MET - Stability

What is it called when air continues to move away from its original position after being disturbed?

• Positively Stable

• Negatively stable

• Neutrally stable

• Convection stability

What is a parcel of air that is forced up a hill and then returns to a lower altitude after crossing the ridge called?

• Stable

• Unstable

• Neutrally stable

• Negatively stable

What does the stability of air mainly depend on?

Select all that apply

• Temperature lapse rate of the air

• Elevation of the terrain

• Adiabatic lapse rate

• Wind strength

What is Environmental Lapse Rate?

• 1.5 degrees per 1000ft

• Temperature increasing with height due to an inversion, fixed figure

• Temperature reducing with height due to pressure reducing, at 30º fixed figure

• Temperature reducing with height due to warming from below, not a fixed figure

Which has the steepest ELR?

• Orange

• Blue

• Red

• Impossible to tell

What is the DALR?

• 1.5 degrees / 1000ft

• 2 degrees / 1000ft

• 3 degrees / 1000ft

• Not a fixed value

When will dry air be stable?

• ELR = 1 degree per 1000ft

• ELR = 5 degrees per 1000ft

• ELR = 3 degrees per 1000ft

• SALR = 1.5 degrees per 1000ft

Which is the steepest ELR?

• 1 degree per 1000ft

• 2 degree per 1000ft

• 3 degree per 1000ft

• 4 degree per 1000ft

What is the SALR?

• 1.5 degrees per 1000ft

• 2 degrees per 1000ft

• 3 degrees per 1000ft

• Not a fixed value

ELR is 2 degrees per 1000ft. Is the saturated air stable or unstable?

• Stable

• Unstable