Drought in the United Kingdom - wikipedia Drought in the United Kingdom Droughts are a relatively common feature of the weather in the United Kingdom, with one around every 5 -- 10 years on average. These droughts are usually during the summer, when a blocking high causes hot, dry weather for an extended period. However droughts can vary in their characteristics. All types of drought cause issues across all sectors, with impacts extending to the ecosystem, agriculture and the economy of the whole country in severe cases of drought. The south east of the country usually suffers most, as it has the highest population ( and therefore demand ) and the lowest average precipitation per year, which is even lower in a drought. Even in these areas in severe droughts, the definition, impacts, effects and management are all minimal in comparison to drought prone areas such as Australia and parts of the United States. In recent years however, the summers of 2007, 2008, 2009, August 2010 and 2012 were wetter than normal, 2007 being wettest on record. Contents 1 Definition and comparison with other countries 2 Causes 3 Notable events 3.1 Meteorological droughts 3.2 Hydrological droughts 4 Impact 5 Responses and management 6 See also 7 References 7.1 Bibliography Definition and comparison with other countries A drought is usually defined as an extended period of weather ( usually around 3 weeks ) when less than a third of the usual precipitation falls. In the United Kingdom an absolute drought is currently defined `` as a period of at least 15 consecutive days when there is less than 0.2 mm ( 0.008 inches ) of rainfall '', although before the 1990s a drought was defined as `` 15 consecutive days with less than 0.25 mm ( 0.01 inches ) rain on any one day ''. This previous definition sometimes led to confusion, as many argued, `` if less than 0.25 mm of rain each day fell in 30 days, is that 2 droughts ? And if 0.26 mm fell after 25 days, is the drought over ? '' This led to the new definition, but many believe hindsight is the best way to judge if a drought has occurred. In the longer term, drought in the United Kingdom can also be defined as `` a 50 % deficit over three months, or a 15 % shortfall over two years ''. Compared to other countries, the United Kingdom definition of a drought is much less severe. In Libya in the Sahel region, a drought is usually only recognized after two years without any measurable rainfall. If this were to happen in the United Kingdom, the consequences would be disastrous. A different type of drought is the hydrological or agricultural drought. In this case there is moisture in the soil, but little is getting to vegetation, either because it is frozen ( which can occur in severely cold winters in the United Kingdom ) or because of very high temperatures which mean that the rate of evapotranspiration exceeds the rate of uptake of water from the plant ( which can be seen in the United Kingdom, on hot days, when plants wilt as their stores of water are depleted ). A hydrological drought can occur after a relatively dry winter, when the soil moisture storage, reservoirs and water table have not risen enough to counteract the warm summer weather. These sorts of conditions can persist over several years, even with above average rainfall, as the rainfall only slowly percolates through the water stores and replenishes them. Causes The main cause for a long spell of dry weather in the United Kingdom is usually a blocking anticyclone ( often the Azores high ) system that forces other low pressure systems around it, usually to the northwest. This can happen any time of year, but brings hot sunny weather in summer and dry, cold and foggy weather in winter. This is why in dry spells the northwest of the United Kingdom actually often receives above average rainfall, as depressions and associated fronts are pushed towards the north. A severe drought in the United Kingdom needs to have the high pressure in charge of the weather for an extended period, commonly for weeks or even months at a time. Most often sea surface temperature anomalies in the Atlantic and intensification of the mid latitude westerlies in the Pacific can bring a stable anticyclone, meaning that the pressure can remain above average for weeks, or even months at a time, allowing the heat to build and dry weather to continue during the anticyclonic system. Notable events Several notable droughts in the United Kingdom have occurred in recorded history, some of these in the 21st century. They can be divided into two categories, the meteorological drought where little or no rain fell over a relatively short period and the hydrological drought, where below average rainfall has occurred over an extended period. Meteorological droughts One of the most severe meteorological droughts in recent times was in 1976, when a dry 1975 - 76 winter was followed by one of the hottest and driest summers since records began. The drought effectively began in October 1975, but with low temperatures and therefore low evaporation rates during the winter, the below average rainfall did not present an immediate problem. As the dry winter ended and was followed by the hot and particularly dry summer of 1976, the drought became one of the most famous in United Kingdom history. The drought became a serious problem in late spring. In April, no rain fell in parts of Cornwall ; and then in June, no rain fell over Devon and Kent. In August no precipitation was measured in North Wales. This meant that in some places, less than half the average rainfall was measured from October 1975 to August 1976. For example, in Kew, just 235 mm ( 9.25 inches ) of rain was measured over that period, which was 43 % of the average, meaning the amount of rainfall was comparable to a semi-arid climate. In Devon and Dorset, some locations received no rainfall for 45 consecutive days through July and August, another United Kingdom record. This was on top of another three periods of absolute drought, totalling 58 days with no measurable precipitation. The lack of rain can be attributed to the high pressure system over the United Kingdom at the time, which meant average pressure was 5 millibars above the expected for the summer months. This drought was intensified by the exceptional heat that continued through it. Records were set for the heat as well as the lack of rain, resulting in very high evaporation rates. From 23 June, temperatures were over 32 ° C ( 90 ° F ) for two consecutive weeks around the United Kingdom, peaking at 35.6 ° C ( 96.1 ° F ) on 28 June at Mayflower Park in Southampton. This still is the highest ever June temperature since records began. The highest temperature in the summer was 35.9 ° C ( 96.6 ° F ) at Cheltenham on 3 July. The effects of the drought included substantial and long - lasting changes to the tree composition of forests. The European Beech was severely affected by the drought and took around twenty years to recover. To date, its growth has failed to recover completely, reaching only about 75 % of their pre-drought growth rates, even decades after the drought. Additionally, death due to drought resulted in the loss of around 15 % of the mature beech trees in the forest. In contrast, the sessile oak did not suffer any death or growth suppression due to drought, but instead benefited from reduced competition with beech. Sessile oak growth increased suddenly after the drought and remained unusually high until the 1990s, when beech recovered and regained dominance. European Beech dominates temperate forests over large areas of Europe, but is considered to be particularly drought - sensitive and is predicted to be outcompeted by more drought - tolerant species in many regions as the climate warms. Another event like the 1976 drought was in the summer of 2003. This was also notable for the temperatures, with 100 ° F being hit in the United Kingdom for the first time since records began, with a top temperature of 38.5 ° C ( 101.3 ° F ) recorded in Faversham, Kent, and some places recording up to, or above, 40 ° C ( 104 ° F ) unofficially. This drought and the associated heat wave affected the whole of Europe, not just the United Kingdom, as with the 1976 event. The average temperature was the highest since 1868, measured over February to September. This added to the severity of the drought, with high rates of evaporation. The summer ranked as the 4th highest for potential evaporation since 1961, and this evaporation alone exceeded rainfall totals across a third of the United Kingdom. The United Kingdom had its driest February to October period since 1921, and in the drought period had conditions only comparable to the previous conditions of 1976. Over the whole of the United Kingdom, the rainfall totals were the 3rd lowest since records began in 1900, and in some regions only 25 % of the average rainfall fell in this period. Scotland suffered during this period as it had its driest spell since the 1955 drought, and coupled with a dry winter here ( England and Wales had relatively wet winters as depressions were forced south ) this led to a hydrological drought here too. Also, with several local convective thunderstorms missing specific areas, some localities had exceptionally low rainfall totals, compared to the average, with some places having their driest February to October since 1697. The drought ended in October when a low pressure system finally arrived to bring substantial rain to the United Kingdom. Some areas in Southern England had more rain in this 6 day period than they had received in the previous 3 months. Fortunately the preceding winter of 2002 - 2003 was relatively wet, which reduced the severity of the drought greatly, unlike the dry 1975 - 76 winter which led into 1976. Hydrological droughts A significant hydrological drought occurred in the United Kingdom between 1995 and 1998, when the warm, dry summers were followed by dry, cool winters. This meant that over the three years, the lack of winter precipitation failed to counteract the dry summers, so slowly the water table fell, and reservoir water levels began to fall. Water levels were only replenished after some exceptionally wet years from 1999 to 2002. Similar conditions were felt between 2003 and 2006, with only the record breaking rainfall of 2007 and 2008 replenishing the water levels. Impact United Kingdom droughts have similar consequences to other droughts elsewhere in the world. The first of these is river and reservoir levels begin to drop as rainfall fails to counteract evaporation. As drought conditions continue, groundwater levels drop and this provides excellent conditions for fires to develop. With hot, dry weather and no moisture underground, trees lose moisture and become very flammable in dry conditions. This leads to wildfires which usually is the main impact of drought in the United Kingdom, with moorland vegetation such as heather badly affected as the peat bogs dry out. Also, these fires can continue, even when seemingly put out, as the smoldering peat re-ignites the dry vegetation. However, during severe droughts, many trees can burn, and people 's lives can be at risk, as in the 1976 drought when a fire encroached on a hospital, and only a wind direction change saved the patients ' lives. As embers can be transported easily, and if drought is severe enough, fires can start miles away from their original position as they are transported by wind and even dust devils. With these situations, roads are often closed to prevent loss of life and further damage. These fires also can destroy wildlife habitats, and this can also threaten wildlife. Often, in severe droughts, crops can fail as the soil does not contain sufficient moisture to keep them alive and this is usually the largest economic impact with £ 500 million ( $830 million ) worth of damage from failed crops in 1976. Another, more subtle impact is the insurance claims from damage to houses and businesses from fire and subsidence ( caused by the dry and shrunken soil ), sometimes amounting to over £ 50 million ( $83 million ) in severe droughts. Responses and management The responses to drought in England are managed by the Environment Agency. There are four stages to drought management, applying to both businesses and homes. The first of these is a media campaign, urging people to save water and thus avoid the need to take specific measures. For example, use a water butt to collect any rainfall. If drought continues, and water levels continue to decrease, further measures are brought in to save water. This includes a hosepipe ban, which forbids the use of hosepipes, and can be applied to hot tubs, pressure washers and other similar devices in a future drought. These measures were brought in, particularly the ban on hosepipes, in 1976 and 2006. The third stage involves conserving any non-essential supplies of water. These measures are brought in when no precipitation is forecast and water supplies are already very low. The options include : widening the hosepipe bans, to include sprinklers, drastic measures such as banning cleaning of buildings, vehicles and windows or the filling of swimming pools. These measures were also brought in during the 1976 drought. The fourth and final stage involves drastic measures of water rationing to all businesses and homes in the United Kingdom in an emergency drought order. The measures are brought in only in exceptional conditions of extended periods with little or no rainfall. This means no water supplies at certain times of the day, or allowing water for a specific amount of time. Standpipes and water tankers can be used as a last resort to have only set amounts of water given to each household in a neighbourhood. Again, these measures were used during the 1976 drought. Also, each area in the United Kingdom has its own drought plan, for the event of any future drought. See also Sahel drought 2003 European heat wave 1976 United Kingdom heat wave 2006 European heat wave Climate Change References Jump up ^ `` Drought in the UK ''. BBC. Retrieved 2009 - 09 - 01. ( dead link ) Jump up ^ `` 2006 Drought in the South East ''. BBC. Retrieved 2009 - 09 - 01. Jump up ^ `` 2007 ' probably wettest UK summer ' ''. BBC News. 2007 - 08 - 31. ^ Jump up to : `` Drought ''. Weather Online. 2009. Retrieved 2009 - 09 - 01. Jump up ^ `` Drought in the UK ''. Retrieved 2009 - 09 - 01. ^ Jump up to : Eden, Philip ( 2007 ). `` Water Shortage Coming ? ''. Weather Online. Retrieved 2009 - 09 - 01. ^ Jump up to : Currie, Ian. `` The 1976 Drought ''. Retrieved 2009 - 09 - 01. Jump up ^ Cavin, Liam. `` Extreme drought alters competitive dominance within and between tree species in a mixed forest stand ''. Functional Ecology. Retrieved 9 October 2013. Jump up ^ Marsh, Terry ( 2003 ). `` The UK drought of 2003 - an overview ''. Centre for Ecology and Hydrology Wallingford. Retrieved 2009 - 09 - 01. Jump up ^ `` Types of restrictions on public water use in a drought ''. Retrieved 2009 - 09 - 01. Jump up ^ Herbert, Ian ( 2006 - 05 - 17 ). `` Drought of 1976 brought standpipes and shared baths ''. London : Independent. Retrieved 2009 - 09 - 01. Jump up ^ `` Drought Plans ''. Retrieved 2009 - 09 - 01. Bibliography The Great Drought of 1976. Evelyn Cox ( 1978 ). Hutchinson, Readers Union Group ISBN 0 - 09 - 133200 - 1 Weather events in the United Kingdom Climate of the United Kingdom Drought in the United Kingdom Avalanches Lewes 1836 Buachaille Etive Mòr 2009 Coldwaves Winter 1683 -- 84 Great Frost of 1709 Winter 1894 -- 95 Winter 1946 -- 47 Winter 1962 -- 63 Winter 1981 -- 82 Winter 1985 -- 86 January -- March 1987 Winter 1990 -- 91 October 2008 February 2009 Winter 2009 -- 10 Winter 2010 -- 11 February 2012 March -- April 2013 February -- March 2018 Snow events January 1881 April 1981 Early March 2013 Late March 2013 March 2018 Flash floods Louth 1920 Lynmouth 1952 Chew Stoke 1968 Glasgow 2002 Boscastle 2004 Morpeth 2008 Floods Holmfirth 1738, 1777, 1944 Thames 1928 Thames 1947 South England 1968 Autumn 2000 Summer 2007 Sheffield 2009 November -- December 2009 April 2012 to Early 2013 Winter 2013 -- 14 Somerset Levels 2013 -- 14 Winter 2015 -- 16 June 2016 Storm surges South England 1287 North Sea 1287 Bristol Channel 1607 1928 Thames flood North Sea 1953 North Sea 1976 North Sea 1978 North Sea 2007 Irish Sea & North Sea 2013 Thunderstorms Widecombe - in - the - Moor 1638 Tornadoes London 1091 Great Malvern 1761 England and Wales outbreak 1981 Birmingham 2005 London 2006 West Midlands and Wales outbreak 2011 Windstorms December 1703 November 1824 August 1848 October 1859 February 1871 December 1879 October 1881 January 1968 January 1976 October 1987 January 1990 December 1998 January 2007 December 2011 January 2012 October 2013 December 2013 Christmas 2013 New Year 2014 February 2014 Windstorm seasons 2015 -- 16 Abigail Desmond Eva 2016 -- 17 2017 -- 18 Ophelia Heat waves Droughts `` Great Stink '' 1858 August -- September 1906 Summer 1911 Summer 1955 Summer 1976 August 1990 Summer 1995 August 1997 2003 June -- July 2006 July 2013 June -- July 2018 Wildfires June -- July 2018 Other Great Smog of Winter 1952 Disputed tsunami Drought in Europe Sovereign states Albania Andorra Armenia Austria Azerbaijan Belarus Belgium Bosnia and Herzegovina Bulgaria Croatia Cyprus Czech Republic Denmark Estonia Finland France Georgia Germany Greece Hungary Iceland Ireland Italy Kazakhstan Latvia Liechtenstein Lithuania Luxembourg Macedonia Malta Moldova Monaco Montenegro Netherlands Norway Poland Portugal Romania Russia San Marino Serbia Slovakia Slovenia Spain Sweden Switzerland Turkey Ukraine United Kingdom States with limited recognition Abkhazia Artsakh Northern Cyprus South Ossetia Transnistria Dependencies and other entities Åland Faroe Islands Gibraltar Guernsey Isle of Man Jersey Svalbard Retrieved from `` https://en.wikipedia.org/w/index.php?title=Drought_in_the_United_Kingdom&oldid=851954392 '' Categories : Weather events in the United Kingdom Environment of the United Kingdom Droughts in Europe Hidden categories : Use dmy dates from March 2014 Use British English from March 2014 Talk Contents About Wikipedia Add links This page was last edited on 25 July 2018, at 17 : 19 ( UTC ). 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Question: when was the last time the uk had a drought
Answer: 2006