Forecasting the Weather Forecasting Weather forecasts provide critical information about the weather to come. There are many different techniques involved in weather forecasting, from relatively simple observation of the sky to highly complex mathematical models run on computers.
Weather prediction can be for the next day, next week, or next few months.
The accuracy of weather forecasts however, falls significantly beyond about 10 days. Weather forecasting remains a complex business, because the weather can be so chaotic and unpredictable. If weather patterns are relatively stable, the persistence method of forecasting provides a relatively useful technique to predict the weather for the next day. If it is hot and sunny on one day, it is likely to be hot and sunny the next. Unfortunately, in many areas of the world the weather is more unpredictable and changeable than that, particularly in the mid-latitudes where depressions influence much of the weather.