The United States and Europe are the meteorological forecasts indicate that a cold wave – but this is contrary to the assessment of the Munich Re is not the long-term trend of warmer Winter.

“In the future, we expect to have more mild winters, even if it can always be cold stages,” said the geoscientists Eberhard Faust, head of research for climate risks and natural hazards at the world’s largest reinsurers.

the cause for the impending cold weather in the coming week, an unusual weather situation. “In the Winter, a vortex that is enclosed by the jet stream and the cold air of quasi-constricts over the polar area, in the upper atmosphere, the stratosphere,” said Faust. “Now it may happen that the polar vortex is weakening, and the cold air from the polar region far to the South can penetrate.”

The operations in the high and near-ground atmosphere were coupled. “In the extreme case, this structure can be destroyed, so that the two daughter vortices are formed. Such a situation we currently have, with a subsidiary eddy in North America in the area over the Hudson Bay and a second over Western Siberia,” said Faust. In such a Situation, air outbreaks to the South to be Cold.

The Munich Re documented for decades, natural disasters and Geohazards around the globe, as this is for the risk assessment of the insurance industry is of great importance. The Expertise of the Munich-based professionals is also incorporated in the assessments of the IPCC.

So as it stands at the Moment, going to be the cold in the coming week, from 21. to 27. January and a minimum in the following week in the Eastern and Central Parts of North America. “In Parts of Europe, it can be according to the current predictions in the context of the destabilized polar vortex in the course of the coming weeks, much cooler,” said Faust.

the East coast of The United States is also expected to be a strong winter storm. “We have winter storms usually come from the West in connection with the milder temperatures because milder air masses transported from the Atlantic ocean. On the US East coast, however, there is the so-called North-East towers or Nor’easter,” said Faust. A cold storm wind coming from the North-East and could bring heavy snowfall in the coastal regions.

“Generally speaking, the Winter but also in the United States, particularly in the Western half, mild become,” said the scientist. In the North-East, the low temperatures showed, at least for the past four decades, an increase in trend. “In Central Europe, especially Germany, we see that the Winter in the long-term trend mild, and precipitation have become richer, and the number of the frost has decreased.”

dpa