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ATPL 050 - Atmospheric Stability

Surface Temp (T)25°C
Dew Point (Td)15°C
ELR (Environment)2.5°C/1000ft
Conditionally Unstable

SALR < ELR < DALR: Stable dry, unstable saturated.

LCL
4,000ft
0°C Level
10,000ft
Temperature Profile
15000ft12000ft9000ft6000ft3000ft0ft
-20°C-10°C0°C10°C20°C30°C40°CISADALRSALRELRLCL0°C
DALR 3°C/1000ft
Dry air rising
SALR ~1.5°C/1000ft
Saturated air (releases latent heat)
ELR 2.5°C/1000ft
Actual environment (variable)