Is 0.04 inches of rain?

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I keep seeing it on my weather app and I don’t know what it means.

In: Earth Science

If you leave a cylindrical container in the rain (actually, any regular shape with straight sides), 0.04 inches is the depth of the water captured.

Usually these are the product of the certainty of precipitation and the percentage of the forecasted area receiving it. So if there is a 40% chance of rain in the forecasted area but the system will likely only drop 0.5 inches in the affected areas and only 20% of the total forecasted area will likely get that 0.5 inches. 0.4 x 0.5 x 0.2 = 0.04

Hence the forecast averages it out for the entire forecast area as 0.04 inches.