Heat Burst

A heat burst is a feature sometimes found within strong thunderstorms, and is the result of compressional heating. This is a more common feature with decaying thunderstorms. Thunderstorms decay as rainfall suppresses updrafts, rendering the lifeblood of thunderstorms impotent. A heat burst is most common when the atmosphere is a little drier, as verga diminishes within the parcel aloft, making the parcel denser, but still relatively dry. The parcel will begin to descend as the water vapor will make it more dense than the thin upper level air. If the descending parcel can gain enough momentum, it will reach the surface as a relatively dry bundle of air. Since it is dry, it will be more capable to change temperature. An increase in pressure will lead to an increase in temperature, as we are told by the ideal gas law.
The potential temperature increase can climb as much as 40 degrees, and in some extreme cases even higher. Here is an example of a heat burst in Foraker, Oklahoma in 2014, showing the temperature and dew points through the day.
heat burst

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