Ever wondered why our forecasts for 5 days and beyond are written on the scale of the UK as a whole? When looking at forecasts beyond five days into the future the chaotic nature of the atmosphere starts to come into play - small events currently over the Atlantic can have potentially significant impacts on our weather in the UK in several days' time. Therefore whilst we can still forecast the general feel of the weather to a relatively high level of accuracy using our ensemble models, it becomes harder to offer local detail to as high a level of accuracy as our shorter range forecasts. For this reason our text forecasts for 5 days and beyond are written on the scale of the UK as a whole.
Long range forecast
Long range forecast
Thursday 16 May - Saturday 25 May
Changeable with showers developing by day across the UK during the latter part of the week and over the weekend. The heaviest showers and greatest risk of thunderstorms across southern parts. Temperatures generally around or just a little above average, though with winds tending to be light, still feeling warm in sunnier areas. Over the weekend there are signs that showers may start to ease from the north with drier, more settled conditions probably becoming established for a time. Confidence lowers into the following week with signals unclear how prolonged the influence of higher pressure will be. So after a potentially more settled spell of weather, unsettled conditions are likely to return during the week with the wettest conditions in the west. Above average temperatures more likely than below.
Sunday 26 May - Sunday 9 Jun
Signals during this period are weak and offer limited guidance beyond climatology. Similar weather conditions to those of the preceding few days are most likely to characterise this period to the end of May; a mixture of unsettled periods with rain and showers and settled interludes in-between. By early June, the chances of above and below average rainfall are evenly balanced. There is a slightly higher likelihood of above average temperatures compared with below average temperatures, such that the chance of hot spells, although still very small, is slightly higher than normal too.
Why isn't there more detail in the long range forecast?
Our long range forecast (which is updated on a daily basis) provides an indication of how the weather might change, or be different from normal, (i.e. warmer, colder, wetter, drier) across the whole UK. Met Office meteorologists consider output from a range of weather models when writing these forecasts. These models include those from the Met Office as well as models from other global forecasting centres such as the European Centre for Medium Range Weather Forecasts ( ECMWF).