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Post by el Gusano on Jun 19, 2007 5:03:38 GMT -5
Anyone know if this is possible or not? It's claimed by several old timers that when we got our record cold temperature, which is -24, it stayed at -20 for nearly a month. (This is easy to check out, and the bay froze all the way across, which was probably interesting with our 30 ft tides...)
But, they also claimed that the high pressure area that caused it and kept it here was so high that altimeters would not work, so they had to close the airport. Is this possible?
BTW, I wanted to say that birding photographers are nuts. (This is for Bob.) Oh, wait, we're not supposed to call psychos "nuts", are we?
Anyway, it's generally a bad idea, when you see something special like a white tufted-butt gannet to stop your car in the middle of the highway, hopping out with your camera, to take a photo in the road. Especially with 16.5 tons of yellow metal hammering down on you.
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Post by Justin Thyme on Jun 19, 2007 5:19:58 GMT -5
Altimeters have adjustments for barometric pressure and a pilot is suppose to get the local barometric pressure from the airport to adjust for operations in the area. The high pressure would have maybe had the airport looking like it was maybe a couple of hundred feet lower than what it actually was but the barometric pressure would have had to have been greater than the adjustability of the altimeters for the airport to have to close.
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Deleted
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Post by Deleted on Jun 19, 2007 6:44:31 GMT -5
> so high that altimeters would not work...
I don't believe it.
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Post by el Gusano on Jun 19, 2007 13:04:07 GMT -5
> so high that altimeters would not work... I don't believe it. Neither did I, but I didn't know. That's why I asked.
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Post by Count No Account on Jun 21, 2007 11:25:13 GMT -5
From the FAA Aeronautical Information Manual, Chapter 7, Section 2:
2. When the barometric pressure exceeds 31.00 inches Hg. The following procedures will be placed in effect by NOTAM defining the geographic area affected:
(a) For all aircraft. Set 31.00 inches for en route operations below 18,000 feet MSL. Maintain this setting until beyond the affected area or until reaching final approach segment. At the beginning of the final approach segment, the current altimeter setting will be set, if possible. If not possible, 31.00 inches will remain set throughout the approach. Aircraft on departure or missed approach will set 31.00 inches prior to reaching any mandatory/crossing altitude or 1,500 feet AGL, whichever is lower. (Air traffic control will issue actual altimeter settings and advise pilots to set 31.00 inches in their altimeters for en route operations below 18,000 feet MSL in affected areas.)
The little box that where you set the pressure on an altimeter is the Kollsman window, btw.
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