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dlm34077(at)gmail.com
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Posted: Tue Sep 12, 2017 4:57 am Post subject: RTW

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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Posted: Tue Sep 12, 2017 5:11 am Post subject: RTW

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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Posted: Wed Sep 13, 2017 12:02 am Post subject: RTW

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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Posted: Wed Sep 13, 2017 12:42 am Post subject: RTW

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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Posted: Thu Sep 14, 2017 7:33 am Post subject: RTW

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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dlm34077(at)gmail.com
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Posted: Thu Sep 14, 2017 9:02 am Post subject: RTW

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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