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This paper is a case study of horizontal atmospheric rolls that formed overthe Black Sea on 16 August 2007. The rolls were discovered in WRF modelingresults for a mesoscale cyclone that originated over the sea on 15 August 2007.The roll formation mechanisms, such as Rayleigh-Benard convective instability,dynamic instability, advection and stretching of vertical velocity fieldinhomogeneities, are considered. It is shown that indeed convective instabilityplayed an important role in the roll formation but dynamic instability did notoccur. In order to distinguish other possible mechanisms of the roll formationnumerical experiments were performed. In these experiments sea surfacetemperature in the initial conditions was decreased in order to preventconvective instability. Even though convective instability was suppressedroll-like structures still appeared in the modeling results, although theirheight and circulation velocity were smaller than in the control run. It wasfound that these structures were caused by advection and stretching of verticalvelocity field inhomogeneities (i.e. small areas of strong updrafts ordowndrafts).

Numerical modeling of roll structures in mesoscale vortexes over the Black Sea