A dangerous heat dome is expected to sweep across Europe in the coming days. Experts warn that this heat dome could cause devastating forest fires as it sweeps across Europe. Alarming weather maps indicate that many countries, including France, Germany and Italy, will struggle with extreme temperatures from this week. Extreme temperatures combined with low precipitation levels will create favourable conditions for forest fires. Heat domes are formed when a high pressure dome is atmospherically trapped in a region. The situation, which is likened to covering the lid of a boiling pot, causes high temperatures in the region where it is effective.