The severity of today’s flash flood “has climatologically <1% chance of occurring in a given year.”
Floods that were once rare (“100-year floods”) are now expected to happen more regularly.
I learned in FSC hearings that certain key flood maps haven’t updated in *decades.* 🌎
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Flash Flood Emergency for the District and northern Virginia suburbs. #DCA measured 3.3” in an hour; that has climatologically less than a 1% chance of occurring in a given year. twitter.com/NWS_BaltWash/s
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