engleski

Adriatic vortex generation observed during MAP SOP and predicted by the mesoscale ALADIN/LACE model

The genesis of the Adriatic vortex and its prediction during the Mesoscale Alpine Program - Intensive Observation Period (MAP IOP) 4-5 October 1999 has been observed and this prediction is presented based on the high resolution ALADIN/LACE model. The model simulation shows that the vortex owes its existence to the Alpine circulation, similar to the one usually responsible for the large-scale lee cyclogenesis. However, the Alpine mesoscale wind field predicted three main currents following the upstream blocking and splitting processes. Two of them, around the western and eastern side of the Alps, are known from the macroscale analyses, and the third belongs to the mesoscale, appearing as an Alpine valley transverse current toward the Genoa bay. This circulation initiates the local wind systems, bora in the northern and jugo in the southern Adriatic, resulting in the generation of a mesoscale vortex after 36 - 42h prediction time. Another case in the following month (7 November 1999) is also illustrated when, in contrast, the Adriatic vortex was not generated by a similar type of circulation. It is shown that in this case the predicted Alpine currents are stronger, especially on the eastern side of Alps, and result in a macroscale cyclogenesis in the Tyrrhenian Sea.

Adriatic vortex; Mesoscale Alpine Programme; ALADIN model; cyclogenesis; bura; jugo

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