eli5 How do they calculate how many inches of rain has fallen?

541 viewsOtherPlanetary Science

Where I live it does not rain a lot. When it does the news always say that it rain 1/8 of an inch or so, but I can see that my pool has increased 2 or 3 inches.

I don’t think this could be from runoff as the edges if the pool are angles away from the pool to prevent runoff from entering the pool. I have also had buckets left out where there is significantly more water than was reported.

Any reasoning for this? Could the rain vary so much that the weather station is just getting a significantly different amount of rain?

Thanks

In: Planetary Science

6 Answers

Anonymous 0 Comments

Maybe the news is saying there was 1/8″ *in the past hour*, or *this afternoon*, whereas it’s been drizzling all day long?

But yes, the rainfall can vary in different places, of course. I live ten miles from my Sister, and I often get heavy rain while she has none, or vice-versa. The terrain is important. Air rising from hills creates heavier rain; flat areas gets less.

Finally, people (including news anchors) make mistakes.

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