this post was submitted on 14 Sep 2023
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English "Everything" user here. Sorry.
Liters/meter^2
Is this a common unit for weather? I translated the post text and the climate/drought makes sense.
I just haven't ever seen the USA national weather service use the volume over area units like that. Mostly like a depth measurement.. X inches short of typical rainfall insert timeframe here..
I guess dimensionally it's the same, it just hits differently IMO?
Maybe the us national weather service just assumes a volume and doesn't say it? They kinda have to. If you say it rained x inches of rain in that hour, how do you know in what area? X inches over the whole country? Or per city? Per square inch? They have to measure the rainfall over a certain volume over a certain time. Otherwise you wouldn't be able to compare it.
You don't need the area to actually have a clue about the significance of a rain event. In the weather news you'll find expressions like "20 mm of rain". 20mm "water table" is the independent from the area as it means the same like 20mm/m² or 20mm/km².
You won't actually calculate the total amount of water (volume) coming down by multiplying it with the area of the rain event.