Latitude 38 June 2008

Page 152

EYE ON THE BAY

Blow the man down — San Francisco's famous 'wind machine' makes the Bay one of the best sailing arenas on the planet.

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hat do you do if you're out sailing and get caught in fog? Take a bearing and keep sailing! As mentioned earlier, it can get a bit spooky, but the visibility rarely drops below 100 feet, and most of the time, all you have to do is sail north or south for awhile before you bust out of it into the world again. Just hope that horn that you hear is also a land or bridge-based foghorn rather than an oncoming tanker. Those encounters can be pretty scary. — latitude 38/jr

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• June, 2008

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Page 152 •

point' — and form fog, which is nothing more than clouds at sea level. (Local winter fog, such as obscured the Bay Bridge when the tanker hit it last winter, is caused by other factors.) The foggiest place in the world is the Grand Banks, where the cold Labrador current flows in from the north to meet the warm Gulf Stream. But the San Francisco-to-Point-Reyes area is among the top three foggiest land areas, with up to 60 'reportable' days of white stuff a year.

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the Slot, all the way to Berkeley. Wow! Is this the coolest place on earth to sail, or what? Believe it or not, there are 12 types of fog, each with specific characteristics and causes. Half of them are found commonly at sea or along coastlines. In the warmer months, San Fran-

cisco's famous mist is caused by a combination of 'advection' and 'inversion' fog. Both are byproducts of our famous summer 'wind machine': the torrid heat of the inland valley rises, forming a huge area of low pressure; the Pacific High is pressing down on an even larger area and, well, everybody knows how much nature abhors a vacuum. So the valley sucks, the High blows, and the result is spectacular sailing on the Bay all summer long. And sometimes spectacular fog, which forms if the incoming air is warm enough and the ocean it's passing over is cold enough. When that happens, the water particles in the air reach 'dew

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