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Why does the wind shutoff like a switch?
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sharkasm



Joined: 10 Apr 2000
Posts: 149

PostPosted: Thu Jul 19, 2007 3:17 pm    Post subject: Why does the wind shutoff like a switch? Reply with quote

Smile

Last edited by sharkasm on Sat Dec 26, 2015 3:28 pm; edited 3 times in total
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jp5



Joined: 19 May 1998
Posts: 3394
Location: OnUr6

PostPosted: Thu Jul 19, 2007 3:33 pm    Post subject: Reply with quote

It seems to coinside with the exact time that DABUL sets foot in the water. Laughing
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jp5



Joined: 19 May 1998
Posts: 3394
Location: OnUr6

PostPosted: Thu Jul 19, 2007 3:35 pm    Post subject: Reply with quote

It seems to coinside with the exact time that DABUL sets foot in the water. Laughing
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isobars



Joined: 12 Dec 1999
Posts: 20935

PostPosted: Thu Jul 19, 2007 4:47 pm    Post subject: Reply with quote

Mixing.

You've got strong wind above, but it only intermittently mixes down to the surface. How steadily it mixes down depends on atmospheric stability; high stability promotes steadier mixing, especially during the heat of the day. Low stability mixing is subject to every passing cloud and invisible thermal bubbles, creating more gustiness. Any practical weather book, especially one about sailing weather or wind in particular, will have whole chapters on this topic. Mixing can be nonexistent or incredibly inconsistent when a lake is colder than the air by 20 degrees F or more; we've often sat at a lake with wind measured at 30-40 kts just hundreds or maybe even scores of feet overhead while we had zero breeze or even opposing 10 mph beneath the scudding clouds.

\m/
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sharkasm



Joined: 10 Apr 2000
Posts: 149

PostPosted: Thu Jul 19, 2007 4:52 pm    Post subject: Reply with quote

.

Last edited by sharkasm on Sat Feb 07, 2009 9:11 pm; edited 1 time in total
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jp5



Joined: 19 May 1998
Posts: 3394
Location: OnUr6

PostPosted: Thu Jul 19, 2007 5:00 pm    Post subject: Reply with quote

Perhaps we all need to get out of the water when we see him rigging up. Shocked
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swchandler



Joined: 08 Nov 1993
Posts: 10588

PostPosted: Thu Jul 19, 2007 7:35 pm    Post subject: Reply with quote

It's really quite simple, as the wind went downslope (NW) in the very late afternoon along the south facing coast below Point Conception. In doing so, it cuts off the flow to areas much further south.

Because of these conditions, I sailed really powered at El Capitan State Beach til sunset. Very strong 5.6 conditions. It's been my secret spot for many years. I've tried to explain the setup to many locally in Santa Barbara over the years, but they lack the focus and a greater sense vision to take advantage of the possible opportunties that can present themselves quite suddenly late in the day. I guess the lack of wind reporting station leaves most in the dark about what really happens.
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dabull1



Joined: 19 Mar 1997
Posts: 556

PostPosted: Fri Jul 20, 2007 2:32 am    Post subject: Reply with quote

Yeah guys, take up that collection and just send me to Maui!!! However I did set a new world distance record for body dragging a couple of weeks ago at lower Kanaha after a turtle borrowed my fin about a mile and a half from shore. A session just isn't a session for a diehard Leo guy without dragging or swimming it in! Bull
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blond_wind



Joined: 20 Jul 2007
Posts: 18

PostPosted: Fri Jul 20, 2007 7:29 am    Post subject: Luckly Reply with quote

Uaaaaau.You are very lucky. You live near a windsurf spot with 30 wind nods. I live in north of Italy in Europe and there are in Italy only two windsurf spot with strong win. There are Sardinia an island and Garda Lake. I live in north of Italy Milan. I work there. I haven't the sea only in the week end it will be possible have a windsurf session...and in this last week end the wind wasn't enough. I am thinking to move in other continent with wind all the year.
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jp5



Joined: 19 May 1998
Posts: 3394
Location: OnUr6

PostPosted: Fri Jul 20, 2007 9:23 am    Post subject: Reply with quote

Well then come on out to California, I think Bull is single.
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