THE ELR CONTROLS STABILITY.

€If the ELR is less than 0.6°C / 100 m, the air is stable – absolute stability.

Stable weather Bad visibility Nil to Light turbulence Stratiform cloud Intermittent to continuous precipitation DZ, -RA, RA, SN

€If the ELR is greater than 1°C/100 m, the air is unstable – absolute instability.

Unstable weather Good visibility (poor in showers) Moderate to severe turbulence Cumuliform cloud Showery precipitation SHRA, SHRA, GR, GS

 If the ELR is between 0.6°C and 1°C/100 m, the air is stable if dry and unstable if satu-rated – conditional instability.

 The clouds which form in stable air tend to be small in vertical extent and large in hori-zontal extent – layer clouds / stratiform cloud.
 The clouds which form in unstable air tend to be large in vertical extent and small in horizontal extent – heap clouds.

The ELR now matches the DALR meaning that dry parcels will be neutral. And no vertical movement 

DALR = ELR > SALR.

if a parcel of air was forced to rise in the atmosphere, the decreasing ambient pressure would cause the parcel to expand, much like an air bubble does when it rises through a champagne glass. As the air rises and expands, it will cool adiabatically.

THE ELR CONTROLS STABILITY.

 If the ELR is less than 0.6°C / 100 m, the air is stable – absolute stability.

Stable weather Bad visibility Nil to Light turbulence Stratiform cloud Intermittent to continuous precipitation DZ, -RA, RA, SN

 If the ELR is greater than 1°C/100 m, the air is unstable – absolute instability.

Unstable weather Good visibility (poor in showers) Moderate to severe turbulence Cumuliform cloud Showery precipitation SHRA, SHRA, GR, GS

 If the ELR is between 0.6°C and 1°C/100 m, the air is stable if dry and unstable if satu-rated – conditional instability.

 The clouds which form in stable air tend to be small in vertical extent and large in hori-zontal extent – layer clouds / stratiform cloud.

 The clouds which form in unstable air tend to be large in vertical extent and small in horizontal extent – heap clouds.

when air rises, it cools, but as it cools, condensation takes place which releases latent heat to the air parcel

Saturated air lapse rate is0.6°C per 100 m (1.8°C/1000 ft).

unsaturated or dry air has lapse rate 1°C per 100 m (3°C/1000 ft)

If the ELR is less than 0.6°C / 100 m,(6°c /1000m) the air is stable – absolute stability.

Stable weather Bad visibility Nil to Light turbulence Stratiform cloud Intermittent to continuous precipitation DZ, -RA, RA, SN

here the lapse rate is 2°c / 1000m

hence stable

If the ELR is between 0.6°C and 1°C/100 m, the air is stable if dry and unstable if satu-rated – conditional instability.

Air is stable whenever the ELR is less than 0.6°C/100m.

In inversion ELR is less than 0.6°C/100m.as temp increases with height

Air is stable whenever the ELR is less than 0.6°C/100m.

In isotherm ELR is equal to 0 .as temp remains same

Vertical windshear is change in wind velocity with height. It is typically measured in knots per 100ft. This type of windshear is very common during an inversion, therefore expect them at night and in well developed high pressure systems such as those found under the sub tropical high pressure belt. As an aeroplane fly’s through an inversion, not only will the change of temperature cause the engine performance to change, but the abrupt change in wind speed and direction may significantly alter the flight path.

if dry air is disturbed it will return to is original position, in other words the air is stable, however, when saturated air is disturbed it will continue to rise and it is unstable.

Saturated air that is either forced to rise or descend within the atmosphere will change its temperature, on average by 0.6°C per 100 m (1.8°C/1000 ft).

The SALR varies strongly with the moisture content, which when saturated, depends on temperature, and pressure of the air parcel.

dalr temp will increase 1°C per 100 m , it will heat up more than salr

Elr is not a fixed value

where as

Saturated air lapse rate is0.6°C per 100 m (1.8°C/1000 ft).

unsaturated or dry air has lapse rate 1°C per 100 m (3°C/1000 ft)

Saturated air that is either forced to rise or descend within the atmosphere will change its temperature, on average by 0.6°C per 100 m (1.8°C/1000 ft).

The SALR varies strongly with the moisture content, which when saturated, depends on temperature, and pressure of the air parcel.

dalr temp will increase 1°C per 100 m , it will heat up more than salr

Elr is not a fixed value

where as

Saturated air lapse rate is0.6°C per 100 m (1.8°C/1000 ft).

unsaturated or dry air has lapse rate 1°C per 100 m (3°C/1000 ft)

If the ELR is less than 0.6°C / 100 m, the air is stable – absolute stability.

Stable weather Bad visibility Nil to Light turbulence Stratiform cloud Intermittent to continuous precipitation DZ, -RA, RA, SN

 If the ELR is greater than 1°C/100 m, the air is unstable – absolute instability.

Unstable weather Good visibility (poor in showers) Moderate to severe turbulence Cumuliform cloud Showery precipitation SHRA, SHRA, GR, GS

an adiabatic process is a process in which no heat is transferred to or from a working fluid.

 If the ELR is less than 0.6°C / 100 m, the air is stable – absolute stability.

Stable weather Bad visibility Nil to Light turbulence Stratiform cloud Intermittent to continuous precipitation DZ, -RA, RA, SN

 If the ELR is greater than 1°C/100 m, the air is unstable – absolute instability.

Unstable weather Good visibility (poor in showers) Moderate to severe turbulence Cumuliform cloud Showery precipitation SHRA, SHRA, GR, GS

THE ELR CONTROLS STABILITY.

 If the ELR is less than 0.6°C / 100 m, the air is stable – absolute stability.

Stable weather Bad visibility Nil to Light turbulence Stratiform cloud Intermittent to continuous precipitation DZ, -RA, RA, SN

 If the ELR is greater than 1°C/100 m, the air is unstable – absolute instability.

Unstable weather Good visibility (poor in showers) Moderate to severe turbulence Cumuliform cloud Showery precipitation SHRA, SHRA, GR, GS

If the ELR is less than 0.6°C / 100 m,(6°c /1000m) the air is stable – absolute stability.

Stable weather Bad visibility Nil to Light turbulence Stratiform cloud Intermittent to continuous precipitation DZ, -RA, RA, SN

here the lapse rate is 2°c / 1000m

hence stable

If upper part has warm air that means temperature is increasing with height

and

If the ELR is less than 0.6°C / 100 m, the air is stable – absolute stability

here we have negative elr

If upper part has cold air that means temperature is decreasing  with height

and

If the ELR is greater than 1°C/100 m, the air is unstable – absolute instability.