What Set Of Conditions, Working Together, Will Make The Atmosphere The Most Unstable?

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What two conditions working together make the atmosphere the most unstable?

Sunlight warms the ground and the air next to it during the day. This steepens the environmental lapse rate and makes the atmosphere more unstable.

What processes cause the atmosphere to become more unstable?

Low level instability can be rapidly brought about by warm air advection along with moisture advection (bringing of a warm and humid airmass into the lower troposphere). Cooling the middle and upper levels of the troposphere causes the troposphere to become more unstable.

Which of the following conditions would lead to unstable air?

To be “unstable” the lowest layers of an air mass must be so warm and/or humid that if some of the air rises then that air parcel is warmer than its environment and so it continues to rise. … This condensation releases heat which warms the air parcel which can cause the parcel to rise higher still.

What makes an environment unstable?

The atmosphere is considered to be unstable if a rising parcel cools more slowly than the environmental lapse rate. This causes the air parcel to remain warmer and less dense than its surroundings and therefore continue to accelerate upward.

What is atmospheric stability and instability?

Stability is the state in which an air parcel finds itself colder than the air surrounding it at the same pressure (elevation). … Instability is the state in which an air parcel finds itself warmer than the air surrounding it at the same pressure (elevation).

What is a conditionally unstable atmosphere?

The atmosphere is said to be conditionally unstable if the environmental lapse rate is between the moist and dry adiabatic lapse rates. This means that the buoyancy (the ability of an air parcel to rise) of an air parcel depends on whether or not it is saturated.

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How can a conditionally unstable atmosphere become unstable?

If you cause dry air to rise its temperature will drop due to adiabatic expansion. This vertical temperature gradient is called the dry adiabatic lapse rate. When the temperature gradient becomes sharper than this (i.e. the temperature drops sharply as altitude increases) the atmosphere becomes unstable.

What is stable and unstable air?

Stable air means that the weather is likely to be calm. … It may rain or snow slowly and steadily it may be sunny but the weather will not change quickly. Unstable air means that the weather might change quickly with very little warning. Unstable air leads to sudden thunderstorms.

What are the characteristics of an unstable atmosphere?

What are characteristics of unstable air? Turbulence and good surface visibility. Explanation: It is easy to associate turbulence with unstable air. B is incorrect because stable air usually contains dust or smoke which will cause low visibility.

Which condition below could make a layer of air more unstable?

When a layer of air is forced to rise it tends to become more unstable because the top layer cools more rapidly than the bottom. This steepens the environmental lapse rate. This effect is enhanced even more when the lower layer of the lifted parcel is moist and the upper layer is dry.

What are the conditions that determine atmospheric stability?

Three characteristics of the sounding then determine the stability of the atmospheric layer in which the parcel of air is embedded. These are: (1) The temperature lapse rate through the layer (2) temperature of the parcel at its initial level and (3) initial dew point of the parcel.

How does atmospheric stability affect air pollution?

Atmopsheric Stability

An unstable atmosphere enhances turbulence whereas a stable atmosphere inhibits mechanical turbulence. The turbulence of the atmosphere is by far the most important parameter affecting dilution of a pollutant. The more unstable the atmosphere the greater the dilution.

What makes the atmosphere stable or unstable?

What makes air stable or unstable? It is the vertical profile of temperature or lapse rate of the atmosphere which determines whether an air mass is stable or not. The temperature can be measured using an electronic thermometer attached to a helium-filled weather balloon released from the ground.

What is a stable atmosphere and how can it form?

What is a stable atmosphere and how can it form? The atmosphere is stable when the environmental lapse rate is small. Consequently the atmosphere tends to become more stable as the air aloft warms or the surface air cools. Describe the general characteristics of clouds associated with stable and unstable atmospheres.

What is the atmospheric stability conditions responsible for looping plume Behaviour?

A. Looping plume: It takes place when the atmosphere is very unstable wind speed is greater than 10 ms-1 has super-adiabatic lapse rate and is accompanied with solar heating.

What are the causes of atmospheric stability and instability?

One way that air (on small scales) can become warmer than immediately surrounding air and rise spontaneously occurs when air is in contact with say sun-heated ground or an ocean surface warmer than the air is. That air will generally be heated by conduction more in some spots than in others.

What is stable unstable and neutral environment?

A stable atmosphere will tend to resist vertical motion while an unstable atmosphere will assist it. When the atmosphere neither resists nor assists vertical motion it is said to have neutral stability. Vertical motion and instablity are responsible for atmospheric turbulence and cloud formation.

What is condition instability?

Atmospheric condition in which otherwise stable air on being forced to rise (e.g. over an orographic barrier) cools at a rate less than that at which the temperature drops with height in the surrounding air. The rising air therefore becomes warmer than the surrounding air and so continues to rise.

What is potential instability?

potential instability(convective instability) An atmospheric condition in which otherwise stable air would become unstable if forced to rise (e.g. over high ground) thereby reaching its saturation point. Large cumulus with much precipitation often results from the forced uplifting of such air.

What is conditional instability geography?

The state of a layer of unsaturated air when its lapse rate of temperature is less than the dry-adiabatic lapse rate but greater than the moist-adiabatic lapse rate.

What determines whether air conditionally unstable will become buoyant?

What will determine whether air that is conditionally unstable will become buoyant? If a parcel is forced high enough to stimulate cooling at both the dry and wet adiabatic lapse rates then eventually the parcel will become warmer than the ambient air.

When the atmosphere is absolutely unstable the environmental lapse rate is?

Absolutely unstable : if the environmental lapse rate is greater than 9.8 C per kilometer (i.e. greater than the dry adiabatic rate) then any rising parcel saturated or not will be warmer than it’s envirnoment. The parcel will be buoyant in this case and so the atmosphere is characterized as absolutely unstable.

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What type of clouds are characterized as unstable air and what type of weather is associated with this type of atmospheric condition?

Clouds forming in such unstable environments are of the cumulus variety which as you may recall means “heap cloud.” Cumulus clouds are “heap clouds ” and have a bubbly or billowy appearance.

How does unstable air create thunderstorms?

Unstable air forms when warm moist air is near the ground and cold dry air is above. Lift comes from differences in air density. It pushes unstable air upward creating a tall thunderstorm cloud.

What is unstable air aviation?

An unstable atmosphere is one in which rising air will remain warmer than the surrounding atmosphere as it rises.

What conditions cause an unstable air mass?

Air is considered unstable in the lowest layers of an air mass when the air is warmer and or more humid than the surrounding air. When this occurs the air will rise as that air parcel is warmer than the air surrounding it. In an unstable environment the weather can change suddenly and can be violent.

What is an indicator of a stable atmosphere?

Visual indicators of stable atmospheric conditions: o Smoke layer. o Stratus clouds or fog. o Low intensity fire as a result of suppressed vertical motion and weak inflow wind to feed fire new oxygenated air.

What are typical characteristics of stable air?

Stable air masses are also characterized by smooth undisturbed air. This quality can be seen mainly by pilots or air travelers. People flying through stable air masses will not experience violent turbulence or disturbances as they would in unstable air masses.

What weather conditions would lead you to believe that air is unstable stable?

What weather condition would lead you to believe that air is stable? when air rises and cools to its dew-point temperature by the process of adiabatic cooling. When a parcel of air ascends it passes through regions of successively lower air pressure causing the parcel to expand and cool adiabatically.

How is it possible for a layer of air to be convectively unstable and absolutely stable at the same time?

How is it possible for a layer of air to convectively unstable and absolutely stable at the same time? … develops when a widespread layer of air descends. The layer is compressed and heated by the resulting increase in atmospheric pressure and as a result the lapse rate of temperature is reduced.

What type of weather is associated with unstable air choose all that apply?

Describe the weather associated with unstable air. Unstable air tends to generate thunderstorms towering clouds and possibly tornadoes.

What are the three different criteria of atmospheric stability?

The variables are: pressure (P) temperature (T) mixing ratio (r) saturated mixing ratio (rs) potential temperature (θ) and wet-bulb potential temperature (θw).

During which stage of a thunderstorm is the atmosphere most unstable?

Mature. The mature stage the most active stage of the thunderstorm cycle begins when lightning and thunder are first observed. A strong updraft and downdraft will also form within the thunderstorm cloud during this stage.

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How do you measure atmospheric instability?

They can arrive at the same answer simply by measuring the actual air temperature at various heights this measure is called the environmental lapse rate (the term “lapse” having to do with temperature’s decline). If the environmental lapse rate is steep then one knows the atmosphere is unstable.

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