The extreme freeze has blanketed the Northeast part of United States, some local news report said the casualties as of writing has reached to 21 people.
The abnormal weather was brought by the phenomenon called “Polar Vortex”, some of our readers may asked what is this?
According to National Weather Service, the polar vortex is a large area of low pressure and cold air surrounding both of the Earth’s poles.
It ALWAYS exists near the poles, but weakens in summer and strengthens in winter. The term “vortex” refers to the counter-clockwise flow of air that helps keep the colder air near the Poles.
Furthermore, many times during winter in the northern hemisphere, the polar vortex will expand, sending cold air southward with the jet stream (see graphic above). This occurs fairly regularly during wintertime and is often associated with large outbreaks of Arctic air in the United States.
The one that occurred January 2014 is similar to many other cold outbreaks that have occurred in the past, including several notable colder outbreaks in 1977, 1982, 1985 and 1989.
ALL YOU NEED TO KNOW ABOUT POLAR VORTEX
There are several things the polar vortex is NOT. Polar vortexes are not something new.
The term “polar vortex” has only recently been popularized, bringing attention to a weather feature that has always been present. It is also not a feature that exists at the Earth’s surface.
Weather forecasters examine the polar vortex by looking at conditions tens of thousands of feet up in the atmosphere; however, when we feel extremely cold air from the Arctic regions at Earth’s surface, it is sometimes associated with the polar vortex. This is not confined to the United States.
Portions of Europe and Asia also experience cold surges connected to the polar vortex. By itself, the only danger to humans is the magnitude of how cold temperatures will get when the polar vortex expands, sending Arctic air southward into areas that are not typically that cold.
In short, there is no cause to be alarmed when you hear about the polar vortex, but you should be prepared for colder temperatures.
The agency has advised all the people to be vigilant and prepared, they remind everyone to check the forecast for your area in order to ensure you are dressed appropriately.
Stay warm everyone!!