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How can legit weather services provide such radically different predictions?

groston

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southeast Michigan
Three weather services, three very different forecasts for this coming Saturday, i.e., two days from now:
1 - weather.com: High temp 80F, partly cloudy, 15% chance of rain
2 - api.openweathermap.org (into a small program I wrote): High temp 77F, thunderstorms
3 - 1weather (on my Android phone): High temp 77F, mostly clear, 21% chance of rain

I am certainly not a weather expert, but I am very surprised that three, supposed legitimate sources, would have forecasts that vary so widely. Any comments?
 
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