Meteorology Flashcards
How does pressure change with height in the lowest layers of the troposphere?
Decreases by 1hPa per 30ft.
Where is the tropopause the highest?
Near the equator
Deposition refers to…
A change in state from gas to a solid.
What is the height of the tropopause in the ISA?
36.090ft
In ascending order, what are the layers of the atmosphere?
Troposphere, stratosphere, mesosphere, thermosphere.
What does 05/05 mean in a METAR?
Temp 5 degrees, dew point 5 degrees, RH 100%.
What is an inversion?
A layer where temperature increases with height.
What is a layer where temp is constant with height?
Isothermal Layer
What is the DALR?
Dry Adiabatic Lapse Rate - 3C per 1000ft
What is the SALR?
Saturated Adiabatic Lapse Rate - 1.5C per 1000ft.
If the ELR was 2C per 1000ft, what would stability be?
Conditionally unstable (inbetween the DALR and SALR)
If warm air is cooled from below, what happens to the stability?
It becomes more stable.
Which way does Coriolis act in the Southern Hemisphere?
Left
If low pressure is on your left in the northern hemisphere, where will the wind be?
Behind you
If cool air is warmed from below, what will happen to stability?
The air will become unstable.
How do surface winds compare to winds at 2000ft?
Directions are backed and speeds reduced (backed and slacked).
Picture a wind arrow pointing down and to the right, with a flag and small line at the end. What does this indicate?
South-Easterly at 55kts.
What does 09010KT indicate in a METAR or TAF?
Wind from 090 degrees at 10 knots.
What is an effect of the Fohn effect to the Lee of high ground?
Higher cloud bases
Which of the following is likely to cause turbulence?
- Foehn Effect
- Coriolis Effect
- Thermals
- Mass Descent
Thermals
What does SCT200 stand for in a METAR or TAF?
3-4 Oktas at 20000ft
Name the trigger actions (to create cloud)
Convergence, Convection, Mass Ascent, Orographic uplift