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.
A tornado is a violent rotating column of air that is contact with both the ground as well as a cumulonimbus cloud. It is also known as twisters or cyclones. The base of a tornado that touches the earth is usually surrounded by a cloud of dust and debris. A tornado depending on its size can have wind speeds between 40mph and 360mph. Tornadoes often develop from a class of thunderstorms known as supercells.