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3.1.1.3 Weather hazards (part a) circulation and UK weather GapFill
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Here in the UK, we talk about the weather all the time, much to the amusement of the rest of the world. But there is a reason - our weather is very changeable, and we get extreme events.
Our weather is dominated by two weather systems - anticyclones and cyclones. Cyclones are also called .
An brings stable weather during which the skies are clear. They create extreme weather if they become ‘stuck’ over the UK for a prolonged period. In summer temperatures rise average. A heat wave is when the daily temperature is more than 5°C above average for more than consecutive days. are also likely, and are defined when precipitation is lower than 0.2mm rainfall for more than 15 days.
In temperatures are lower than average. There may be a cold snap. Nights are very cold because the skies are , meaning that heat is lost to space. Snowfall is also likely if warm, moist air meets colder air - as seen during the Beast from the in 2018.
Depressions bring unstable weather conditions – they create extreme weather if they come rapidly one after another or are particularly strong (e.g. as a storm). Flooding can happen suddenly in the space of a few , e.g. during a storm or over a longer time period e.g. weeks or months of rainy days. A rapidly occurring flood is called a flood.
During the autumn and winter, we sometimes get storms with high wind speeds called , as well as heavy rain. Some of these storms are derived from hurricanes. Flooding is especially likely when there is a succession of storms, meaning that the ground is already saturated and rivers are . The extra rainfall cannot soak away, and rivers their banks.
Our weather is dominated by two weather systems - anticyclones and cyclones. Cyclones are also called .
An brings stable weather during which the skies are clear. They create extreme weather if they become ‘stuck’ over the UK for a prolonged period. In summer temperatures rise average. A heat wave is when the daily temperature is more than 5°C above average for more than consecutive days. are also likely, and are defined when precipitation is lower than 0.2mm rainfall for more than 15 days.
In temperatures are lower than average. There may be a cold snap. Nights are very cold because the skies are , meaning that heat is lost to space. Snowfall is also likely if warm, moist air meets colder air - as seen during the Beast from the in 2018.
Depressions bring unstable weather conditions – they create extreme weather if they come rapidly one after another or are particularly strong (e.g. as a storm). Flooding can happen suddenly in the space of a few , e.g. during a storm or over a longer time period e.g. weeks or months of rainy days. A rapidly occurring flood is called a flood.
During the autumn and winter, we sometimes get storms with high wind speeds called , as well as heavy rain. Some of these storms are derived from hurricanes. Flooding is especially likely when there is a succession of storms, meaning that the ground is already saturated and rivers are . The extra rainfall cannot soak away, and rivers their banks.