Superadiabatic Lapse Rate: when the environmental lapse rate exceeds the dry adiabatic rate; absolute instability such as this is usually limited to a very shallow layer near the ground on hot, sunny days; deep layers in the atmosphere are seldom, if ever, absolutely unstable; on rare occasions when the environmental lapse rate exceeds about 3.4 degrees C per 100m (autoconvective lapse rate), convection becomes spontaneous, resulting in the automatic overturning of the air

Superadiabatic Lapse Rate: when the environmental lapse rate exceeds the dry adiabatic rate; absolute instability such as this is usually limited to a very shallow layer near the ground on hot, sunny days; deep layers in the atmosphere are seldom, if ever, absolutely unstable; on rare occasions when the environmental lapse rate exceeds about 3.4 degrees C per 100m (autoconvective lapse rate), convection becomes spontaneous, resulting in the automatic overturning of the air

Unstable Atmosphere: ex: the environmental lapse rate is 11 degrees C per 1000 m; a rising parcel of unsaturated air will cool at the dry adiabatic rate; because the dry adiabatic rate is less than the environmental lapse rate, the parcel will be warmer than the surrounding air and will continue to rise, constantly moving upward away from its original position; a parcel of saturated air cooling at the lower moist adiabatic rate will be even warmer than the around it

Unstable Atmosphere: ex: the environmental lapse rate is 11 degrees C per 1000 m; a rising parcel of unsaturated air will cool at the dry adiabatic rate; because the dry adiabatic rate is less than the environmental lapse rate, the parcel will be warmer than the surrounding air and will continue to rise, constantly moving upward away from its original position; a parcel of saturated air cooling at the lower moist adiabatic rate will be even warmer than the around it

Conditionally Unstable Atmosphere: occurs whenever the environmental lapse rate is between the moist adiabatic rate and the dry adiabatic rate; the average lapse rate in the troposphere is about 6.5 degrees C per 1000m; since this value is between the dry adiabatic rate & average moist rate, the atmosphere is ordinarily in a state of conditional instability

Conditionally Unstable Atmosphere: occurs whenever the environmental lapse rate is between the moist adiabatic rate and the dry adiabatic rate; the average lapse rate in the troposphere is about 6.5 degrees C per 1000m; since this value is between the dry adiabatic rate & average moist rate, the atmosphere is ordinarily in a state of conditional instability

What Are the Two Types of Lapse Rate? : Aerographers Mate 3rd Class Robert Mason of Chicago, IL, releases a weather balloon from the fantail of the USS Harry S. Truman September 26, 1999.

What Are the Two Types of Lapse Rate?

What Are the Two Types of Lapse Rate? : Aerographers Mate 3rd Class Robert Mason of Chicago, IL, releases a weather balloon from the fantail of the USS Harry S. Truman September 26, 1999.

Neutral Stability: if the lapse rate is exactly equal to the dry adiabatic rate, rising or sinking unsaturated air will cool or warm at the same rate as the air around it; at each level, it would have the same temperature and density as the surrounding air; this air tends neither to continue rising nor sinking, so the atmosphere is neutrally stable; for saturated air, neutral stability exists when the environmental lapse rate is equal to the moist adiabatic rate

Neutral Stability: if the lapse rate is exactly equal to the dry adiabatic rate, rising or sinking unsaturated air will cool or warm at the same rate as the air around it; at each level, it would have the same temperature and density as the surrounding air; this air tends neither to continue rising nor sinking, so the atmosphere is neutrally stable; for saturated air, neutral stability exists when the environmental lapse rate is equal to the moist adiabatic rate

Lapse rate - Wikipedia, the free encyclopedia

Lapse rate - Wikipedia, the free encyclopedia

Adiabatic lapse rate: Dry= 10 C, Wet= 5

Adiabatic lapse rate: Dry= 10 C, Wet= 5

Causes of Atmospheric Instability: becomes more unstable as the environmental lapse rate steepens or as the air temperature drops rapidly with increasing height; this circumstance may be brought on by either air aloft becoming colder or the surface air becoming warmer; the cooling of air aloft may be due to: 1) winds bringing in colder air (cold advection) 2) clouds or air emitting infrared radiation to space (radiational cooling)

Causes of Atmospheric Instability: becomes more unstable as the environmental lapse rate steepens or as the air temperature drops rapidly with increasing height; this circumstance may be brought on by either air aloft becoming colder or the surface air becoming warmer; the cooling of air aloft may be due to: 1) winds bringing in colder air (cold advection) 2) clouds or air emitting infrared radiation to space (radiational cooling)

Adiabatic Lapse Rate (Orographic lifting/rain shadows)

Adiabatic Lapse Rate (Orographic lifting/rain shadows)

Atmospheric Mixing: the environmental lapse rate before mixing is less than the moist rate and the layer is stable; if the air in the layer is mixed either by convection or by wind-induced turbulent eddies, the air is cooled adiabatically as it is brought up from below and heated adiabatically as it is mixed downward

Atmospheric Mixing: the environmental lapse rate before mixing is less than the moist rate and the layer is stable; if the air in the layer is mixed either by convection or by wind-induced turbulent eddies, the air is cooled adiabatically as it is brought up from below and heated adiabatically as it is mixed downward

Buoyant Force: an upward-directed force; an air parcel in an unstable atmosphere, being warmer and less dense than its surroundings has a buoyant force acting on it; the warmer it is compared to its surroundings, the greater the buoyant force and the more rapidly the air parcel rises; absolute instability results when the environmental lapse rate is greater than the dry adiabatic rate

Buoyant Force: an upward-directed force; an air parcel in an unstable atmosphere, being warmer and less dense than its surroundings has a buoyant force acting on it; the warmer it is compared to its surroundings, the greater the buoyant force and the more rapidly the air parcel rises; absolute instability results when the environmental lapse rate is greater than the dry adiabatic rate

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Föhn or Foehn-- is a type of dry, warm, down-slope wind that occurs in the lee (downwind side) of a mountain range.  Föhn can be initiated when deep low pressures move into Europe drawing moist Mediterranean air over the Alps.It is a rain shadow wind that results from the subsequent adiabatic warming of air that has dropped most of its moisture on windward slopes. As a consequence of the different adiabatic lapse rates of moist and dry air, the air on the leeward slopes becom

Föhn or Foehn-- is a type of dry, warm, down-slope wind that occurs in the lee (downwind side) of a mountain range. Föhn can be initiated when deep low pressures move into Europe drawing moist Mediterranean air over the Alps.It is a rain shadow wind that results from the subsequent adiabatic warming of air that has dropped most of its moisture on windward slopes. As a consequence of the different adiabatic lapse rates of moist and dry air, the air on the leeward slopes becom

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