Nate Silver's The Signal and the Noise's chapter about weather forecasting described forecasters during a visit doing that, a manual tweak essentially based on experienced intuition at the end that the models couldn't yet replicate.

About 10 years ago, I dropped into our local meteorology office on my lunch break to ask about the weather for a week long bush walk I had planned. It was amazing too see how much local knowledge the guy there could apply to the official BOM forecasts to make them more meaningful! Models are great, and have improved significantly since then, but human experience is also amazing!

Is metrology a typo, or are there countries that call it metrology instead of meteorology?

In the US metrology is a specific field dealing with measurement, often the department dealing with high precision calibrating/measuring tools in the metal machining industry.

> In Sweden we also have a local metrology bureu which produces much better forecasts than most others

Ironically Sweden’s best weather forecast comes from Norway [0]

[0] https://news.ycombinator.com/item?id=31965812