# tides question

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• Jul 1, 2008, 06:30 PM
CharlieInOC
This week is a good example of why knowing the extent of the high and low tides is important. As some of you may have noticed, the mornings have been much better, from a tide stand point, then the afternoons. If you check the tide heights, you would notice that this morning's high tide was only a little over 3', wereas the high tide this afternoon is about 4.5'. Hence, the effect of high tide was much less this morning, which is especially noticable with the very small waves we have been "blessed" with lately. Stay tuned for lesson #2 at some point in the future.........
• Jul 1, 2008, 07:04 PM
wang
Quote:

Originally Posted by CharlieInOC
Stay tuned for lesson #2 at some point in the future.........

Thanks!!! I don't know how I've been surfing the last 12 years of my life without knowing this. Man, i guess it's just been luck that I paddle out to surf the nicest waves :rolleyes: jk

http://viewmorepics.myspace.com/inde...mageID=9929268
• Jul 2, 2008, 03:43 PM
Lumpy
Tide and Current Glossary
http://co-ops.nos.noaa.gov/publications/glossary2.pdf

mean tide level (MTL)—A tidal datum. The arithmetic mean of mean high water and mean low water. Same as half-tide level.

half-tide level—Same as mean tide level.

mean high water (MHW)—A tidal datum. The average of all the high water heights observed over the National Tidal Datum Epoch. For stations with shorter series, comparison of simultaneous observations with a control tide station is made in order to derive the equivalent datum of the National Tidal Datum Epoch.

mean low water (MLW)—A tidal datum. The average of all the low water heights observed over the National Tidal Datum Epoch. For stations with shorter series, comparison of simultaneous observations with a control tide station is made in order to derive the equivalent datum of the National Tidal Datum Epoch.

National Tidal Datum Epoch—The specific 19-year period adopted by the National Ocean Service as the official time segment over which tide observations are taken and reduced to obtain mean values (e.g., mean lower low water, etc.) for tidal datums. It is necessary for
standardization because of periodic and apparent secular trends in sea level. The present National Tidal Datum Epoch is 1960 through 1978. It is reviewed annually for possible revision and must be actively considered for revision every 25 years
• Jul 3, 2008, 02:16 AM
beaner
always can count on you pulling the references out lump.
• Jul 3, 2008, 03:36 AM
Lumpy
Quote:

Originally Posted by beaner
always can count on you pulling the references out lump.