Environmental
Lapse Rate (ELR)
ELR is the Temp change with height that is
recorded by a weather balloon
ELR is absolutely unstable in a thin
layer just above the ground
on hot, sunny days
Ahrens, Meteorology Today 5th Ed.
ELR is 6.5o C/km, on average, and
thus is conditionally unstable!
6.0o C/km
10.0o C/km
6.5o C/km
