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across England and Wales. The analysis chart at 1800UTC 10 December 2023 – 36 hours later – shows storm Fergus over Ireland with an occluded front wrapped around the low pressure centre. The visible satellite image at 1200UTC 9 December 2023 shows storms Elin (E) and Fergus (F) in a south-westerly

Pressure Chart Forecast Layer Mountain Area Text Forecast View Service Regional Extreme Obs Figure 2 Number of calls for data by product Access to DataPoint data is made available for free under an Open Government Licence. Some examples of the uses of DataPoint data are provided below. Flip-dot

. The isobars, lines of equal pressure on weather charts, will be packed more closely together, indicating stronger winds than we have seen recently. The probability plots used by Met Office meteorologists illustrate this transition clearly, with high pressure dominating during the early part

now open to Atlantic weather systems, the coming week is expected to be much more unsettled. Low pressure will replace high pressure as the dominant feature, bringing bands of rain, frequent showers, and gusty winds. The isobars, lines of equal pressure on weather charts, will be packed more closely

overnight 12 to 13 March. A further area of low pressure brought some very wet weather to western and northern areas on 14 March, with the last low of the sequence on 16 March 2019. The sequence of analysis charts below show the succession of low pressure systems affecting the UK: 0600 UTC 10 March, 0000

of similar atmospheric pressure. Charts showing isobars are useful because they identify features such as anticyclones (areas of high pressure), depressions (areas of low pressure), troughs and ridges which are associated with particular kinds of weather. High pressure or anticyclone High pressure

rainfall maps - calendar view These maps show daily rainfall for each day of August 2023 as daily totals. The daily rainfall is the total from 0900UTC on the day in question to 0900UTC the following day. Mon Tue Wed Thu Fri Sat Sun Monthly atmospheric circulation Mean sea level pressure These charts

as daily totals. The daily rainfall is the total from 0900UTC on the day in question to 0900UTC the following day. Mon Tue Wed Thu Fri Sat Sun Monthly atmospheric circulation Mean sea level pressure These charts show the monthly mean sea level pressure for April 2023 for the UK and north Atlantic, based

on the day in question to 0900UTC the following day. Mon Tue Wed Thu Fri Sat Sun Monthly atmospheric circulation Mean sea level pressure These charts show the monthly mean sea level pressure for June 2024 for the UK and north Atlantic, based on the ERA5 reanalysis (Hersbach et al, 2019), both as actual