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 weather service defines a âsevere stormâ as a thunderstorm with âwind gusts to at least 58 mph, and/or hail at least one inch in diameter and/or a tornado.â. There are now six classifications for severe weather: Thunderstorms (no label) : No severe thunderstorms expected, winds to 40 mph, small hail. Marginal Risk: Isolated severe storms are possible, limited in duration or intensity. Winds up to 60 mph, hail up to one inch, low tornado risk. Slight Risk: Scattered severe storms possible, short-lived, some isolated intense storms possible. One or two tornadoes, wind damage potential, hail.