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dlm34077(at)gmail.com
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PostPosted: Tue Sep 12, 2017 4:57 am    Post subject: RTW Reply with quote

The geographic science "guarantees" a tailwind after the aircraft crosses south of 30N; airlines and others use this. Very rarely the tailwinds don't materialize strong enough and an aircraft ditches short of Hawaii.

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glastar(at)gmx.net
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PostPosted: Tue Sep 12, 2017 5:11 am    Post subject: RTW Reply with quote

Eastbound or westbound?

On 12.09.2017 14:55, dlm wrote:
Quote:
The geographic science "guarantees" a tailwind after the aircraft
crosses south of 30N; airlines and others use this. Very rarely the
tailwinds don't materialize strong enough and an aircraft ditches short
of Hawaii.


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dlm34077(at)gmail.com
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PostPosted: Wed Sep 13, 2017 12:02 am    Post subject: RTW Reply with quote

CA to HI starts with headwind usually north of 30N and route goes south of 30N about mid trip. Some single engine ferry flights to HI  and beyond have ditched short of HI when the tailwind did not meet expectations. ERAU Prescott AZ had a seminar one evening of a ferry flight for a Cirrus to Sydney. The Cirrus took off from KSFO about 2000 over gross; crossed 30N and made it to HI and beyond.
Took a physical geography course at a local college in 2015 and the global air circulation patterns indicate in the Northern hemisphere that between 30N and 60N the prevailing winds at all altitudes below about FL400 are from the west and that the prevailing winds from the equator to 30N are from the East.


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rj_todd(at)yahoo.co.uk
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PostPosted: Wed Sep 13, 2017 12:42 am    Post subject: RTW Reply with quote

Thanks very much for that Dave; I certainly wasn't aware of the low level reversal.

On Wednesday, 13 September 2017, 16:12, dlm <dlm34077(at)gmail.com> wrote:



CA to HI starts with headwind usually north of 30N and route goes south of 30N about mid trip. Some single engine ferry flights to HI and beyond have ditched short of HI when the tailwind did not meet expectations. ERAU Prescott AZ had a seminar one evening of a ferry flight for a Cirrus to Sydney. The Cirrus took off from KSFO about 2000 over gross; crossed 30N and made it to HI and beyond.
Took a physical geography course at a local college in 2015 and the global air circulation patterns indicate in the Northern hemisphere that between 30N and 60N the prevailing winds at all altitudes below about FL400 are from the west and that the prevailing winds from the equator to 30N are from the East.


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Mauledriver(at)nc.rr.com
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PostPosted: Thu Sep 14, 2017 7:33 am    Post subject: RTW Reply with quote

Not so much a reversal if you think up from the surface where what has traditionally been known as the trade winds follow this pattern worldwide - east and west, north and south. 

Above the 30s north and south the winds tend to be westerly, towards the equator they tend to go east.  The westerlies are king, the eastern winds princes and no dominant winds go north or south.  The think that is some version of sailing stuff but I don't sail.  Above 40,000 might as well be space in our craft.

Bill "I like reading about sailing ship stuff" Watson

On 9/13/2017 4:28 AM, Rodger Todd wrote:

Quote:
Thanks very much for that Dave; I certainly wasn't aware of the low level reversal.



On Wednesday, 13 September 2017, 16:12, dlm <dlm34077(at)gmail.com> (dlm34077(at)gmail.com) wrote:



CA to HI starts with headwind usually north of 30N and route goes south of 30N about mid trip. Some single engine ferry flights to HI  and beyond have ditched short of HI when the tailwind did not meet expectations. ERAU Prescott AZ had a seminar one evening of a ferry flight for a Cirrus to Sydney. The Cirrus took off from KSFO about 2000 over gross; crossed 30N and made it to HI and beyond.
Took a physical geography course at a local college in 2015 and the global air circulation patterns indicate in the Northern hemisphere that between 30N and 60N the prevailing winds at all altitudes below about FL400 are from the west and that the prevailing winds from the equator to 30N are from the East.











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PostPosted: Thu Sep 14, 2017 9:02 am    Post subject: RTW Reply with quote

check https://www.metoffice.gov.uk/learning/learn-about-the-weather/how-weather-works/global-circulation-patterns
The web site addresses the air circulation patterns of the Hadley cell, Ferrel cell and Polar cell 


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