General Weather/Earth Sciences Topics > Weather Conditions Discussion

What is "heavy rain"?

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--- Quote from: CW2274 on September 20, 2022, 02:19:28 AM ---
--- Quote from: hofpwx on September 20, 2022, 12:54:55 AM ---Likewise, what is “raining cats and dogs”?

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It's Davis's attempt at weather humor. When the rain rate reaches, I believe, 0.30" per hour, this pops up in the ticker display.

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I figured an attempt at WXwit but was also a bit curious about the threshold. Thanks!

What I've used in the template set is
--- Quote ---    Light rain — rate is < 2.5 mm (0.098 in) per hour
    Moderate rain — rate is between 2.5 mm (0.098 in) - 7.6 mm (0.30 in) or 10 mm (0.39 in) per hour
    Heavy rain — rate is > 7.6 mm (0.30 in) per hour, or between 10 mm (0.39 in) and 50 mm (2.0 in) per hour
    Violent rain — rate is > 50 mm (2.0 in) per hour

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I think I'd used a Davis doc (in 2011) for those values. 

Violent rain? Seems a touch overly dramatic to me. I've always liked "toad choking"..

Ahh.. dug into the past.. I'd used the AMS definitions (light,moderate,heavy) and the WMO (violent).


--- Quote from: dwaldmann on September 19, 2022, 08:13:10 PM ---Wondering if my new Davis Instruments Aero Cone is giving false readings or if the old one just never properly accounted for our wind conditions here. I don't recall (and don't have access to historical records) what previous amounts were, but last week I got over 3" rain rate and today 5.76". Is that even possible?

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Happens all the time. Recently almost 10 inches.
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