A tornado is caused by extremely cold air sliding above ambient, moist air. The lower ambient air, being warmer and lighter, rises through the colder air. As the ambient, moist air rises, the pressure drops, causing the water vapor in the ambient air to condense.
Now the heat of vaporization of water is 2,260 joules per gram, which means that it take 2,260 watt-seconds or 1,667 foot pounds of energy to convert one gram (0.035 ounce) of water to water vapor. Since the Law of Conservation of Energy has not yet been repealed by the Democrats, every gram (0.035 ounce) of water that condenses releases the energy it took to vaporize it – which is the heat generated by a 100 watt bulb burning for 22 seconds. That's a lot of heat from a tiny bit of water – enough to raise the temperature of a cubic foot of air 5 degrees, or 9 degrees Fahrenheit..
The heat of condensation causes the (now even warmer) air to rise even faster through the cold upper air. As the warm air rises, it starts to spin just as the water running down the drain in your sink spins. And as it goes higher, the pressure drops lower, and more water vapor condenses, warming the air more and causing it to rise even faster. If the upper air is cold enough, the heated ambient air can rise so fast that it creates a vacuum at the base of the rising column, and it sucks surface ambient air into its spinning, rising column like a giant vacuum cleaner. And that is a tornado.
Note that it is cold air, not warm air, that causes a tornado. And note that the colder the air, the faster the ambient air rises and the more severe the tornado.
Thus we see tonradic activity increasing during periods of solar cooling. 1973, during the last solar cooling cycle, had almost 900 tornadoes – a record that was broken in 2011. The next highest number of total tornadoes in a year was 720 in 1974, followed by 710 in 2008 and 700 in 1970. 1973 also saw the highest number of violent(F3 or above) tornadoes, 130, a record that still stands.
Conversely, the solar warming period of the 1990s saw a paucity of violent storms – from 15 in 1987 (the lowest in recorded history) to a peak of 64 in 1999.
Thus we are seeing a current increase in tornadoes consistent with a pattern of "global" cooling. The tornadoes that went through Arkansas this week had to have been caused by an extremely cold air mass – an unusually frigid air mass for this late in the year. This is a phenomenon hardly consistent with the myth of "global warming."