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 caused by a tornado is its primary source of damage and destruction. Tornadoes are measured based on the Enhanced Fujita Scale. The weakest tornadoes, with wind speeds 65 to 85 mph, can rip branches off trees, uproot small trees and tear shingles off of houses. An EF 1 tornado has wind speeds ranging from 86 to 110 mph. These winds can tear up mobile homes and rooftops and cause exterior damage to houses. An EF 2 tornado's winds range from 111 to 135 mph. Winds of this consistency uproot mobile homes, tear roofs completely off houses and cause foundation damage to homes. A tornado with winds in the 136 to 165 range is classified as an EF3 tornado.