It should be remembered that CAPE represents potential energy, and will only be used should a parcel be lifted to the level of free convection. When values are above 3500 j/kg and storms do develop, they may build rapidly and quickly become severe. Often these storms are referred to as "explosive storms" by chasers and professionals. In a high CAPE environment storms that develop can usually be seen by the human eye as rising rapidly. Chasers discussing these kind of storms have been overheard saying these storms resemble a nuclear explosion as in this photo, because they rise up so quickly and powerfully.
Joules Defined: Energy here is expressed in JOULEs (J). An energy of 1 joule is expended in moving an object through 1 meter when it is opposed by a force of 1 NEWTON. 1 Joule is equal to 1 Newton-meter. Energy is stored work, Work being the application of a force through a distance. Power is the rate of flow of energy, or the rate at which work is done. Stored energy becomes working energy when it is used.
CAPE is then expressed as: Joules J (Energy) /kg Per Kilogram (Mass)
NOTE: To get the full picture of severe weather potential CAPE should be used in conjunction with a full sounding. Also remember that CAPE when used to calculate (Wmax), is often over stated by as much as a factor of 2x.
For more details take a class on Buoyancy and CAPE by clicking here. This class room study requires flash player to be installed on your web browser. A teacher will explain step by step buoyancy and CAPE. The class is free online right now.
It should be remembered that CAPE represents potential energy, and will only be used should a parcel be lifted to the level of free convection. When values are above 3500 j/kg and storms do develop, they may build rapidly and quickly become severe. Often these storms are referred to as "explosive storms" by chasers and professionals. In a high CAPE environment storms that develop can usually be seen by the human eye as rising rapidly. Chasers discussing these kind of storms have been overheard saying these storms resemble a nuclear explosion as in this photo, because they rise up so quickly and powerfully.
Joules Defined: Energy here is expressed in JOULEs (J). An energy of 1 joule is expended in moving an object through 1 meter when it is opposed by a force of 1 NEWTON. 1 Joule is equal to 1 Newton-meter. Energy is stored work, Work being the application of a force through a distance. Power is the rate of flow of energy, or the rate at which work is done. Stored energy becomes working energy when it is used.
CAPE is then expressed as: Joules J (Energy) /kg Per Kilogram (Mass)
NOTE: To get the full picture of severe weather potential CAPE should be used in conjunction with a full sounding. Also remember that CAPE when used to calculate (Wmax), is often over stated by as much as a factor of 2x.
For more details take a class on Buoyancy and CAPE by clicking here. This class room study requires flash player to be installed on your web browser. A teacher will explain step by step buoyancy and CAPE. The class is free online right now.
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