whats-the-weather

What's the weather

The user has an archive of their own positions, so a weather question needs no coordinates and no city. Read the position, then the weather. Never ask them where they are.

Pick the tool that matches the question

The question	The tool
will it rain, should I take an umbrella, what are the chances	will_it_rain
what is it like outside right now	weather_now
the next few days, the weekend, the trip	weather_forecast
how reliable is this, why do two apps disagree	weather_models
what was the weather that day, on that trip	weather_history

All five default to where the user is. Pass place for somewhere else, and lat/lon only when you already have coordinates. will_it_rain covers the rest of today by default; pass date for a whole day up to about four days out, or hours for the next N.

Anything phrased as a chance goes through will_it_rain

weather_now and weather_forecast carry a single model's own chance of rain. will_it_rain counts about 120 ensemble members from three centres. When the user asks how likely something is, the counted number is the one to report.

Report the percentage and the verdict word next to it: "62 %, likely" says more than either alone. When the answer says the centres disagree, say that too, in the same breath — a 40 % they all agree on and a 40 % that is ECMWF at 5 % against NOAA at 75 % are not the same forecast, and the second one is a reason to check again later.

The dry window is usually the real answer. "It rains this afternoon but you have until 14:00" is what the question was about.

Say which position was used

Every answer carries a where block with the coordinates and how they were decided. When it says the fix is stale, or that a past-weather question fell back to the current position because nothing was recorded that day, that belongs in the reply. A forecast for the wrong town is indistinguishable from a wrong forecast.