Even a week plus into the future…
In: Earth Science
They have very sophisticated programs that take decades of previous weather patterns and compare it to current weather patterns. Based on what is happening now the program (known as a model) gives you a handful of future weather patterns that are likely to occur from the current state.
Basically, past performance = likely future outcome. The further out into the future you go, the more possible outcomes there are which is why long term forecasts can be pretty inaccurate.
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