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Front: the transition zone or boundary between 2 air masses of different densities caused by temp differences; usually separate air masses w/ contrasting temps; often separate air masses w/ different humidities; air masses have both horizontal & vertical extent, so the upward extension of a front is a frontal surface or a frontal zone
In meteorology, a heat burst is a rare atmospheric phenomenon characterised by gusty winds and a rapid increase in temperature and decrease in dew point (moisture). Heat bursts typically occur during night-time and are associated with decaying thunderstorms. Although this phenomenon is not fully understood, it is theorized that the event is caused when rain evaporates (virga) into a parcel of cold dry air high in the atmosphere making the air denser than its surroundings.
Entrainment occurs when a turbulent flow captures a non-turbulent flow. It is typically used to refer to the capture of a wind flow of high moisture content, or in the case of tropical cyclones, the capture of drier air. Entrainment is the mixing of environmental air into a preexisting air current or cloud so that the environmental air becomes part of the current or cloud. The entrainment coefficient in clouds is one of the most sensitive variables causing uncertainty in climate models.
Vapor Pressure: the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases (solid or liquid) at a given temperature in a closed system; an indication of a liquid's evaporation rate; the total pressure inside a parcel is due to the collision of all the molecules against the inside surface of the parcel; total pressure inside is equal to the sum of the pressures of the individual gases (Dalton's law of partial pressure)