NOAA – 2019 State of U.S. High Tide Flooding with a 2020 Outlook

EXECUTIVE SUMMARY

Sea level rise flooding of U.S. coastlines is happening now, and it is becoming more frequent each year. This flooding typically occurs when ocean waters reach 0.5 meter (m) to 0.65 m above the daily average high tide and starts spilling onto streets or bubbling up from storm drains. Evidence of a rapid increase in sea level rise related flooding started to emerge about two decades ago, and it is now very clear. This type of coastal flooding will continue to grow in extent, frequency, and depth as sea levels continue to rise over the coming years and decades.

2019 State of U.S. High Tide Flooding with a 2020 Outlook

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