmer, lighter air in colder, denser surroundings.

A

Convective precipitation

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14
Q

results from the lifting of air converging into a low-pressure area, or cyclone.

A

Cyclonic precipitation

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15
Q

results frok mechanical lifting over mountain barriers.

A

Orographic precipitation

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16
Q

is a large low pressure region with circular wind motion

A

Cyclone

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17
Q

Two types of Cyclone

A

Tropical cyclones
Extra tropical cyclones

18
Q

are regions of high pressure, usually of harge areal extent. It cause clockwise wind circulation in the northerm hemisphere.

19
Q

is the amount of precipitation, the form of rain (water from clouds), that descends onto the surface of Earth

20
Q

is falling snowflakes or snow crystals or also the accumulation of snow during a specified period of time.

21
Q

is the simplest avareging method but can only be relied on small, flat areas.

A

Arithmetic mean method

22
Q

is a graphical technique that considers the weights of each rain gages based on the relatice measurements of their respective area coverage.

A

Thiessen polygon

23
Q

is also a graphical technique that involves drawing isohyets or contours that are equal to the respective rainfall gage over an area based on point measurements.

A

Isohyetal method

24
Q

is used when the normal annual precipitation at each of the index stations is less or more than 10 percent of that for the station with the missing record.

A

Normal ration method

25
is defined as a change in the amount of precipitation that falls naturally in a certain location.
Variation of precipitation
26
where conditions are crucial for the formation of snowflakes
Atmosphere
27
the atmophere is below freezing (0 degrees Celcius or 32 degrees Fahrenheit)
Supercooling
28
These are microscopic particles, such as dust, pollen, or other solid particles
Ice Nuclei
29
when the air is holding more moisture than it can actually accmmodqte at a given temperature.
Supersaturation
30
When supersaturated air encounters an ice nucleus
Deposition
31
As the ice crystals grow, they start to consume surrounding water vapor
Vapor Diffusion
32
As rhe ice crustals fall through the atmosphere, they may collide woth other ice crystals
Aggregation
33
once the snowflake becomes too heavy for the updrafts in the atmosphere to support, it falls to the ground as snow.
Precipitation
34
it indicates the typical amount of snow that falls in a given period
Average Snowfall
35
A lower-than-average snowfall may indicate drier or milder conditions than usual.
Below-average snowfall
36
higher-than-average snowfall suggest wetter or colder conditions
Above-average snowfall
37
Examining the variability in snowfall data
Snowfall Variability
38
it suggests relatively consistent snowfall patterns from year to year.
Low variability
39
indicates significant fluctuations in snowfal amounts
high variability
40
measures how often snowfall events occur within a specific timeframe
Snowfall Frequency