“Contrasting air masses of widely-varying temperatures is the key. Active tornado seasons in the U.S. are always the result of UNUSUALLY COLD air pushing much farther south than normal through the Midwest into Dixie.”
He goes on to add: “For example, the ‘poster child’ for active tornado seasons was the so-called ‘Super Outbreak’ in April of 1974, which took place during a period of widespread global cooling. (Some thought that we were entering a new ‘Little Ice Age.’)”
During this ‘La Nina’ spring, we’ve seen a much cooler and wetter than normal period that has significantly delayed the planting of corn east of the Mississippi River in the Midwest. There is no doubt that these La Nina years favor far more tornadoes than usual.
Disrupting the Borg is expensive and time consuming!
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Gore, where are you?
And you need lots of hot humid air to provide energy for the system. Cold air alone does not cut it. The Gulf is HOT. The air on average has more than 5% more water vapor in it. It’s that extra vapor that will a factor in all extreme weather events going forward.