The Met Office

The forecast information you see on maps is updated four times a day (forecast for the next two days) in the UK or twice a day (days 3-5 in the UK and all five days for non-UK locations).

Further quality control of the data can be carried out by the Duty Forecaster at BBC Weather Centre. Any changes made are sent to all of our outputs every half-hour, so the data you see on the website is the same as that you see on TV.