Wednesday, 11 February 2009
The Lone Grove tornado was classified as an EF-4 following a damage survey conducted by a team from the National Weather Service (NWS) office in Norman on Wednesday, February 11. This means that the tornado winds, based on the observed damage, are estimated to have been in the range of 166-200mph.
>>>"EF" refers to the "Enhanced Fujita" scale. It is named after Ted Fujita, a pioneer in tornado research. His original "F" scale was revamped to better account for the damage sustained at different winds speeds by various types of structures.
>>>It is intended to give a more accurate estimate of winds. Tornado size and wind speeds are related, as large tornadoes tend to have a more intense circulation. However, one cannot say that a tornado is an EF-4 or EF-5 simply because it is large. There are numerous cases of a tornado a 1/2 mile wide being only an EF-1 or EF-2.
>>>That's why the damage survey is such an important element in determining actual tornado intensity. The Lone Grove tornado falls in the "severe" tornado category as an EF-4.
>>>The February 10th tornado which devastated parts of Lone Grove is the worst to hit Texoma since 1982 in terms of lives lost.
>>>It is also the first major tornado to strike Carter County since the May 7, 1995 event.
That one heavily damaged the Michelin (then Uniroyal) tire plant.
Please check back on this blog as I'll be posting additional information about the Lone Grove tornado as it becomes available in the next few days.