The synoptic analyses of two different tornado cases, observed in Latvia and Poland in the summer of 2012,
are examined in this paper. The first of them, the tornado in Latvia seemed to be a “textbook example” of tornado
occurrence. Its development took place in the contact zone of the warm, tropical air, characterized by a very high
CAPE (Convective Available Potential Energy), with cold and moist polar marine air mass behind the convergence
line that determined very good conditions for convective updraft. Additionally, the moderate environmental wind
shear favoured the sufficient condition for concentrating the atmosphere’s vorticity into well-organized strong rotating
upward motions that produced the supercell structures and tornado. Thus, from the forecaster’s point of view, the
occurrence of this severe convective event was not a surprise. This phenomenon was predicted correctly more than a
dozen hours before the tornado occurred.
The second event occurred in the north of Poland and was associated with a thunderstorm where a supercell was
formed in conditions of low CAPE but favourable wind profile, both vertical and horizontal. Helical environments
(characterized by large shear vectors that veered with height in the lowest three kilometres, especially the nearest
one kilometre) were arguably the most important factor that determined the Polish tornado’s occurrence. In this case
the analysis of the synoptic situation was not so clear and the superficial analysis, even post factum, regarding radar,
satellite or detection maps might have suggested “quite a normal” summer thunderstorm. However, the detailed
examination showed the reasons why tornado genesis took place. The potential conditions for the occurrence of this
severe phenomenon were indicated by forecasters, although the forecasts were less exact with regard to the place of
occurrence and the heaviness of the strike.
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