Amesohigh (sometimes called a "bubble high")[1] is amesoscalehigh-pressure area that forms beneaththunderstorms. While not always the case, it is usually associated with amesoscale convective system.[2] In the early stages of research on the subject, the mesohigh was often referred to as a "thunderstorm high".[3]
A mesohigh forms underneath thedowndraft in asquall line and is associated with thecold pool of a thunderstorm. It is largely formed byhydrostatic phenomenon, specifically theevaporation of fallingprecipitation.[4] As precipitation, primarilyrain, falls in the downdraft, it evaporates in theunsaturated air, leading to cooling in the downdraft due to an absorption oflatent heat. The cooling of the air leads to an increase in the pressure as the air becomes denser.[5] While not the primary mechanism behind the mesohigh, melting orsensible cooling ofhail can also lead to increased pressure in the mesohigh.[6]
An additional source of increased pressure ishydrometeor loading, the weight of precipitation increasing the speed of the downdraft, leading to increased pressure as the air converges at the surface.[7] While hydrometeor loading is not a main contributor of increased pressure to the mesohigh, and it is a non-hydrostatic process, it can increase the pressure as much as 2 mb.[8]
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