Natural gas is mostly methane. In my piece on the Cornell study, my subhed was âLeakage of methane from fracking boosts shale gas global warming impact.â I didnât note until several paragraphs later that âNatural gas is composed largely of methane,â which comes from the second sentence of the study itself.
Tornado strength is currently measured on what is called the Enhanced Fujita Scale (adapted from the simpler Fujita Scale in 2007), which gives the tornado a rating from 0 to 5 based on estimated wind speeds and the severity of the damage.
The wind speeds in a tornado can be much higher than those in a hurricane but they affect only a small area and last only minutes. The life of the thunderstorm that generated the tornado is measured in two or three hours at most. In terms of damage done and lives lost, hurricanes are far more powerful than tornadoes.