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Tidal forecasts don’t show the effects of climate change yet, but why?

Measurements of sea level across the world show rising waters along most ocean coastlines, including the United States. But according to a story by WRLN in Miami, the regular forecasts for high and low tide do not take that rising water into account yet, leading to bigger errors in tide forecasts than would normally be expected. The problem is that the baseline sea level value that is used to forecast high and low tides is almost 20 years old, so the currently used baseline is too low compared to actual sea levels. The baseline is about to get updated, but with continuing sea level rises, this will soon also be out of date, leading to more errors that can cause problems for shippers and commercial fishers. You can read more and listen to the story here.

Mark Risse using an app to mark high sea levels in the recent East Coast flooding.