Surface

Theta-E

Theta-E or Equivalent potential temperature, is the temperature of an air parcel (in Kelvin) if it were to release all of its moisture and then was brought adiabatically to sea level. While theta-e is usually utilized to determine the stability of the atmosphere by comparing readings at various pressure levels, it can be used at the surface to locate moisture tounges and moisture advection. During warmer months, severe weather outbreaks often occur at the end of a theta-e "tounge."