1981 United Kingdom tornado outbreak
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The 1981 United Kingdom tornado outbreak is regarded as the largest recorded
tornado outbreak __NOTOC__ A tornado outbreak is the occurrence of multiple tornadoes spawned by the same synoptic scale weather system. The number of tornadoes required to qualify as an outbreak typically are at least six to ten, with at least two rotational l ...
in European history. In the span of 5 hours and 26 minutes during the late morning and early afternoon of 23 November 1981, 104 confirmed tornadoes touched down across Wales and central, northern and eastern England. Although the majority of tornadoes were very weak, measuring FU-F1 on the
Fujita scale The Fujita scale (F-Scale; ), or Fujita–Pearson scale (FPP scale), is a scale for rating tornado intensity, based primarily on the damage tornadoes inflict on human-built structures and vegetation. The official Fujita scale category is determ ...
, widespread property damage was reported, mainly from the small number of tornadoes which intensified to F2 strength. By the end of the outbreak, hundreds of properties across the country had been damaged. Most of the tornadoes occurred in rural areas and small villages across central parts of the United Kingdom, although several large metropolitan areas were affected. The
Liverpool Liverpool is a city and metropolitan borough in Merseyside, England. With a population of in 2019, it is the 10th largest English district by population and its metropolitan area is the fifth largest in the United Kingdom, with a popul ...
area was the first to be struck by multiple tornadoes around 11:30, followed by the
Manchester Manchester () is a city in Greater Manchester, England. It had a population of 552,000 in 2021. It is bordered by the Cheshire Plain to the south, the Pennines to the north and east, and the neighbouring city of Salford to the west. The t ...
area around 12:00, the Hull area around 13:30 and the
Birmingham Birmingham ( ) is a city and metropolitan borough in the metropolitan county of West Midlands in England. It is the second-largest city in the United Kingdom with a population of 1.145 million in the city proper, 2.92 million in the West ...
area around 14:00. The strongest tornado of the outbreak, an F2 tornado, struck
Holyhead Holyhead (,; cy, Caergybi , "Cybi's fort") is the largest town and a community in the county of Isle of Anglesey, Wales, with a population of 13,659 at the 2011 census. Holyhead is on Holy Island, bounded by the Irish Sea to the north, and is ...
in
Anglesey Anglesey (; cy, (Ynys) Môn ) is an island off the north-west coast of Wales. It forms a principal area known as the Isle of Anglesey, that includes Holy Island across the narrow Cymyran Strait and some islets and skerries. Anglesey island ...
,
Wales Wales ( cy, Cymru ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by England to the Wales–England border, east, the Irish Sea to the north and west, the Celtic Sea to the south west and the ...
at 10:30; the only other F2 tornado of the outbreak caused considerable damage in the village of Stoneleigh,
Warwickshire Warwickshire (; abbreviated Warks) is a county in the West Midlands region of England. The county town is Warwick, and the largest town is Nuneaton. The county is famous for being the birthplace of William Shakespeare at Stratford-upon-Avon an ...
around 14:00. With 104 tornadoes, this single-day outbreak alone saw more confirmed tornadoes than any other whole year in British history – 1974 previously held the record, with 80 tornadoes across the whole year. At the time of the 1981 outbreak, there had only been one other tornado outbreak in recorded history which produced more than 100 tornadoes within 24 hours, that being the 1974 Super Outbreak in the
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. However, that outbreak included many more powerful tornadoes and resulted in hundreds of fatalities.


Meteorological background

On 22 November 1981, a rapidly deepening low-pressure
extratropical cyclone Extratropical cyclones, sometimes called mid-latitude cyclones or wave cyclones, are low-pressure areas which, along with the anticyclones of high-pressure areas, drive the weather over much of the Earth. Extratropical cyclones are capable of ...
was centred just off the northern coast of Scotland. The central pressure of this system was 994 mbar at 12:00 GMT on 22 November, deepening to 968 mbar by 12:00 GMT on 23 November. At the same time, a high-pressure
anticyclone An anticyclone is a weather phenomenon defined as a large-scale circulation of winds around a central region of high atmospheric pressure, clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere as viewed from abov ...
was pushing into southern England from mainland Europe. There was an unusually strong upper-level temperature gradient between the low- and high-pressure systems, with the low-pressure system funnelling in cold, arctic air from the north, clashing with humid, subtropical air moving up from southern Europe in the anticyclone. During the morning of 23 November, a
cold front A cold front is the leading edge of a cooler mass of air at ground level that replaces a warmer mass of air and lies within a pronounced surface trough of low pressure. It often forms behind an extratropical cyclone (to the west in the Northern ...
attached to the southern edge of the low-pressure area began to cross the United Kingdom from west to east. Fuelled by this temperature gradient and warm subtropical air to the south, a number of
supercell A supercell is a thunderstorm characterized by the presence of a mesocyclone: a deep, persistently rotating updraft. Due to this, these storms are sometimes referred to as rotating thunderstorms. Of the four classifications of thunderstorms (s ...
thunderstorm A thunderstorm, also known as an electrical storm or a lightning storm, is a storm characterized by the presence of lightning and its acoustic effect on the Earth's atmosphere, known as thunder. Relatively weak thunderstorms are someti ...
s became embedded within the southern edge of the cold front and its pre-frontal rain bands, spawning the first tornadoes over Wales around 10:30
GMT Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London, counted from midnight. At different times in the past, it has been calculated in different ways, including being calculated from noon; as a cons ...
. By mid-afternoon, 104 tornadoes had been confirmed across the United Kingdom. Several days after the tornado outbreak, the high-pressure anticyclone to the south of the British Isles broke down, allowing colder arctic air to move in from the north, resulting in the start of a record-breaking cold wave.


Confirmed tornadoes


See also

*
List of European tornadoes and tornado outbreaks ''Parent article:'' List of tornadoes and tornado outbreaks These are some notable tornadoes, tornado outbreaks, and tornado outbreak sequences that have occurred in Europe. Pre-20th century 20th century 21st century See also * Li ...
* 1091 London tornado * 1761 Great Malvern tornado * 2005 Birmingham tornado * 2006 London tornado


References

{{Authority control Tornadoes in the United Kingdom United Kingdom Tornado outbreak Tornado outbreaks United Kingdom Tornado outbreak United Kingdom Tornado outbreak Weather events in England
Tornado outbreak __NOTOC__ A tornado outbreak is the occurrence of multiple tornadoes spawned by the same synoptic scale weather system. The number of tornadoes required to qualify as an outbreak typically are at least six to ten, with at least two rotational l ...
Tornado outbreak __NOTOC__ A tornado outbreak is the occurrence of multiple tornadoes spawned by the same synoptic scale weather system. The number of tornadoes required to qualify as an outbreak typically are at least six to ten, with at least two rotational l ...