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.
No terrain is safe from tornadoes. Never open windows in severe weather situations. This allows damaging wind and debris to enter the structure. 69% of all tornadoes are labeled weak tornadoes meaning they have a lifetime of 1-10+ minutes and winds less than 110 mph. 29% of all tornadoes are labeled strong tornadoes meaning they last 20 minutes or longer and winds reach 110-205 mph.