The influence of hail suppression by silver iodide seeding on the trend in the number of hail days (the hail trend) in Vojvodina was studied in two cases; (1) from 1967 to 2002 when there was no hail suppression and (2) from 2003 to 2010 when hail suppression existed on the whole territory. The hail trend in Vojvodina was calculated on the basis of all observed data from all synoptic and climatological stations in the period 1967 to 2010. Previous two cases show that the hail trend was increasing when there was hail suppression. Obtained results are not in accordance with the expectation that hail suppression decreases hail in Vojvodina.

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Out of all atmospheric processes on the planets of the Solar System, special attention will be devoted here to leading circulation of planetary or global scales, known as Rossby waves. These waves occur in all rotating fluids that have relative movement to the rotation system. Rossby waves exert dominant influence on so-called global weather. Based on the knowledge of some properties of Rossby waves are made approximate analysis of weather conditions on the planets of the Solar System. Also, these considerations can serve as an introduction to weather forecasting on the planet.