How High Were the Tides?
Last week we predicted abnormally high tides due to the full moon, a high pressure system over the Northeast, and a low pressure system developing off the coast. (Remember we're talking about the rise of water, like a hurricane storm surge, not the waves, which also spiked to nearly 18 feet at offshore buoys).
So how high were those tides? The NWS [JessePedia] in Philadelphia (Mount Holly, NJ) was kind enough to this statement:
I'm not sure I fully understand their chart* but the values which qualified for Moderate Flooding were:
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SEVERE FLOODING BEGINS: +8.7 FT
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Bilvalve, NJ: +8.4 FT
Philadelphia, PA: +8.4 FT
South Amboy, NJ: +8.2 FT
Cape May Ferry, NJ: +7.8 FT
Cape May Harbor, NJ: +7.8 FT
Sandy Hook, NJ: +7.7 FT
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MODERATE FLOODING BEGINS: +7.7 FT
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Even more locations qualified for "minor flooding" at +6.7 FT or higher.
*These readings are "Height of High Tide over Mean Lower Low Water" which, based on these definitions would mean (basically) the height of the high tide compared to the average low tide. So if I'm interpreting this correctly, there would always be some height between low tide and high tide, but we don't know what that height is. We do know that flooding begins at 6.7 feet, so anything above that was experiencing flooding.
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