No. Tornado activity fluctuates from year to year. If you look at tornado activity from recent years you get the following general values:
2008: above normal
2009: below normal
2010: near normal
2011: well above normal
2012: below normal
2013: below normal
As for 2014, January and February are two of the least active months for tornadoes, made even more so by the unusually cold winter. This will not necessarily correlate to low activity in the tornado season.
Tornado activity so far in the 21st century is lower overall than it was in the 1950s and 1960s, but higher than it was in the 1980s.
Currently scientists are uncertain as to how global warming would affect tornadoes. This is further complicated by a lack of complete, long-term tornado records. So far no substantial link has been discovered.
It is not known for certain, but it is believed that tornadoes dissipate when cold outflow from a storm undercuts the updraft that powers a tornado and cuts off the supply of warm air that fuels it.
They aren't. Apart from the extremely deadly 2011 tornado season, annual tornado death tolls in the U.S. have actually been decreasing due to improved warning systems. However, some warn that tornado fatalities could rise as populated areas grow, giving tornadoes more targets in which deaths may occur.
Decreasing motion, Decreasing, Decreasing speed, Stopping
Tornadoes in the U.S. are called tornadoes.
Decreasing
Decreasing
Decreasing.
Decreasing
It is decreasing
waxing is growing and waning is decreasing
Tornadoes are sometimes divided into "weak" tornadoes "strong" and "violent" tornadoes. Weak tornadoes are those rated EF0 and EF1. Most tornadoes are weak. Strong tornadoes are those rated EF2 and EF3. Violent tornadoes are those rated EF4 and EF5. They are the rarest of tornadoes, only about 1% of tornadoes are this strong.