📚 How to solve these questions: 12 tips for all 6 Interactive Reading question types, with a worked example for each.
Every forecast you see began as a set of numbers describing the atmosphere at one moment: temperature, pressure, humidity, and wind, measured at thousands of points from the ground up. A computer then applies the 1 of moving air and reports where those numbers will be in six hours, in a day, in a week. The method works, and it has improved steadily. A five day forecast today is about as 2 as a two day forecast was in the nineteen eighties. Most of that gain came from better measurements rather than cleverer equations, and satellites did most of the work by filling in the oceans, which had been almost blank on the old maps. There is a 3 that no amount of computing will remove. The atmosphere amplifies small differences, so two starting points that differ by less than any instrument can detect will produce different weather within a fortnight. Forecasters handle this by running the model many times from slightly different starting conditions and reporting how often each outcome appears. This is what a percentage on a weather app actually means, and it is routinely 4. A thirty percent chance of rain is not a weak promise of rain. It is a statement that in thirty of a hundred runs, this situation produced rain where you are. The forecast was not 5 when the day stayed dry, though it will be remembered that way.