I was thinking more about tides and thought we could talk more about this complex subject. Yesterday we talked about how high tide happens about 5 hours later in Vancouver than Astoria on the Columbia.

Today we’ll look at tidal range, the height difference between high and low tides and how that is also different between different places on the river. And a look at how fast the tide rises – is it uniform, and is there a way to tell how fast it will rise?

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