Does a '50% chance of rain in Boston' mean half of Boston will get rained on and the other half won't?
[...] the likelihood of occurrence of a measurable amount of liquid precipitation during a specified period of time at any given point in the forecast area. Measurable precipitation is equal to or greater than 0.01 inches. Unless specified otherwise, the time period is normally 12 hours.
In simple words, the PoP describes how likely it is for a measurable amount of rain to occur in any given point in the forecast area. It does not indicate the percentage of an area to be affected by rain, as some social media users have claimed. The NWS article continued:covered by precipitation at given time in the given forecast area or that you will be seeingAnd again:
If a forecast for a given county says that there is a 40% chance of rain this afternoon, then there is a 40% chance of rain at any point in the county from noon to 6 p.m. local time.Joslyn, Susan, et al."Probability of Precipitation: Assessment and Enhancement of End-User Understanding."
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