QUIZLET WEATHER

Question 1

Of the heat that reaches earth, how much gets reflected and how much gets absorbed?

Answer 1

“Of the heat that reaches earth, 55% gets reflected and 45% gets absorbed”

Question 2

What is diurnal temperature variation?

Answer 2

Diurnal temperature variation is the difference in temperature between day and night.

Question 3

What is the affect of high temperature on air density?

Answer 3

High temperature reduces air density and performance

Question 4

What creates local wind?

Answer 4

Diurnal and topographical temperature variations create local wind

Question 5

What is an effect of diurnal cooling?

Answer 5

Diurnal cooling is conducive to fog

Question 6

What type of dangerous precipitation can be caused by a temperature inversion?

Answer 6

An inversion aloft can cause rain to turn into freezing rain

Question 7

What is ‘hg’?

Answer 7

Hg is the abbreviation for millibars

Question 8

How does a pressure gradient relate to wind?

Answer 8

The greater the difference between pressure gradients the stronger the wind

Question 9

What is the affect of the Coriolis force in the northern hemisphere?

Answer 9

The Coriolis force deflects air to the right in the northern hemisphere

Question 10

When the temperature dewpoint spread is less than what will you experience fog?

Answer 10

When the temperature-dewpoint spread is less than 5 degrees, you may experience fog

Question 11

What is relative humidity?

Answer 11

How much humidity air can hold at a certain temperature…its current saturation is the relative humidity.

Question 12

What are condensation nuclei?

Answer 12

Condensation nuclei are the microscopic solid particles suspended in the atmosphere. Water vapor condenses around these nuclei

Question 13

What happens to the temperature of air as it expands or contracts?

Answer 13

When air expands its cool. When it compresses, it warms.

Question 14

What are the 4 categories of clouds?

Answer 14

high clouds, middle clouds, low clouds, and clouds with extensive vertical development

Question 15

What is a stationary front?

Answer 15

A stationary front is when neither air mass is replacing the other

Question 16

What is an occluded front?

Answer 16

Occluded front or frontal waves are where a cold front is overtaking a warm front

Question 17

How much ice does it take to decrease performance?

Answer 17

½” of ice can decrease performance by 50%

Question 18

What is the most dangerous type of icing?

Answer 18

Supercooled water such as freezing rain can create 3” of ice in just 5 minutes

Question 19

What is a microburst? Where are they found? What are their characteristics?

Answer 19

A powerful downdraft. Normally around thunderstorms. 6,000’ downdrafts, less than 1 mile in diameter to 2.5 miles in diameter at the base, very brief like 15 minutes

Question 20

What are the three levels of the atmosphere?

Answer 20

Troposphere, tropopause, stratosphere

Question 21

What is standard sea level temperature/pressure?

Answer 21

29.92” inches of mercury (Hg) and 59 degrees (15 celsius)

Question 22

What causes weather?

Answer 22

The sun - change in temperature (heat exchange)

Question 23

What causes winds aloft to flow parallel to isobars?

Answer 23

Coriolis force

Question 24

What are the types of fronts?

Answer 24

A cold front, warm front, stationary front, and occluded front

Question 25

What is an isobar?

Answer 25

A line which connects areas of equal barometric pressure

Image: What is an isobar?

Question 26

What is a ridge?

Answer 26

An area of high atmospheric pressure that is descending

Question 27

What is a trough?

Answer 27

An area of low atmospheric pressure that is rising

Question 28

What direction does high pressure air travel?

What direction low pressure air travel?

Answer 28

Outward, downward, and clockwise

Inward, upward, and counterclockwise

Question 29

What is convection?

Answer 29

This is hot air rising

Question 30

How does wind travel in relation to isobars at higher altitudes?

Answer 30

Parallel

Question 31

What are the main types of fog and what are their differences?

Answer 31

Upslope = fog that travels upslope
Steam = Cold air over a warm moist surface
Radiation = At night, the moisture on the earth radiates upwards
Advection = Warm moist air over a cold surface

Question 32

What causes wind?

Answer 32

Differences in pressure

Question 33

The most severe weather is generally associated with what?

Answer 33

Squall lines

Question 34

How can you determine the stability of the atmosphere?

Answer 34

The lapse rate

Question 35

The jet stream is a

Answer 35

A meandering river of high speed air between 50-200 knots in the tropopause. Jet Stream wind speed is greater on the polar side. Can be observed on an observed tropopause chart

Question 36

In winter, the jet stream

Answer 36

gets stronger and moves southward

Question 37

What is clear air turbulence?

Answer 37

High level wind shear turbulence. Develops in the turbulent energy between two air masses, a trough on the polar side of the jet stream, or around mountain waves

Question 38

What are trade winds?

Answer 38

northeasterly winds that blow out of subtropical high pressure zones over ocean areas

Question 39

Your alternate is 20NM away, a 10NM diameter thunderstorm is over the primary field. wind are blowing storm at 40kn., you have 35 min holding gas, WDYD?

1. shoot approach
2. Divert ASAP
3. Hold because you expect storm to pass

Answer 39

3. Hold because you expect storm to pass