Sudden stratospheric warming the polar vortex split in two. The polar vortex is formed and deepened, when the atmosphere loses heat to space in the dark long winter nights in the Arctic, has been divided into two large parts is being reduced. A series of intense storms in the far northern part of the Pacific Ocean has increased to very long waves in the lower atmosphere. The energy of this, planetary-sized wave came up from the lower atmosphere over the Himalayas and the Tibetan plateau and broke into the stratosphere, causing a strong sudden warming.
It is very fast abolished strong cyclonic winds in the stratosphere around the pillar, creating a central dome, splitting into two smaller vortex. We see this division on the map, showing how high-altitude weather balloon rises and fixes a very low atmospheric pressure of 50 mbar. Standard atmospheric pressure is 1013mb.
Polar vortex, from 1 to 3 January. NOAA.
Polar vortex is divided into two (50 millibar height in meters) from January 10 to 13. NOAA.
Key stratospheric warming occurred, on average, each year for the past 50 years. The physics of these warming events is very difficult. Since 1998, the warming has been more frequent and occurred in early winter. Previously, the main warming usually occurred in February. Over the last ten years they have started to appear in December and January, but this case is exceptional on all counts. This stratospheric warming, apparently, is the strongest ever observed in the first half of January, according to the figure NOAA. No one knows why the number of large warming increases, but there is a positive correlation between the anomalies of sea surface temperature and the active phase of the solar cycle. This year, the sun is active, and there is ample surface temperature anomalies in the positive in the north Indian Ocean and the Northwest Pacific.
Animation temperature anomalies at the surface pressure of 30mb
stratosphere indicate the value of this huge event.
Key stratospheric warming and how they have a great influence on the weather.
Warm air in the stratosphere radiates warmth and down, and then, warming shrinks heating. This leads to a "dome" of relatively warm air and high pressure, which is formed around the pole. The cold air is pushed from the pole, in this case, is two vortices. In the Pacific, the dynamic interaction of cold air from the unusually warm water in the north-eastern coast of Japan led to the formation of one of the most powerful storms in many years in the North Pacific Ocean. The pressure in the central area was 932mb, the same as that of a strong hurricane, and occurred modeling waves higher than 60 feet (about 18 meters).