engleski

Longitudinal roll vortices in the bora wind

The bora downslope windstorm dynamics has been studied at several different scales, ranging from the synoptic scale, through various mesoscales, where the interaction with mountains occurs that generates jets and wakes and the related PV banners, wave breaking and rotors, down to turbulence scales and wind gusts. However, a rather narrow range of scales has been overlooked despite a large body of previous studies. Our results indicate that bora generates longitudinal roll vortices above the Adriatic Sea with the wavelength of about 1 km. The bora flow setup is ideal for the formation of rolls - cold air outbreak over the relatively warm sea, with moderate to strong winds and wind shear. It thus comes as a surprise that rolls have not been assumed nor reported in previous bora literature. The most likely cause of this omission is the absence of the distinctive clouds streets that are usually associated with the roll vortices. This study examines the characteristics of the bora rolls observed by the Electra aircraft on 07 November 1999 during the MAP experiment.

MAP experiment; Bora wind; Longitudinal vortices

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