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Old 20 September 2001, 07:49   #11
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Great link Allan I will be saving this one.


Regards Gary
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Old 20 September 2001, 10:27   #12
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What? Moderate, waves!!! 5 foot

I had the vision of small waves lapping gently at the side of my boat whilst I gently cruised between the islands gazing at seals and dolphins for MODERATE.... Mind you PHENOMENAL sounds fun!!

Well, it just goes to prove how useful and educational this forum is to us new commers. Thanks for all the info, just what I needed.

Cheers

Keith Hart
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Old 20 September 2001, 16:37   #13
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When looking at wave height a very important factor is the wave interval. You might find that 10 foot waves with a long wave interval just gives you a big rolling sea which you can just go up and down at quite some speed. almost like a big dipper effect
On the otherhand a 3 foot wave with a very short interval may give you quite a pounding.
At open sea the wave intervals tend to be much longer getting much shorther as you come inland or shallow water.
I have often been out with a six foot wave height not far of Milford Haven and while seeing the waves above you may be a but unnerving as they do not break the only real risk if seeing your last meal again.





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Old 20 September 2001, 18:03   #14
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Hi ,

The following which can be found in the RYA Powerboat Course notes manual ( standard issue to all ISA / RYA Level 2 students is :

1- Light air ripples
2 - Light breeze small ripples
3 - Gentle breeze - somebreaking wave crests
4 - Moderate breeze fairly frequent white horses
5 - Fresh breeze many white horses some spray
6 - Strong breeze extensive white horses and spray
7 - Near gale very rough foam streaking down wind from wave crests
8 - Gale
9 - 12 Stay at home !

I also have another more detailed version in another book which I read recently ( but damned if I can remember where ! ) which in addition makes reference to the amount of canvas a smack can carry in the various wind strenghts !

Best wishes ,

Stuart
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Old 21 September 2001, 05:23   #15
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I've had a reply from the Met Office customer support department who say they don't know but will find out!

Watch this space for the definitive (!) versions of smooth, moderate and rough . . .

John
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Old 21 September 2001, 09:33   #16
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!!!

No matter smooth or moderate, I always feel rough in the morning...
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Old 21 September 2001, 13:00   #17
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Just to throw in what the admiralty say:


Code Description Height (metres)
0 Calm-Glassy 0
1 Calm-Rippled 0 - 0.1
2 Smooth wavelets(?) 0.1 - 0.5
3 Slight 0.5 - 1.25
4 Moderate 1.25 - 2.5
5 Rough 2.5 - 4
6 Very Rough 4 - 6
7 High 6 - 9
8 Very High 9 - 14
9 Phenomenal 14+
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Old 21 September 2001, 14:54   #18
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Waves

I think that we all sail with force 0 to 5 (max). If by any bad chance get caught in sea with force 6 or more, I am sure that none of us will really cares what the waves height was.
Does anybody cary a measuring tape on board ?
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