Mountain Flying Flashcards
What type of cloud is CG
CUMULUS GRANIT
Grey / Very hard sides
What 2 conditions exist for mountain waves to occur
1. Wind speed
2. Wind direction
- Wind speed > 15kts
- Wind direction within 30॰ of right angle of mountain
Air flow over a mountain tops is likely to cause what as it flows away from the mountain
MOUNTAIN WAVES
What are the wind speeds likely to be aloft of a mountain and why
- Fast
- Venturi effect
Top of mountain acts like half of a venturi tube. Dynamic pressure increases, static pressure decreases
What happens to an altimeter aloft of a mountain and why
- Over reads (you think you are higher)
- Mountain acts like venturi - static pressure drops, dynamic pressure increases
Orographic cloud formation
If atmosphere stable, what cloud type will form aloft of a mountain
LAYER CLOUD
(Stratiform)
Orographic cloud formation
If atmosphere is unstable, what cloud type will form aloft of a mountain
HEAPED
(Cumuliform)
What type of clouds form at the peak of wave patterns
LENTICULAR
What cloud types form at lower levels downwind of the mountain
ROTOR CLOUD
(Roll cloud)
Lenticular clouds have high risk of ____ ?
Rotor clouds have high risk of ____ ?
- Icing
- Turbulence
Which side of a mountain/hill is warmer
LEE SIDE
Warm descending air is known as what
FOEHN WIND
What is terrain funnelling and an associated effect
Wind passing through 2 mountain ranges
Bernoullie effect
Wind speeds increase
Localised atmospheric pressure decrease (Altimeter over reads)
What causes katabtic wind
Air cooled at surface due to surface radiation
What causes anabatic wind
Air heated at surface rising
