What is the potential temperature (theta) for the air parcel at 700 hPa in
this example?
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Theta (700 hPa) = 19°C = 292K.
From the temperature at 700 hPa, follow a
dry adiabat down to 1000 hPa, where the value of the isotherm is 19°C = 292K = potential temperature (theta).