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or as a vertical profile where:

  • profile: the result of a vertical profile extraction from GRIB or BUFR with the thermo_grib() or thermo_bufr() functions, respectively.

The start conditions of the parcel are defined via the start_condition definition that :can specify these four different modes:

ModeDefinition

Surface

The parcel is started from the surface, i.e. the lowest point of the profile

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.

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Code Block
(mode: 'surface')

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(mode: 'surface')

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Custom
The parcel is started from the given temperature, dewpoint and pressure.

 Code Block
languagepy
(mode: 'custom',
t: start_temperature, 
td: start_dewpoint,  
p: start_pressure)

Mean layer
The parcel is started from the mean temperature, dew point and pressure of a given pressure layer.
Please note that when p_bottom is omitted the layer starts at the surface.

 Code Block
languagepy
(mode: 'mean_layer',
p_top: layer_top,
p_bottom: layer_bottom )

Most unstable
The parcel is started from the most unstable condition. To determine this, a parcel is started from all the points along the profile in a specified pressure layer. The staring position of the parcel resulting in the highest CAPE value define the most unstable start condition.
Please note that when p_bottom is omitted the pressure layer starts at the surface.

 Code Block
languagepy
(mode: 'most_unstable',
p_top: layer_top,
p_bottom: layer_bottom )


The result_dewpoint,  p: start_pressure)