Atmospheric Conditions

Exosphere Outer layer

Thermosphere 280,000' - 1,848,000'

Mesosphere 160,000' - 280,000'

Stratosphere 36,000' - 160,000'

Troposphere SFC - 36,000'

• The atmosphere's resistance to vertical motion

Stable Air

• Limited vertical motion, sinking air

• Smooth air, less cloud development

• Visibility limited by fog, haze, smoke

Unstable Air

• Vertical motion, rising air

• Turbulent air, cloud development

• Good visibility

Temperature Lapse Rate

• 2ºC per 1,000' gain (to 36,000')

Pressure Lapse Rate

• 1"Hg per 1,000' gain (to 10,000')