Vimanav From India, joined Jul 2003, 1538 posts, RR: 14
Reply 1, posted (12 years 8 months 2 weeks 6 days 13 hours ago) and read 6799 times:
When the land is flat, the wind blowing over the land has no obstructions. However in a mountainous area, the wind strikes the sides of the mountain and tends to be highly disturbed causing updrafts and downdrafts. When the aircraft passes through these updrafts and downdrafts one experiences turbulence.
Hope this clarifies.
Sarfaroshi kii tamannaa ab hamaare dil mein hai, Dekhnaa hai zor kitnaa baazu-e-qaatil mein hai
Kay From France, joined Mar 2002, 1887 posts, RR: 3
Reply 2, posted (12 years 8 months 2 weeks 6 days 12 hours ago) and read 6769 times:
Wave turbulence is a kind of turbulence associated with mountains. The wind goes up and down in a "wave" for a while even though the mountain peak it bumped into is (reasonably) far behind.
In my humble experience in Cessna's, turbulence near mountains is unbearable. I don't remember once being close to the surface of a mountain and the plane not bouncing around like crazy. I once passed a mountain peak and the plane was literally falling even though at full power, because of downdraft. I know the terrain, there is more than enough space to "pull out", but still, it scares passengers.
OPNLguy From , joined Dec 1969, posts, RR:
Reply 4, posted (12 years 8 months 2 weeks 6 days 6 hours ago) and read 6576 times:
>>>can high mountains create this turbulence?
As the others have mentioned, absolutely yes....
Keeping in mind that air behaves as a fluid, it might help you to visualize (or look at outright) a small stream or brook in your area. After flowing over some rocks or other items raised above the stream bed, you can easily see various disturbances in the water down stream of where the rocks/items are. The air flowing over the mountains can create some similar effects on the lee side of(i.e., downstream from) the mountains.
MD80Nut From United States of America, joined Jul 2003, 1058 posts, RR: 8
Reply 7, posted (12 years 8 months 2 weeks 6 days 4 hours ago) and read 6478 times:
I've flown over the Andes mountains on several ocassions and all flights experienced some degree of turbulence. As others have explained, the air above the mountains is reacting to the terrain, and the Andes being pretty high, they can affect aircraft flying far above them or even in the general area.
Star_world From Ireland, joined Jun 2001, 1234 posts, RR: 0
Reply 9, posted (12 years 8 months 2 weeks 6 days 4 hours ago) and read 6445 times:
I'd heard the opposite, that the turbulence becomes more severe in the afternoon when the ground has been heated for most of the day by the sun, creating more thermals and therefore more disturbed air.
Positive rate From Australia, joined Sep 2001, 2143 posts, RR: 1
Reply 10, posted (12 years 8 months 2 weeks 6 days 1 hour ago) and read 6411 times:
Definitely afternoon. Early morning is supposed to be the calmest part of the day for flying- especially in summer. By afternoon the ground has heated up and someone already mentioned thermals are created andmore turbulence results.
C172Akula From Canada, joined Mar 2001, 1017 posts, RR: 3
Reply 11, posted (12 years 8 months 2 weeks 6 days 1 hour ago) and read 6397 times:
I do my mountain flying in the morning here at YYC. By the afternoon you can get some wicked turbulence. And when we have the chinook wind coming out of the west, forget flying into the mountains unless you want to experience some Cumulus Granitis.