Misunderstood Probablility

Misunderstood Probablility: Probability of precipitation is given on virtually every weather forecast, but many people don't really understand what it is and where it comes from.

 Let's test your knowledge of this important weather concept.

A probability of precipitation of 30% means:

 (1)  One expects precipitation for 30% of the time.
(2)  One expects precipitation over 30% of the area.
(3)   There is a 30% chance of precipitation at some point over a particular period.
(4)  That it will precipitate 30% of the time over 30% of the area over a particular period.

Read more ...

(from Cliff Mass Weather Blog)

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