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More Turbulence Over Mountains?  
User currently offlineAMS From United States of America, joined Aug 2003, 1689 posts, RR: 11
Posted (10 years 8 months 5 days 13 hours ago) and read 5357 times:

When flying over a mountain area, I noticed that many times there is more turbulence......especially over Austria, switzerland and also Japan

can high mountains create this turbulence?

12 replies: All unread, jump to last
 
User currently offlineVimanav From India, joined Jul 2003, 1514 posts, RR: 15
Reply 1, posted (10 years 8 months 5 days 12 hours ago) and read 5294 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.

Rgds//Vimanav




Sarfaroshi kii tamannaa ab hamaare dil mein hai, Dekhnaa hai zor kitnaa baazu-e-qaatil mein hai
User currently offlineKay From France, joined Mar 2002, 1884 posts, RR: 3
Reply 2, posted (10 years 8 months 5 days 12 hours ago) and read 5264 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.


User currently offlineAaron747 From Japan, joined Aug 2003, 7951 posts, RR: 26
Reply 3, posted (10 years 8 months 5 days 8 hours ago) and read 5180 times:

Mountains and turbulence are rule one of flight training AMS. Only if you get really lucky and have a calm day will you not experience some bumps when crossing terrain.


If you need someone to blame / throw a rock in the air / you'll hit someone guilty
User currently offlineOPNLguy From , joined Dec 1969, posts, RR:
Reply 4, posted (10 years 8 months 5 days 5 hours ago) and read 5071 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.


User currently offlineMarcos From United States of America, joined Jun 2001, 68 posts, RR: 0
Reply 5, posted (10 years 8 months 5 days 4 hours ago) and read 5048 times:

I remember quite vividly flying an AeroPeru DC-8 from Buenos Aires to Santiago over the Andes. Just about tossed my cookies. Most turbulence experienced by me in 30 years of being a passenger.

User currently offlineAMS From United States of America, joined Aug 2003, 1689 posts, RR: 11
Reply 6, posted (10 years 8 months 5 days 4 hours ago) and read 4999 times:

I see! it seems mountain area's do have some turbulence!

User currently offlineMD80Nut From United States of America, joined Jul 2003, 889 posts, RR: 9
Reply 7, posted (10 years 8 months 5 days 3 hours ago) and read 4973 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.


Fly Douglas Jets DC-8 / DC-9 / DC-10 / MD80 / MD11 / MD90 / 717
User currently offlineTheNoFlyZone From Canada, joined Jan 2001, 2252 posts, RR: 12
Reply 8, posted (10 years 8 months 5 days 3 hours ago) and read 4947 times:

Anyone know what time of the day do turbulence's occur the most?
I heard that early morning flights just before or during sunrise is the worst time to fly because of the turbulences?..Is this true?

TheNoFlyZone



us Air Traffic Controllers have a good record, we haven't left one up there yet !!
User currently offlineStar_world From Ireland, joined Jun 2001, 1234 posts, RR: 0
Reply 9, posted (10 years 8 months 5 days 3 hours ago) and read 4940 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.

star_world


User currently offlinePositive rate From Australia, joined Sep 2001, 2143 posts, RR: 1
Reply 10, posted (10 years 8 months 5 days 1 hour ago) and read 4906 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.

User currently offlineC172Akula From Canada, joined Mar 2001, 996 posts, RR: 4
Reply 11, posted (10 years 8 months 5 days ago) and read 4892 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.

User currently offlineTheNoFlyZone From Canada, joined Jan 2001, 2252 posts, RR: 12
Reply 12, posted (10 years 8 months 4 days 23 hours ago) and read 4840 times:

yeah!...hehe...Cumulo-Granite is bad!...really bad!..hehe


us Air Traffic Controllers have a good record, we haven't left one up there yet !!
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