Difference between revisions of "Fujita scale"
From Glossary of Meteorology
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== Fujita scale == | == Fujita scale == | ||
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| − | <div class="definition"><div class="short_definition">(Also known as the F-scale.) Relates [[tornado]] intensity indirectly to structural and/or vegetative damage.</div><br/> <div class="paragraph">The estimated [[wind speed]] is calculated using the following formula: V = 6.30 (F+2)<sup>1.5</sup> m s<sup> | + | <div class="definition"><div class="short_definition">(Also known as the F-scale.) Relates [[tornado]] intensity indirectly to structural and/or vegetative damage.</div><br/> <div class="paragraph">The estimated [[wind speed]] is calculated using the following formula: ''V'' = 6.30 (''F'' + 2)<sup>1.5</sup> m s<sup>−1</sup>. A six-point scale has been developed that corresponds to the following wind speed estimates: |
| − | :<div class="list_item">F0 (light damage): 18–32 m s<sup> | + | :<div class="list_item">F0 (light damage): 18–32 m s<sup>−1</sup></div> |
| − | :<div class="list_item">F1 (moderate damage): 33–49 m s<sup> | + | :<div class="list_item">F1 (moderate damage): 33–49 m s<sup>−1</sup></div> |
| − | :<div class="list_item">F2 (considerable damage): 50–69 m s<sup> | + | :<div class="list_item">F2 (considerable damage): 50–69 m s<sup>−1</sup></div> |
| − | :<div class="list_item">F3 (severe damage): 70–92 m s<sup> | + | :<div class="list_item">F3 (severe damage): 70–92 m s<sup>−1</sup></div> |
| − | :<div class="list_item">F4 (devastating damage): 93–116 m s<sup> | + | :<div class="list_item">F4 (devastating damage): 93–116 m s<sup>−1</sup></div> |
| − | :<div class="list_item">F5 (incredible damage):117–142 m s<sup> | + | :<div class="list_item">F5 (incredible damage):117–142 m s<sup>−1</sup>.</div><br/> Although extremely dependent on the design of a structure and the tree type, the following visual characteristics of the damage have been assigned to the F-scale. |
:<div class="list_item">F0 - Some damage to chimneys; branches broken; shallow-rooted trees knocked over.</div> | :<div class="list_item">F0 - Some damage to chimneys; branches broken; shallow-rooted trees knocked over.</div> | ||
:<div class="list_item">F1 - Surface of roofs peeled off; mobile homes pushed off foundations or overturned; moving autos pushed off road.</div> | :<div class="list_item">F1 - Surface of roofs peeled off; mobile homes pushed off foundations or overturned; moving autos pushed off road.</div> | ||
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:<div class="list_item">F3 - Roofs and some walls torn off well-constructed houses; trains overturned; most trees in forest uprooted; heavy cars lifted off ground and thrown.</div> | :<div class="list_item">F3 - Roofs and some walls torn off well-constructed houses; trains overturned; most trees in forest uprooted; heavy cars lifted off ground and thrown.</div> | ||
:<div class="list_item">F4 - Well-constructed houses leveled; structures with weak foundations blown off; large missiles generated.</div> | :<div class="list_item">F4 - Well-constructed houses leveled; structures with weak foundations blown off; large missiles generated.</div> | ||
| − | :<div class="list_item">F5 - Strong frame houses lifted off foundations and carried considerable distances; automobile- sized missiles flying through the air for distances in excess of 100 m; trees debarked.</div><br/></div><br/> </div><div class="reference">Fujita, T. 1981. Tornadoes and downbursts in the context of generalized planetary scales. J. Atmos. Sci. | + | :<div class="list_item">F5 - Strong frame houses lifted off foundations and carried considerable distances; automobile- sized missiles flying through the air for distances in excess of 100 m; trees debarked.</div><br/></div><br/> </div><div class="reference">Fujita, T. 1981. Tornadoes and downbursts in the context of generalized planetary scales. ''J. Atmos. Sci.'', '''38'''. 1511–1534. </div><br/> |
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| + | ''Term edited 1 March 2021'' | ||
{{TermIndex}} | {{TermIndex}} | ||
Latest revision as of 05:30, 1 March 2021
Fujita scale
(Also known as the F-scale.) Relates tornado intensity indirectly to structural and/or vegetative damage.
The estimated wind speed is calculated using the following formula: V = 6.30 (F + 2)1.5 m s−1. A six-point scale has been developed that corresponds to the following wind speed estimates:
- F0 (light damage): 18–32 m s−1
- F1 (moderate damage): 33–49 m s−1
- F2 (considerable damage): 50–69 m s−1
- F3 (severe damage): 70–92 m s−1
- F4 (devastating damage): 93–116 m s−1
- F5 (incredible damage):117–142 m s−1.
Although extremely dependent on the design of a structure and the tree type, the following visual characteristics of the damage have been assigned to the F-scale. - F0 - Some damage to chimneys; branches broken; shallow-rooted trees knocked over.
- F1 - Surface of roofs peeled off; mobile homes pushed off foundations or overturned; moving autos pushed off road.
- F2 - Roofs torn off frame houses; mobile homes demolished; boxcars pushed over; large trees snapped or uprooted.
- F3 - Roofs and some walls torn off well-constructed houses; trains overturned; most trees in forest uprooted; heavy cars lifted off ground and thrown.
- F4 - Well-constructed houses leveled; structures with weak foundations blown off; large missiles generated.
- F5 - Strong frame houses lifted off foundations and carried considerable distances; automobile- sized missiles flying through the air for distances in excess of 100 m; trees debarked.
Fujita, T. 1981. Tornadoes and downbursts in the context of generalized planetary scales. J. Atmos. Sci., 38. 1511–1534.
Term edited 1 March 2021
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