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‘Why so many Tornadoes this year?’ — by Roy W. Spencer, Ph.D.

Roy W. Spencer (Ph.D. Meteorology) is a weather and climate researcher at the University of Alabama in Huntsville. During his college years, he performed tornado damage surveys for the National Weather Service, and has published studies on the use of satellite data to identify severe thunderstorms.

Below is Spencer’s article, first featured on FoxNews.com:

‘Why so many Tornadoes this year? It’s not what AOC, Bernie Sanders (or maybe even you) think’

Progressive politicians like Al Gore, Sen. Bernie Sanders, I-Vt., and Rep. Alexandria Ocasio-Cortez, D.N.Y., don’t hesitate to blame any kind of severe weather – even if it is decreasing over time – on global warming.

With the devastating Dayton, Ohio tornadoes fresh on our minds, it is useful to examine exactly why (modest) global warming has produced fewer – not more – of such events.

The simple answer is that tornado formation requires unusually cool air.

Very few thunderstorms produce tornadoes. In the hot and humid tropics, they are virtually unheard of. The reason why is that (unlike hurricanes) tornadoes require strong wind shear, which means wind speed increasing and changing direction with height in the lower atmosphere.

These conditions exist only when a cool air mass collides with a warm air mass. And the perfect conditions for this have existed this year as winter has refused to lose its grip on the western United States. So far for the month of May 2019, the average temperature across the U.S. is close to 2 degrees Fahrenheit below normal.

Every year, springtime thunderstorms in Central and Southeast U.S. have plenty of warm, moist air to draw on from the Gulf of Mexico. What they generally don’t have is a persistent cold air mass producing strong wind shear at the boundary between a warm and cold air mass.

In recent decades, slow warming in the U.S. has been accompanied by fewer of these cold springtime air masses over the West.  As a result, based upon official National Weather Service statistics the long-term trend of strong (EF3) to violent (EF5) tornadoes has been decidedly downward, with 2018 experiencing a record low in activity.

But this year, snows have extended into late May from Northern Michigan through Colorado to the Sierra of California.  As a result of this persistent cold air mass, as of May 27, we are well above normal for total U.S. tornadoes.

This is what weather does – it varies from year to year. The alarmist claims of AOC, Gore, and Sanders are not just speculative; they are opposed by our observations and by meteorological theory.

By Dr. ROY W. SPENCER

www.drroyspencer.com

Grand Solar Minimum + Pole Shift

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2 Thoughts to “‘Why so many Tornadoes this year?’ — by Roy W. Spencer, Ph.D.”

  1. AMMANN CARLO

    Super great post. Climate really needs a close up observation of the facts.

  2. prioris

    Roy Spence mentions Bernie Sanders but neglects to mention the other 99 people in US Senate who maintain there is global warming whether man made or not. They don’t utter a peep about the grand solar minimum. Roy is wearing ideological blinders.

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