Aviation Weather Flashcards
What two additional ingredients does natural air have that dry air does not
Condensation nuclei
Water vapor
Between the 30 and 60 North latitude is primarily where the US is located. What is the prevailing wind direction?
Westerly
In which layer of the atmosphere does weather occur?
Troposphere
What is a CP?
Continental polar
What are the characteristics of a CP
Dry cold air
Explain the difference between convection and advection
Convection vertical
Advection horozontal
In late evening, a thick layer of clouds have moved over your airfield. Will a nocturnal inversion happen this evening? Why or why not?
No the clouds will prevent an inversion from happening by keeping a warmer air near the surface
Define sea level pressure in two units of measurement
29.92 in Hg and 1013.2 mb
How is change in pressure depicted on a weather chart?
Isobars which are 4 mb apart
All fronts are low pressure T/F?
True
What determines wind soeed
Pressure gradient force - changes in pressure
You’re on a true course of 10° and wind is from 280. What type of weather conditions should you expect?
Lousy, poor
You’re departing Denver with an altimeter setting of 30.22. you arrive at New Orleans with an altimeter setting of 30.00 you failed to reset your altimeter is your true altitude higher or lower than indicated?
Lower
How is flight performance affected by moisture in the atmosphere
Less air density equals higher density altitude equals reduction in lift and reduction in engine performance
Which three atmospheric conditions provide for best lift?
High pressure low temp low humidity
Level of condensation or lifted condensation level
An altitude to which the air must be lifted for condensation to take place. Cloud will form at this altitude. Temperature and dew point are the same.
What kind of cloud did you expect at low altitude in an unstable environment?
Cumuliform clouds
What kind of cloud would you expect at low altitude in a stable environment?
Stratiform clouds
During stage field training and frontal passage what would you expect to happen to wind direction
An approx 90 deg shift in wind direction and speed based upon current pressure gradient force
What happened as warm air is lifted over a cold air mass
Lifts cools with altitude condenses creates clouds makes weather
Over the past several hours, the altimeter setting at kozr has been decreasing. Now after listening to atis you notice the setting has increased. The wind is now blowing from the Northwest and the outside air temperature is showing a lower temperature. What has happened at koqzr?
A cold front has passed
The cold front is moving faster than previously forecast. What type of weather would you expect ahead of the front?
Squall line formation
The entire local area is covered in st ns and as clouds. What type of front is occurring?
Stable warm front
You are approaching the clouds in the following order cs as and NS. what changes in ceiling visibility and chance of precipitation can you expect?
Ceiling and visibility decreasing chance of precipitation increasing
Why is the occluded front considered more complex than the others?
It is a combination of both cold and warm front weather
