Tornado Swarms Are Now Upon Us
Despite greenhouse gases storing more heat energy for storms, there hasn’t been a mad increase in tornadoes in the United States. However, the behavior of tornadoes is changing, moving from being spread throughout the year to coming in “clusters” of frenzied and destructive tornadic activity.
That’s the conclusion of Harold Brooks and other NOAA researchers who have done a fresh scan of the nation’s historical weather data. Since the 1950s, they write in a study in Science, there hasn’t been any significant trend in the number of tornadoes each year. But beginning in the ’70s, more and more twisters have come down in violent swarms—think of the horrible outbreak of April 2011, when in just two-days’ time 175 confirmed tornadoes caused hundreds of deaths and billions in damages. (There were an astonishing 751 tornadoes that month, way above the historical annual mean of 495.)
Read the full text news resource site …
Source News: msn.com