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of the team working at Cardington. Ongoing research  The Met Office and NPL’s Sensor Assurance Framework research at Cardington has been undertaken for around two years, with the aim to test sensor performance against as many different weather types as possible, including rain, hail, sunshine and fog

: -8 °C Chance of precipitation: 40% Average wind speed: 6 mph Sunny and very warm Highest daily temperature: 36 °C Lowest daily temperature: 23 °C Chance of precipitation: 10% Average wind speed: 4 mph Gust speed: 8 mph Heavy rain turning into hail in the afternoon Highest daily temperature: 10 °C

and coastal mist will affect much of eastern Britain, gradually retreating to coastal areas through the day. Scotland and Northern Ireland will start the day fine, but showers will develop, some of which may be heavy with a risk of thunder and hail, particularly in southeastern Scotland and northeastern

, a band of rain is set to sweep across southwest England and South Wales during the early hours, before pushing eastwards. Simultaneously, another system will descend from the north, bringing intense showers to Wales and southern and central England. Some of these could include thunder and hail

to the development of cumulus clouds, the fluffy, white clouds often seen on fair-weather days. When convection is particularly strong, the rising air can reach higher altitudes before cooling, forming cumulonimbus clouds. These clouds are associated with heavy rain, lightning, thunder, and sometimes hail

of these massive clouds show a fibrous or striated structure that frequently resembles an anvil (facing page, top left), plume, or huge mass of hair (facing page, bottom left). They may occur as an isolated cloud or an extensive wall (facing page, 3rd row right). Squalls, hail and/or thunder often accompany them

at times and squally, especially along its trailing edge. As the system clears, colder air will follow, allowing clusters of showers to develop. These showers may be heavy, with the risk of hail and thunder, and snow is possible again over higher ground. Sunday afternoon looks wet and blustery for many

- a long cloud of smoke, ash or vapour sometimes resembling a feather as it spreads from the source of the cloud. Precipitation – Water that falls from the clouds as rain, snow, hail, sleet Variable - In computer programming we use variables to store information that might change and can be used later

late Friday over northern France and moving into the UK overnight. The southeast, including East Anglia and the southeast of England, is most at risk. These storms could bring torrential rainfall (over 50mm in a few hours), hail, gusty winds, and frequent lightning. A yellow thunderstorm warning

of Wales, where there is a significant risk of heavy, thundery downpours. Rainfall totals could reach 25 to 35mm in just an hour, with up to 60mm possible over a few hours. These conditions may lead to localised flash flooding, accompanied by frequent lightning and hail. A warning has been issued