Originally Posted by ShyTorque
Surely,
DALR = 3 degrees / 1000 ft
SALR = 2 degrees / 1000 ft
Both of the above relate to the ISA.
ELR = somewhere between the two, what you actually get on the day.
Back to the met books for you, Shy Torque. That's almost complete tosh.
DALR ... correct.
SALR ... almost always incorrect, but unlike DALR it is a variable and depends on the amount of vapour condensed. At low levels in temperate climates it is around 1.5 degC per 1000 feet, which is the figure that tends to be used in the UK. It can be around 1 degC in the warm saturated air of tropical regions and can be (here's where your value may on the odd occasion be correct) 2 degC or more per 1000 feet where the temperature is below freezing.
DALR and SALR relate to the ISA ... no they don't!
ELR is somewhere between DALR and SALR ... not necessarily, indeed if this were the case unsaturated air could never be unstable - and that would transform our weather patterns!