Rain (Rainfall) Facts
Weather radar displays present rainfall intensity legends that report units of dBZ, which are decibels relative to "Z," with "Z" being the reflectivity factor.
One interesting tidbit not included in the table above is that technical difference between rain and a shower. Rain refers to precipitation from stratiform clouds like stratus and altostratus, and tend to occur over a large area for a long time. Showers originate from cumulus and cumulonimbus clouds and cover a relatively small area for a short time.
So, when somebody remarks that, "we have had a ton of rain," just how much rain is that?
Answer: 0.01 inches of rain over an acre of land equals 62,726 cubic inches, or 1.1 tons.
How fast does rain fall?
Answer: Around 30 km per hour (18.6 mph), depending on the updraft.
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