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Old 17-11-2015, 11:18   #46
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Re: Tragedy in San Francisco

A friend says the spot where that wave is breaking is actually about 35-40' of water along the Bonita Channel, which loses its "channel" in these conditions. The Potato Patch is a shallower area west of there and should be avoided pretty much always.

Here's good info on the bar right outside the Golden Gate, and specifically, the Bonita Channel, where that trawler was: The San Francisco Bar | CoastsideFishingClub.com

Thanks for reminding me about this stuff. It's good to have the refresher whenever sailing in that area.
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Old 17-11-2015, 12:23   #47
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Re: Tragedy in San Francisco

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Originally Posted by r_p_ryan View Post
I realize this is a retired thread, but I shot some video from the lighthouse on the point right near the entrance to SF Bay. It shows a 15 - 20' sneaker wave form and break several hundred yards offshore. It also shows a cabin cruiser that had just traversed that area a couple minutes before.

It was a calm day, with light winds and a gentle swell. This wave came out of nowhere and would have capsized yachts of large proportion.

https://youtu.be/AZ9kru3KLDE
That video is a great heads-up to folks sailing in/out of the bay. Imagine a swell running, 25-30 knots and a strong ebb tide opposing it... not hard to see how a large set or single wave can develop. Thanks for that video.
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Old 17-11-2015, 17:11   #48
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Re: Tragedy in San Francisco

Quote:
Originally Posted by gamayun View Post
A friend says the spot where that wave is breaking is actually about 35-40' of water along the Bonita Channel, which loses its "channel" in these conditions. The Potato Patch is a shallower area west of there and should be avoided pretty much always.

Here's good info on the bar right outside the Golden Gate, and specifically, the Bonita Channel, where that trawler was: The San Francisco Bar | CoastsideFishingClub.com

Thanks for reminding me about this stuff. It's good to have the refresher whenever sailing in that area.
I believe that we are indeed seeing the Potato Patch, or at least Four Fathom Bank. Notice the buoy in the video -- that looks like buoy"RG" WSW from the Pt Bonita light. See the chart in your linked article:


The Bonita channel hugs the shore north of the point.

For what it's worth, I think more boats have been lost in the "south channel", which is a channel in name only.
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