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.
Predicting storm damage. Forecasters use the data to categorize hurricanes on the Saffir-Simpson Hurricane Wind Scale, a 1 to 5 rating of sustained wind speed. The scale estimates potential property damage, from 1 (Very dangerous winds will produce some damage) to 5 (Catastrophic damage will occur).