Polar regions are key components in the development of the global circulation system and therefore the impact of Arctic on European climate is beyond doubt. Moreover recent studies show that the sea ice is playing bigger role than it was assumed before, i.e. there seems to be negative correlation between sea ice concentration and strength of high pressure system over Siberia in winter (Wu et al, 2011). Furthermore, extended-range (11-30 days) weather forecasts are of high interest but are still not very accurate. To investigate if the error of the extended-range weather forecasts could origin in the Arctic, numerical experiments applying relaxation technique, also called nudging were done. Prognostic variables of the atmospheric circulation model were corrected by the observational data reducing the error of the forecast in the relaxation region. Applying the relaxation technique to the Arctic shows that the better knowledge of this region indeed improves the quality of the weather forecast therefore there must be a link between the Arctic and Europe. However, this link strongly depends on the time of the year and investigated region.