Winter

Showing posts with the label Winter
Show all

Why Do U.S. Senators Serve Six-Year Terms?

Image
U.S. senators serve six-year terms because the Constitution's framers wanted a chamber with more continuity and independence than the House of Representatives. Six years was a compromise between competing ideas about stability and accountability. The length also fits a staggered election system: roughly one-third of Senate seats come before voters every two years. That means the country can change part of the chamber without replacing its entire elected membership at once. The choice was debated rather than discovered in a single obvious formula. The Senate's historical account describes proposals ranging from relatively short terms to life tenure. Some delegates wanted senators to have time to develop judgment and resist passing political pressures. Others worried that a long stay in office could distance members from the people and states they represented. A longer term could protect independent decisions, but it also postponed the next regular opportunity to replace a senato...

What Is the Polar Vortex and How Can It Affect Winter Weather?

Image
The polar vortex is a large area of cold air surrounded by strong winds that circles one of Earth’s polar regions. The term usually refers to the stratospheric polar vortex , which forms high above the Arctic during winter when the polar atmosphere becomes extremely cold. A separate, lower atmospheric circulation also influences weather closer to the surface. A strong polar vortex can help keep the coldest Arctic air concentrated near the pole. However, the vortex can become stretched, displaced, or weakened when large atmospheric waves disturb its circulation. One important event is sudden stratospheric warming , in which temperatures high in the stratosphere rise rapidly and the usual west-to-east winds can weaken or reverse. When the polar vortex is disturbed, parts of the cold air may move southward into lower latitudes. This can contribute to outbreaks of very cold weather in parts of North America, Europe, and Asia. It does not mean that every disruption will produce a major snow...