This is the Fujita Scale which has been enhanced version indicator, as a measure of strength of tornadoes based on wind speed indicator tornado as it passed.
On Tuesday May 21, 2013 that the officials from the National Weather Service (NWS) said that the United States they increase the power status of the tornado that swept Oklahoma widened Scale EF4 EF5 scale.Associated with the announcement that become our question is what the terms mean and scale EF4 and EF5 or other damage level scale.
Scale measuring tornado strength according to the Fujita scale scale turns EF5 is the highest scale. According to the description of the Fujita scale of tornado power of the incoming class is scale EF5 tornado speeds exceeding 200 miles per hour or more than 320 kilometers per hour. Extent of the damage on a scale EF5 every case is different apparently influenced by many factors, one of which is the strength of the building and the presence or absence of a barrier that prevents a trip or a long time tornadoes and tornado occurrence. As in the news that the rise in status of EF4 to EF5 scale ternyada level of damage was not as severe as in 1999 in the same place. In 1999 at the Moore tornado swept at 500 kilometers per hour. Scale EF5 tornado in Oklahoma is the 59th time since 1950.
Fujita scale as a determinant of tornado strength scale
problems often experienced in measuring tornado strength measuring equipment is destroyed because badai.Para buffeted by weather experts rely on a variant of what is known as the Fujita scale since 1971. This scale is a breakthrough that led Theodore Fujita of the University of Chicago.
In the Fujita scale there are 5 categories of hurricane strength starts from EF0 to EF5. Fujita Scale measure was first published in the scientific journal Gale. For nearly three decades the use Fujita scale is considered to be an effective measure to determine the strength of the storm that destroyed buildings and plants. However, large storms, especially in Jarrel, Texas, in 1997 and in Moore, Oklahoma, in 1999, showed that size was no longer adequate.
Fujita scale increase
since 2007 in the Fujita scale indicator plus a more detailed velocity measurements by including 28 indicators of damage, by stating the lower and upper limits that can lead to damage.
Fujita scale led to an increase in the numbers as follows, respectively from a low level to highest:
- EF0 tornado 105-137 kilometer per hour speed
- EF1 tornado 138-177 kilometer per hour speed
- EF2 tornado 178-217 kilometer per hour speed
- EF3 tornado 218-266 kilometer per hour speed
- EF4 tornado 267-322 kilometer per hour speed
- EF5, tornadoes speed of more than 322 kilometers per hour
The less accurate is the determination of the scale are subjective because the equipment used is generally participate storm. as long as the researchers are still unable to connect to the influence of the lower limit and upper limit of the speed of the damage indicator.
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