What do percentages on weather forecast apps mean?

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What do percentages on weather forecast apps mean?

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3 Answers

Anonymous 0 Comments

This percentage is the product of two values:

1) The probability/certainty of a weather event occurring, and
2) The fraction of land affected in the forecast area.

For example, 50% chance of rain over 50% of the forecast area results in a forecast of 25% rain, while a 100% chance of rain over 25% of the forecast area also results in a forecast of 25% rain.

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