References - P-3030034

CHAPTER TWO

AVIATION WEATHER

2.14 Explain and identify gradient winds with respect to the isobars around high and low

pressure systems in the Northern Hemisphere.

2.15

Define Buys Ballot's Law.

2.16 Explain and identify the surface wind direction with respect to the gradient winds in a

high and low-pressure system in the Northern Hemisphere.

2.17

Describe the jet stream.

2.18

Describe sea breezes and land breezes.

2.19

Describe valley and mountain winds.

2.20

Define saturation, dew point temperature, dew point depression, and relative humidity.

2.21 State the relationships between saturation, air temperature, dew point temperature, and

dew point depression necessary for the formation of clouds, fog, and precipitation.

2.22

Describe the three characteristics of precipitation.

2.23

Describe the types of precipitation.

2.24

Identify the four principal cloud groups.

2.25

Identify the weather conditions associated with various clouds and types of precipitation.

2.26

Describe atmospheric stability, instability, and neutral stability.

2.27

Describe the four types of lifting.

2.28 Identify the flight conditions associated with a stable and unstable atmosphere including

cloud type, turbulence, precipitation, visibility, winds, and icing.

202.

REFERENCES

Weather for Air Crews, AFH 11-203, Volume 1, Chapters 2, 5, 6, and 9

203.

STUDY ASSIGNMENT

Review Chapter Two and answer the Study Questions.

204.

WINDS

Understanding the causes of wind and wind direction is essential to the safe operation of an

aircraft. Takeoffs and landings are best performed into a headwind, whereas landing with a

2-2 Atmospheric Mechanics of Winds, Clouds and Moisture, and Atmospheric Stability