Fetid was a child of the Latin word fetidus, and dates back to the early 15th century, as does its cousin (now in disuse), fetor. Reek, which originally was a verb meaning âto smoke,â took on the connotation of âto smell badâ in the 17th century.
A F4 tornado has a maximum speed of 260mph (418 kph). However it should be noted that the wind estimates of the original Fujita scale, which were meant to correlate with damage levels, have been found to be inaccurate. on the new Enhance Fujita scale the top estimated wind speed for an EF4 tornado is 200 mph.
There is no real set lower limit for the wind speed of a tornado.  The Fujita scale starts wind speed estimates for an EF0 tornado at  65 mph, but some tornadoes have had esâ¦timated winds as low as 55  mph. On the original Fujita scale, F0 wind estimates start at 40  mph.