1-in-1,000 year rains delivered by Florence

Preliminary maximum 72-hour Average Recurrence Interval (ARI) of the rainfall from 14Z September 14, 2018 through 13Z September 17, 2018. This was created using hourly Quantitative Precipitation Estimates (QPEs) from MetStormLive, a gauge-adjusted DualPol-radar based precipitation system operated by MetStat, and updated precipitation frequency grids, also produced by MetStat in 2014. A wide swath of North Carolina and a small section of South Carolina experienced 72-hour rains that on average occur every 1,000+ years (have a .1% chance of occurring in any given year). Note that a 1-in-1000 year rainfall event is not the same as a 1-in-1000 year flood, which depends on more than just rainfall. Image credit; MetStat, Inc.

Published by Category 6 at Weather Underground.