It extremely difficult or impossible to make such small-scale, local weather forecasts as you might want.
Weather systems are many hundreds of miles across, and very chaotic within their overall patterns. Especially when crossing land, they contain large- and small- scale internal irregularities and are heavily affected by external factors, primarily topography.
Nature works to large-scale patterns, not decimal-point precision (or accuracy?), NGR-scale land areas and timetables! Nor does it worry about mere ‘ooman leisure activities, be those firework displays or running miniature railways.
It is unfair on the meteorologists to think they can supply us with precise, purely-local predictions that always suit our wishes. (I am not one, by the way, so have no vested professional interest!)
For example…..
I live in a coastal area, a triangle of land projecting into the English Channel, backed by an E-W ridge averaging 400 feet height. That ridge and the exposure to the sea tends to keep the area a tiny bit warmer in cold Winter weather than North of it; but we are also more exposed to the South-West winds than inland.
It also means we are usually less affected by the severe storms of the sort we have seen in recent times, because the centres of many of these cross the more Northerly parts of British Isles.
Yet we don’t have and can’t have specific forecasts for our small area, merely a couple of hundred square miles at most; just somewhat general predictions for our part of the South-West Peninsula. Indeed, because we are on an a coast open to the ocean that spawns Britain’s main weather systems, the Shipping Forecast (100 years old this year!) often gives a fairer indication of what to expect on that peninsula, than a general weather forecast for a broad, very long swathe of solid, hilly Southern England.
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There is though, potentially one very big fly in the ointment. I do not know if this is correct but I have been told the BBC obtains its weather forecasts from some service in the USA or Canada. If so I think that wrong and shameful, but it would partially explain forecasts being much more general than might be possible. It should be using our own Meteorological Office, and indeed it does for the Shipping Forecast.