a 60% chance of rain?

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a 60% chance of rain?

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forecast area. i.e.) San Fernando Valley. Second, this percentage is valid only within a specific time frame; usually within a 12-hour time frame. Third, it is a percentage that says that AT LEAST 0.01″ of ppt. will fall at ANY POINT within the specific area within the next 12 hours (or whatever the time frame is.) Anything less than .01″ of ppt is considered trace ppt, and does not fall into the measurable ppt category.

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