Tide watch

[tightline]

Does anyone out there own a watch that shows tides? I just got one, and in order for it to show the correct tidal movements, I have to input the lunitidal interval. I've been searching the net for 2 days now, and have come up with nothing. I've even called the NOAA, U.S. Army Corps of Engineers, Coast Guard, etc. and nobody was able to help.

I need the info. for the Galveston, TX area. NOAA does list the Greenwich Mean High & Low Water Intervals for some areas along the east coast, but none for Texas. If I had the Greenwich information, I could use an equation I found to come up with the Lunitidal Interval.

[Bob Parsons]

I have a Rip Curl tide watch. All I had to do was enter the date of a recent tide.

[RogerStg]

I've been searching the net for 2 days now, and have come up with nothing. I

http://www.fuzeqna.com/noaa.answers/consumer/kbdetail.asp?kbid=485

2 minutes with Google. ;)

[tightline]

http://www.fuzeqna.com/noaa.answers/consumer/kbdetail.asp?kbid=485

2 minutes with Google. ;)

I already came across that one.
"NOAA does list the Greenwich Mean High & Low Water Intervals for some areas along the east coast, but none for Texas. If I had the Greenwich information, I could use an equation I found to come up with the Lunitidal Interval."

They don't list the Greenwich info. for any places in Texas, so I can't work out the equation to get the lunitidal interval. Thanks for trying, though.

[Bob Parsons]

?
Would knowing the tides in the general area be helpful?

Is so try hereTides (http://tbone.biol.sc.edu/tide/sites_usgulf.html)
Scroll to the bottom of the list to get to Texa sites.

[tightline]

The tide changes that the watch shows are based solely on the lunitidal interval you input. As a last resort, I'll do the trial and error thing where I input randon lunitidal intervals and compare them to the tide chart for that day. If it doesn't match up, I'll input a different lunitidal interval and start over again.

[Bob Parsons]

Ok how about looking at a tidechart of an area where you can find the lunitidal interval and see how they compare and then try estimate it based on your local tide charts kinda like one of those old math problems , a/b=c where a represents tide interval and represents.. . oh heck you get the picture.

[bones]

What is the info you need? I have a computer disc with all the tide info from Nova Scotia down thru Central America, the Caribbean and the whole Wast coast From Barrow S. America spanning 200 years!!

May be I can help.

Give me a holler.

[bones]

Google lunitidal interval then click Co-ops frequently asked questions, scroll down to the instruction of how to program your watch. Let us know how it works?

[JimC]

This might hurt a few heads but here goes:

I think what the question the watch manufacturer is getting at is are your tides:
Semi diurnal (like the East coast US with two highs and two lows of nearly the same magnitude each day)? If so the lunitidal period is 12 hours and 24 minutes (12.42 hrs)
If you have diurnal (one high and one low each day) then the period as determined by the diurnal lunar constant is 24 hours and 49 minutes (24.82 hrs).

Most of the Gulf of Mexico has diurnal tides although a section of east Texas has mixed semi-diurnal tides (two high and two low each day but you'll see that the two highs are much different (basically a high-high and a low-high) and the two lows are a "higher low" and a "lower low". Check a tide table for the area you fish to confirm your area's overall tide pattern. I'd use the semi-diurnal period if your's is a mixed tide and check the watch against a tide table and what you might observe on the water.

[bones]

Correct-amundo, JimC.........Galveston tides are diurnal

[tightline]

Bones...I found the Co-ops site you meantioned a couple of days ago. They don't list the Greenwich Mean High Water Interval (in hours) for any spots in Texas. I need that number to calculate the lunitidal interval.

JimC...since the lunitidal interval is based off of longitude and the Greenwich Mean High Water Interval, I don't think your recommendation will work. The user manual that came with the watch lists about 15 cities and their lunitidal interval, and those numbers are all completely different, ranging from 0.5 to 15 I think, depending on what city your in.

I was able to find a "Tide Guru" in Port Aransas that thinks he can find the info. I need. I'm still waiting to hear back from him.

[JimC]

Who is the manufacturer of the watch? I'd be interested to dig into this a little deeper.

I think you are looking for a number in the range of 1.7 Check this link to the N Jetty for the entrance to Galveston Bay and click on the Diurnal period. (http://140.90.121.76/cgi-bin/station_info.cgi?stn=8771341+GALVESTON+BAY+ENTRANC E,+NORTH+JETTY+,+TX)

This .pdf file (http://data.labins.org/2003/SurveyData/WaterBoundary/MHW/documents/9tidepredictions.pdf) might be helpful in terms of utilizing the CO-OPS site/data.

[tightline]

It's a Casio watch...Sea Pathfinder.

[tightline]

You da man JimC. The pdf you posted had a phone # to OPSD. The gave me the Greenwich MHW and MLW intervals for galveston. Now I can finally run my calculations.

Thanks.

[mcdull]

You da man JimC. The pdf you posted had a phone # to OPSD. The gave me the Greenwich MHW and MLW intervals for galveston. Now I can finally run my calculations.

Thanks.

Hi, I am also looking for the Greenwich MHW interval for Galveston for my new Casio watch. Could you please post it here? I would greatly appreciate it.

Thank you very much! :)

[lutexas]

Would you please tell me the lunitidal interval for Galveston. I bought the same watch and I'm looking for that number to configure it.

Thanks,

Luis
lutexas@hotmail.com