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Flashcards in Met - Water in the Atmosphere Deck (26)
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1

Instability exists when .....

the rising or sinking air continues to rise or sink of its own accord

2

What can increase the ELR .....

Anything that increases the difference between the top and bottom of the atmosphere i.e.

1. Warming of the lower levels

2. Cooling of the upper levels

2

The amount of water vapor a parcle of air can hold depends on its .....

temperature

3

Relative Humidity = ..... / ..... x 100%

Vapor Present / Vapor Possible x 100%

3

Low level jet streams can be hazardous because the produce .....

strong horizontal windshear near the surface

4

Conditional stability exists when there is ......

1. Saturated air is unstable

2. Dry air is stable

5

Strong horizontal windsheat can be encountered above a

surface inversion

5

The vis and turbulence above a subsistance inversion is .....

better visability and less turbulence

6

What type of wind will reinforce a land breeze .....

Katabatic wind

6

Lower humidity on the lee side of a mountain at low level is likely to be caused by a .....

Fohn Wind

8

DALR = 

30/1000ft

9

The adabatic process can be defined as .....

when temperature changes without any transfer of heat into our out of a system i.e. compression

10

ELR=

20/1000ft

11

A change in ..... will change relative humidity 

temperature

11

A wind blowing up sloping terrain during the day could be .....

an anabatic wind

13

SALR =

1.50/1000ft

14

Saturation of a parcle of air occurs when .....

1. Water vapor is at a constant temperature and more water vapor is added until saturation occurs to that parcle of air

2. The parcle of airs temperature is reduced until it can no longer hold  any more vapor

16

Define Subsidence Inversion .....

1. As air moves down in a high it warms adabatically

2. Near the surface it moves out horizontally

3. The horizontal movement has no adabatic heating associated

4. This means that the air above is warmer becuase of the compression

5. This is associated with every high pressure system and usually occurs between 4000ft and 8000ft

18

Define a radiation temperature inversion .....

1. Air cools at night when in contact with the cold ground

2. This cold air becomes a layer

3. Gentle breezes deepen this layer

4. This will not occur on windy or cloudy nights

* Thing Radiation Inversion think Low Level Jet Stream

19

Define frontal inversion .....

When a cold front arrives its leading edge slips in under the warmer air creating the inversion

20

The onset of a light wind beneath a radiation inversion will cause it to become .....

weaker but deeper

21

Dew point temperature can be defined as .....

the temperature required for the relative humidity to reach 100%

22

CU cloud with a base of 3000ft AGL is observed over an aerodrome. The eleveation of the aerodrome is 2000ft AMSL and the temp is 180C. What height can freezing be expected in the cloud?

11,000ft

24

Name the 3 types of temperature inversions ......

1. Radiation Inversion

2. Frontal Inversion

3. Subsidence Inversion

25

Stability occurs when .....

the rising or sinking air stops rising or sinking of its own accord

26

The most common method of cloud formation is .....

cooling of air by expansion until saturation occurs