this post was submitted on 14 Nov 2025
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[–] tal@lemmy.today 8 points 2 days ago (2 children)

0.78 inches in one go causes widespread flooding there? Crazy.

More than that. From the article, that's just what they normally get in November.

the area — which receives an average of 0.78 inches in November

There will be two rounds of wet weather, with the first round expected to bring 1 to 3 inches of rain on Friday night.

The second round of rain is expected Saturday and will be more significant, potentially bringing heavy rainfall, gusty winds, small hail and isolated tornadoes.

A widespread 2 to 6 inches of rain, with higher amounts possible in some areas, is expected through Saturday across much of Southern California.

For perspective, average annual precipitation:

https://www.currentresults.com/Weather/US/average-annual-precipitation-by-city.php

Baltimore, Maryland: 45.0 inches

Los Angeles, California: 14.3 inches

So imagine a little more than tripling the numbers there to get a feel for what might be comparable in terms of percentage of rain they'd normally get. For Baltimore, it'd be like maybe 6 inches to 18 inches in under two days.

[–] prettybunnys@piefed.social 4 points 2 days ago

For comparison, the 2018 Ellicott City flood (the 2nd hundred year flood in 2 years) in a city just south of Baltimore was over 9 inches of rain.

Which is roughly two months of rain in a single day.

LA is a much worse city wrt drainage than Ellicott city and its surrounding “suburbs” make it.

[–] rumba@lemmy.zip 1 points 2 days ago

I mean, I just looked up their current month.