Low Level Winds Flashcards
An anometer measures black at blank meres?
Wind -10 m
Hurricane force winds are winds above blank know
64
A squall is a gust lasting more than blank
1min
What is a gust?
Increase 10knots more than average.
When wind rotates anticlockwise, it is said to be blanking
Backing
When wind rotates clockwise, it is said to be blanking
Veering
▪ Friction Force (below 1,000 ft - x,000ft above the surface)
3000ft
What is a Foehn wind? It is an adiabatically heated wind blowing down a mountain side. The temperature on the lee side is normally higher/lower than on the windward side of the mountain at the same level.
Higher
What happens to wind if the pressure gradient remains constant in a high pressure system?
Increases
What happens to wind if the pressure gradient remains constant in a low pressure system?
Decreases
High to low look out blank
If an observer stands with their back to the wind the lower pressure is on their
left/right in the northern hemisphere
Left
Coriolis effect reduces and wind speed blanks.
Decreases
What happens to wind speed as you descended with the friction layer?
It decreases
Over land, as we descend , what degree of wind change occurs?
30
Back slack and crack
Why is there a sea breeze?
Land cools faster than ocean so rises.
Why does land breeze occur?
At night the sea is warm
Where does the bora occur and what is it?
Adriatic - cold air thats above 100kts
What is the name of the cold and dry air that is channeled through the alps in the south of france?
The mistral.
Whats the pampero?
Cold wind in south america.
Blank is key for the development of mountain waves
Stability.
True or false : mountain waves can exceed the structural capability of the aircraft.
True
You are approaching an airport located in strong wind conditions. The visual approach procedure requires you to fly into this wind through a valley on the final approach at 1500 ft.
When flying through the valley, the wind speed will (1) _____ due to convergence and the true altitude will be (2) _____ than the indicated altitude.
Increase less
Geostrophic wind is perpendicular/parallel to the horizontal pressure gradient force.
Perpendicular
