On 14 October 2023, you will be docking at the Southern Branch Elizabeth River, VA at the second low tide. The berth is located between NOAA reference tidal station #8638660 and subordinate station #8639348. What time (LST) will you be docking? Illustration D063NG
• Using NOAA tide prediction tables for reference and subordinate stations • Finding the second low tide time for each station on the same date • Interpolating for a location between two tide stations by averaging times and heights
• From Illustration D063NG, what are the listed times of the second low water on 14 October 2023 at station 8638660 and at station 8639348? • If your berth lies roughly midway between these two stations, how would you estimate the low water time there using the two known times? • After you combine the two times, which multiple-choice option most closely matches your calculated result in Local Standard Time (LST)?
• Be sure you are using the second low tide on 14 October, not the first low or any high waters • Confirm that both stations use the same time zone: LST so no conversion is needed • When interpolating, carefully convert the two low-water times into minutes, find the midpoint, then convert back to HHMM format before comparing to the choices
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