Why Do Forecasts Differ from One Website to the Next?

What often surprises people is that most online forecasts are automated; they’re generated by a machine.

They’re usually less accurate than those produced by a meteorologist because they rely solely on computer model data to generate their forecast. Without the influence of a human that has knowledge about local microclimates and regional weather phenomenon, their inaccuracy can be frustrating.

When there’s some form of human influence with the forecast, short-term forecasts (within a few days) are 80% to 90% accurate! However, a 10-day or longer forecast is only right about 50% of the time.
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