168:
645:
846:
possible to low lying shrubs/bushes, particularly of the evergreen variety. Moderate damage to trees, with a few medium sized branches in leaf snapping on the upper bound of T1, trees without leaves on them likely remaining mostly unscathed except for significant twig breakage, although for some a few small branches could break. Very weak/unhealthy trees, particularly those in leaf and of softwood variety such as conifers are likely to be nearly or completely uprooted.
1009:
warehouse-type constructions may buckle slightly. Well built steel reinforced concrete buildings/houses suffer total roof loss with some damage to overall structure though most walls remain standing, particularly the lower floors. Trains whether stationary or not are blown over. All large branches torn/stripped from trees down to the trunk, some small-medium sized trees are thrown. Noticeable debarking of any standing tree trunks from flying debris.
692:
change of type of railway locomotives, and was written in an environment where tornadoes of F2 or stronger are extremely rare, so little or no first-hand investigation of actual damage at the upper end of the scale was possible. The TORRO scale has more graduations than the F scale which makes it arguably more useful for tornadoes on the lower end of the scale; however, such accuracy and precision are not typically attainable in practice.
66:
871:
plastic/glass roofing cover with a total collapse of some weak/average greenhouse structures likely. Garage roofs torn away, some to significant damage to tiled roofs and chimney stacks with many tiles missing, particularly to weak wooden framed homes, though typically thatched roofs with small eaves/smooth surface suffer only minor damage, outbuildings lose entire roofs and suffer some degree of damage to actual structure.
25:
1059:
likely to be flipped and rolled repeatedly some distance away from tracks with some levitation likely along the way. Strong brick masonry buildings/houses almost or completely destroyed with large sections of houses/building blown away from foundation. Concrete pathways slightly above soil level could be shifted in position by several inches. Complete debarking of any standing tree-trunks.
960:
likely inside of these buildings. Stronger brick masonry homes may lose a few rows of bricks on second floor, though overall structure below roof itself largely standing with bottom floor relatively intact except for doors and windows, the roof mostly or entirely blown/torn off. The oldest, weakest buildings may collapse completely.
983:
buildings collapse, national grid pylons severely damaged or blown down/bent and deformed, Strong trees that aren't uprooted /snapped will suffer major debranching with most leaves torn off, other trees excluding the widest and strongest ones are snapped/uprooted, very large heavy branches thrown large distances.
687:
replaced the original Fujita Scale from 1971. It made substantial improvements in standardizing damage descriptors through expanding and refining damage indicators and associated degrees of damage, as well as calibrated tornado wind speeds to better match the associated damage. However, the EF Scale,
1112:
In terms of man made objects, only the very heaviest ones for example locomotives/trains weighing hundreds of tons and the strongest of buildings made low to the ground with specific very aerodynamic designs and incredibly thick load bearing steel concrete walls with no windows/discernible roof will
820:
Loose light litter such as paper, leaves and twigs raised from ground level in spirals. Secured tents and marquees seriously disturbed; a few exposed tiles/slates on roofs dislodged. Twigs and perhaps weak small branches that are in leaf snapped from some trees; minimal or no damage to trees with no
870:
Heavy mobile homes displaced with some damage to exterior, light caravans lose majority of roof and/or are blown over, particularly from upper bound winds of T2, bonnets blown open on some vehicles, average strength sturdy garden sheds destroyed, greenhouses of weak/average construction lose entire
691:
Unlike with the F scale, no analyses have been undertaken at all to establish the veracity and accuracy of the T scale damage descriptors. The scale was written in the early 1970s, and does not take into account changes such as the growth in weight of vehicles or the great reduction in numbers and
700:
stated that "the problems associated with damage surveys and uncertainties associated with estimating wind speed from observed damage make highly precise assignments dubious". In survey reports, Fujita ratings sometimes also have extra qualifications added ("minimal F2" or "upper-end F3 damage"),
1058:
Many steel-framed/concrete buildings badly damaged though some of structure may remain standing albeit shifted in position on foundation; skyscrapers toppled; locomotives or trains likely blown over and rolled a short distance from tracks with damage to its exterior, empty train cars however are
1033:
Cars and other larger/heavier vehicles such as trucks hurled great distances. Strong wooden-framed houses and their contents dispersed over long distances; strong stone or brick masonry buildings severely damaged or largely destroyed with one or two sections of walls blown away; steel reinforced
901:
Mobile homes overturned / badly damaged; light caravans severely damaged or destroyed; garages and weak outbuildings severely damaged or destroyed; house roof timbers considerably exposed with more strongly built brick masonry houses suffering major roof damage with chimneys at risk of collapse,
959:
Strong framed wooden buildings/weak brick masonry buildings receive more significant damage than T4 though walls on ground floor will probably remain, some wall damage on second/upper floor connected to roof is likely though with one or two walls blowing down/collapsing, some/significant damage
679:
in that it is "purely" a wind speed scale, whereas the Fujita scale relies on damage for classification, but in practice, damage is utilised almost exclusively in both systems to infer intensity. That is because such a proxy for intensity is usually all that is available, although users of both
926:
Cars levitated. Mobile homes/lighter caravans airborne / destroyed; garden sheds obliterated and airborne for considerable distances; entire roofs removed from some houses; roof timbers of stronger brick or stone houses completely exposed; gable ends torn away. "Weak" framed wooden houses will
845:
Deckchairs, small plants/plants in small pots, heavy litter becomes airborne; minor damage to sheds. More serious/numerous dislodging of tiles, slates and chimney pots with some tiles/slates blown off typical/average strength roofs. Low quality wooden fences damaged or flattened. Slight damage
1008:
Strongly built wooden-framed/weak brick masonry buildings/houses wholly demolished; some walls of more strongly built stone / brick masonry houses beaten down or collapse with significant damage to overall structure, with some shifting on foundations likely; skyscrapers twisted; steel-framed
982:
Strong framed wooden buildings largely or completely destroyed, Strongly built brick masonry houses lose entire roofs just like T5 though exterior walls on second floor now likely blown down or collapsed with significant interior damage, windows broken on skyscrapers, more of the less-strong
1108:
Exceptionally well built very thick walled (40-80cm) brick masonry buildings are completely destroyed and swept off foundations entirely with only flooring or foundations remaining with even these potentially damaged or with sections pulled off entirely; Well built steel-reinforced concrete
688:
having been designed based on construction practices in the United States, is not necessarily applicable across all regions. The EF-scale and variants thereof are officially used by the United States, Canada, France, and Japan, as well as unofficially in other countries, such as China.
1113:"survive" a tornado of this strength, survival would be reliant on these specialised structures or out of path of the tornado itself. But the precise design needed and possibility of it actually successfully providing adequate safety during such a tornado is very speculative for now.
902:
though structure/walls of the building below roof itself mostly intact except for windows breaking especially from any small flying objects. Most large healthy trees lose many big branches and many are snapped or uprooted, lighter cars flipped.
704:
Tornadoes are rated after they have passed and have been examined, not whilst in progress. In rating the intensity of a tornado, both direct measurements and inferences from empirical observations of the effects of a tornado are used. Few
680:
scales would prefer direct, objective, quantitative measurements. The scale is primarily used in the United
Kingdom whereas the Fujita scale has been the primary scale used in North America, continental Europe, and the rest of the world.
1083:
Entire very well built houses/buildings lifted bodily or completely from foundations and carried a large distance to disintegrate. Steel-reinforced concrete buildings severely damaged or almost obliterated. (e.g. 1930 Montello tornado)
733:
estimates wind speed by measuring tracers in the vortex. In most cases, aerial and ground damage surveys of structures and vegetation are utilised, sometimes with engineering analysis. Also sometimes available are ground swirl patterns
1034:
concrete homes/large buildings suffer significant to major structural damage. Skyscrapers badly twisted and may show a visible lean to one side; shallowly anchored high rises may be toppled; other steel-framed buildings buckled.
951:
Heavy vehicles such as buses/lorries (trucks) overturned or overturned and displaced some distance in excess of 10 metres though with minimal levitation, lighter vehicles such as passenger cars thrown large distances.
738:
marks) left in the wake of a tornado. If an on site analysis is not possible, either for retrospective ratings or when personnel cannot reach a site, photographs, videos, or descriptions of damage may be utilised.
955:
Wind turbines built from strong material suffer significant blade damage with blades ending up shredded or broken/ possibly suffering permanent deformation of tower/blades with winds on the upper bounds of T5.
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are listed below, in order of increasing intensity. Although the wind speeds and photographic damage examples are updated, which are more or less still accurate. However, for the actual
683:
At the 2004 European
Conference on Severe Storms, Dr. Meaden proposed a unification of the TORRO and Fujita scales as the Tornado Force or TF Scale. In 2007 in the United States, the
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receive some damage to structure though most of structure still standing. Numerous strong trees uprooted or snapped with all trees within damage path receiving some debranching.
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1537:
Meaden, G. T. (1985). "A study of tornadoes in
Britain, with assessments of the general tornado risk potential and the specific risk potential at particular regional sites".
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Significant damage to most tree types, some big branches twisted or snapped off, most small and shallow rooted trees whether in leaf or not are uprooted or snapped.
986:
Lighter vehicles thrown upto a mile in some cases, heavy vehicles such as buses lofted and tossed tens of metres away, trains derailed/blown over while in motion.
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in 1975. The scale sets T0 as the equivalent of 8 on the
Beaufort scale and is related to the Beaufort scale (B), up to 12 on the Beaufort scale, by the formula:
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made by investigators who have experience of many similar tornadoes and relating to the fact that the F scale is a damage scale, not a wind speed scale.
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in practice, damage indicators (the type of structure which has been damaged) are predominantly used in determining the tornado intensity.
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Guttering pulled from some houses with some siding damage possible, older single glazed windows blown in or out of frames or smashed.
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structures/homes are completely destroyed. Tall buildings collapse. Cars, trucks and train cars thrown in excess of 1-3 miles.
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Chen, Jiayi; Cai, Xuhui; Wang, Hongyu; Kang, Ling; Zhang, Hongshen; Song, Yu; Zhu, Hao; Zheng, Wei; Li, Fengju (April 2018).
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was first introduced in 1805, and in 1921 quantified. It expresses the wind speed as faster than v in the formula:
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Meaden, G. T. (1976). "Tornadoes in
Britain: Their intensities and distribution in space and time".
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Most UK tornadoes are T6 or below with the strongest known UK tornado estimated as a T8 (the
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Please help update this article to reflect recent events or newly available information.
1500:
1234:
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442:). For comparison, the strongest detected winds in a United States tornado (during the
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1465:"Some aspects of the international climatology of tornadoes by damage classification"
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The scale was tested from 1972 to 1975 and was made public at a meeting of the
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is TORRO intensity number. Wind speed is defined as a 3-second gust at 10
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1393:"The Japanese Enhanced Fujita Scale: Its Development and Implementation"
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are struck by a tornado, and even fewer survive, so there are very few
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intensity between T0 and T11. It was proposed by
Terence Meaden of the
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Significant
Tornadoes 1680-1991, A Chronology and Analysis of Events
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1311:"Assessment of Tornados with the Enhanced Fujita Scale in Romania"
1507:. St. Johnsbury, VT: The Tornado Project of Environmental Films.
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measurements. Therefore, almost all ratings are obtained from
1378:"Intensité des tornades : l'échelle de Fujita améliorée"
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Nucuta, C.; Timis, C.; Butiu, C.; Scridonesi, O. (2011).
1219:. Tornado and Storm Research Organisation. Archived from
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Wind speed scales: Beaufort, T Scale, and Fujita's Scale
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Alternatively, the T-Scale formula may be expressed as:
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90:. Unsourced material may be challenged and removed.
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1577:Determination of tornado or downburst intensity
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256:Tornado and Storm Research Organisation (TORRO)
635:Rating process and comparisons to Fujita scale
446:) would be T11 using the following formulas:
1315:Babes Bolyai University Faculty of Geography
53:Learn how and when to remove these messages
274:History and derivation from Beaufort scale
1358:Measuring tornadoes: F-scale vs. EF-scale
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230:Learn how and when to remove this message
212:Learn how and when to remove this message
150:Learn how and when to remove this message
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175:This article includes a list of general
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1239:"The Fujita Scale of Tornado Intensity"
1215:Meaden, Terence; TORRO members (2004).
1197:List of tornadoes and tornado outbreaks
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725:is used when available, and sometimes
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1241:. The Tornado Project. Archived from
821:leaves, trail visible through crops.
1565:T-Scale Origins and Scientific Basis
1419:International Journal of Climatology
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88:adding citations to reliable sources
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1265:"The Enhanced Fujita Tornado Scale"
624:{\displaystyle T=(v/2.365)^{2/3}-4}
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1391:Suzuki, Shota; Tanaka, Yoshinobu.
1337:"Enhanced Fujita Scale (EF-Scale)"
181:it lacks sufficient corresponding
16:Scale for rating tornado intensity
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1463:; Charles A. Doswell III (2001).
1339:. Environment Canada. 10 May 2013
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675:TORRO claims it differs from the
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1267:. National Climatic Data Center
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1006:Strongly - devastating damage.
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747:The 12 categories for the
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1469:Atmospheric Research
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262:organisation in the
84:improve this article
1501:Grazulis, Thomas P.
1481:2001AtmRe..56..191B
1431:2018IJCli..38.2478C
1106:Phenomenal damage.
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843:Mild damage.
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101: –
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99:"TORRO scale"
96:
95:Find sources:
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73:This article
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1341:. Retrieved
1331:
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1269:. Retrieved
1258:
1247:. Retrieved
1243:the original
1229:
1221:the original
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677:Fujita scale
674:
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559:
558:= 0.837(2) (
550:
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82:Please help
77:verification
74:
50:
43:
37:
36:Please help
33:
1317:: 568–575.
771:(Estimated)
753:TORRO scale
749:TORRO scale
707:anemometers
364:TORRO scale
194:introducing
1587:Categories
1376:KERAUNOS.
1323:1318799643
1271:2011-12-31
1249:2011-12-31
1203:References
1078:121 - 134
1053:108 - 120
767:Wind speed
540:= 0.837 (2
517:wind speed
177:references
110:newspapers
39:improve it
1579:(TorDACH)
1447:0899-8418
1075:433 - 482
1072:270 - 299
1050:386 - 432
1047:241 - 269
1028:96 - 107
1025:343 - 385
1022:213 - 240
1000:300 - 342
997:187 - 212
974:260 - 299
971:161 - 186
943:221 - 259
940:137 - 160
918:185 - 220
915:115 - 136
893:148 - 184
862:116 - 147
736:cycloidal
616:−
500:= 4.596 (
485:= 5.289 (
470:= 8.511 (
455:= 2.365 (
45:talk page
1503:(1993).
1361:Archived
1343:19 April
1319:ProQuest
1237:(1999).
1176:See also
1169:Violent
1103:>135
1003:84 - 95
977:73 - 83
946:62 - 72
921:52 - 61
896:42 - 51
890:93 - 114
865:33 - 41
840:25 - 32
837:87 - 115
815:17 - 24
423:= 0.837
1603:Tornado
1573:(TORRO)
1567:(TORRO)
1561:(TORRO)
1477:Bibcode
1427:Bibcode
1166:Strong
1100:>483
1097:>300
859:73 - 92
834:55 - 72
812:61 - 86
809:39 - 54
719:proxies
711:in-situ
698:Doswell
654:updated
252:tornado
248:T-Scale
190:improve
124:scholar
1511:
1445:
1321:
694:Brooks
511:where
308:/2 - 4
179:, but
126:
119:
112:
105:
97:
1396:(PDF)
1290:(PDF)
1163:Weak
762:Scale
595:2.365
289:= 2 (
131:JSTOR
117:books
1598:Wind
1509:ISBN
1443:ISSN
1345:2014
1158:T11
793:km/h
696:and
562:+4)
544:+8)
519:and
504:+4)
489:+4)
476:km/h
474:+4)
459:+4)
412:The
293:+ 4)
258:, a
246:(or
242:The
103:news
1485:doi
1435:doi
1155:T10
1093:T11
1068:T10
798:m/s
788:mph
729:or
564:m/s
551:or
546:m/s
528:AGL
515:is
491:mph
461:m/s
428:m/s
406:11
403:10
358:12
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86:by
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1131:T2
1128:T1
1125:T0
1043:T9
1018:T8
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967:T6
936:T5
911:T4
886:T3
855:T2
830:T1
805:T0
568:or
530:.
506:kn
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304:=
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662:(
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587:v
584:(
581:=
578:T
560:T
556:v
542:T
538:v
525:m
521:T
513:v
502:T
497:v
487:T
482:v
472:T
467:v
457:T
452:v
425:B
421:v
369:T
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306:B
302:T
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287:B
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128:·
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51:(
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