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Climate Change is real. Did Humans cause it? No. It's a cycle and we're in the time we're in. It's like this... The Earth has a cycle. Every so often the Earth warms before it cools. With absolutely no interference, the cycle may fill an imaginary bucket to 97% full. This has been the way of it since "the beginning". But now humans have thrown something into the equation that could cause the bucket to fill to 102% thereby overflowing the bucket. What will be the harm to the Earth? Very little since the Earth has gone through cataclysmic cycles before. The real question should be "How will it affect Humans - and other life on the planet".
With that said, it might be in our best interest to cut back as much of the added influence Humans cause and allow Earth to complete it's cycle. It won't kill us if we don't help it to do so.
This is just my own ideas based on how I feel... Many weather forecast algorithms have been based on past weather behavior. With Climate Change occurring, the weather is absolutely fluid - it has no rock solid base reference. As you say, the forecasts used to be spot on and now they aren't as accurate as they once were. Could that be because climate change has changed the base reference standard? It may be time for the models to 'upgrade' the way the forecast is compiled. It isn't the fault of Windy, they are an aggregate system combining many data sets for consumption all in one place.
I used to use Weather Underground but since IBM acquired them, IBM is doing what they do best - destroying a once workable site into a bollixed mess of useless information and dead links.
Windy is at least trying.
(No I'm not a paid shill, just someone looking for something that will meet my needs and so far Windy seems to be that source.)