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generates between 130 and 540GB of output data, whilst the boundary conditions for a thirty-year experiment occupy 40GB. A hard disk size of at least 500GB is therefore recommended, although with careful data management by the user, smaller disks can be used. If power supplies are unreliable, PRECIS can

variable it is through the year or between years. By using historic information over a long period (ideally thirty years) an understanding of the normal climatological range and frequency is gained. A climate of a particular place is often described in seasonal periods (e.g. summer/ winter or rainy

occur alone. Future projections show UK-wide increases in the frequency and duration of thermal heat stress in dairy cattle and potato blight events. This study uses the UKCP regional projections to examine the effect of climate change on the dairy and potato farming sectors over the next thirty

. Comparing the latest 30-year averaging period (1991-2020) to the thirty years before that (1960-1991), observations show a 26% increase in temperatures above the average.   The most recent averaging sample of 1991-2020 shows 63% of days warmer than average and just 37% cooler when compared to the 1961-1990

Centre said: “Tide gauge records demonstrate that sea levels around the UK are continuing to rise as water warms and ice sheets melt. 11.4 cm in the past thirty years may not sound like much, but the rate of sea level rise is increasing, and each extra centimetre increases the danger of a major storm

be forgiven for thinking just about anything is a sign of rain: thirty of his thirty two signs in animals and forty two of his forty seven signs in birds are about rain, snow or bad weather. Richard Inwards, Weather Lore 1869 Texts such as these provide a source of amusement in today’s world

average periods 1961-1990 and 1991- 2020, the number of days <2°C has decreased by a third and <0°C by a half within this thirty-year period, as summarized in the table below. Count of days with UK area-average mean temperature < 2°C and <°0C for 30-year long term average periods. Period Meantemp < 2°C Meantemp < 0°C 1961-1990 1085 419 1991-2020 706 207 Author: Mike Kendon, Met Office National Climate Information Centre Last updated 10/01/2023

since November 2010, we are also able to include the equivalent hindcasts run on the same dates in 2011 and 2012, giving a total of thirty six hindcast values for each year. The forecast ice extent is bias corrected using the mean difference between the observed extent and the mean hindcast extent

periods from 1961-1990 and 1991-2020, the number of days where mean temperature for the UK was below 2°C has decreased by a third within this thirty-year period, and the number of days below 0°C has halved. These are dramatic changes.  “The fact that we’ve seen the warmest year on record for the UK

between six and thirty-six hours ahead at 3-hourly intervals (T+6 to T+36) and three new flight levels were added. 2020s: We've further refined our services, introducing higher resolution data and improved algorithms for turbulence and icing forecasts. Looking to the future Earlier this year we