Addendum: If anyone would like help figuring out the lunitidal hours where they are just drop me a line, my contact information is available, people shouldn’t have to pay for this information.

-Meh.

Well, it’s been a long time since I have posted anything here as I have been busy. I have taken up a new hobby, scuba diving. I am currently working my way through the cert class right now, but I can tell you that it’s going to be fun. If anyone actually reads this thing and would like to know a good diving school check out http://www.sduadivers.com/ they are freakin awesome. Chip, Liz and Nate (who teaches occasionally) are all awesome, and they really know their stuff. Oh and I got a snazzy new watch that tells the moon phase and tide phase and thought that I would post the formula and answer to the San Diego Lunitidal hours interval:

The formula as you will find on the noaa website is (http://tidesandcurrents.noaa.gov/faq2.html#22)

Local Interval = GI – (0.069 * L)

• Where L is the longitude for the location in degrees. West longitudes are positive; East longitudes are negative.
  Example: 122 degrees 23.7 minutes West would be 122.395 degrees. (23.7 / 60 = 0.395)
• Longitude for a station is available from the Accepted Datums page by using the link provided for further station information.
• Where GI is the Greenwich Interval. To calculate the High Tide Local Interval, use the Greenwich Mean High Water Interval in Hours from the Accepted Datums page. To calculate the Low Tide Local Interval, use the Greenwich Mean Low Water Interval in Hours.
• Some products will require the Local Interval to be a positive number. You can convert a negative interval to a positive by adding 12.42 to the result.
  For example, if your interval calculated to be -4.11; you could also use 8.31 (-4.11 + 12.42 = 8.31)

While this looks all dandy and shit, here is how to get the answer (for La Jolla which is closest to me, and where I will be diving)
La Jolla HWI
Check the HWI (Greenwich High Water Interval) which for La Jolla is 5.01 so the formula looks like

L: -117.257 (close enough)
0.069 * -117.257 = 8.09
5.01 – 8.09 = -3.08
-3.08 + 12.42 = 9:34 (Local Time Interval for La Jolla).

Random Musings Lunitidal, Lunitidal Hours, Lunitidal Interval