# Upper-Level Blocking to Allow Greatcircle Routes

**URL:** <https://forum.gcaptain.com/t/upper-level-blocking-to-allow-greatcircle-routes/4948>\
**Category:** Marine Weather\
**Created:** [November 23, 2010, 10:01am UTC](https://forum.gcaptain.com/t/upper-level-blocking-to-allow-greatcircle-routes/4948 "2010-11-23T10:01:06Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![fredwx](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.gcaptain.com/fredwx/32/3873_2.png) [@fredwx](https://forum.gcaptain.com/u/fredwx)\
**Post date:** [November 23, 2010, 10:01am UTC](https://forum.gcaptain.com/t/upper-level-blocking-to-allow-greatcircle-routes/4948/1 "2010-11-23T10:01:06Z")

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A developing blocking upper-level ridge forecast over the north-central North Atlantic during the next several days will likely force Atlantic stormtracks southward allowing for more northerly great circle routes for westbound transits from North Europe and even the Mediterranean.

[See Maps](http://oceanweatherservices.com/blog/2010/11/23/upper-air-blocking-will-allow-for-greatcircle-routes/)

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**Author:** ![fredwx](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.gcaptain.com/fredwx/32/3873_2.png) [@fredwx](https://forum.gcaptain.com/u/fredwx)\
**Post date:** [November 25, 2010, 7:53am UTC](https://forum.gcaptain.com/t/upper-level-blocking-to-allow-greatcircle-routes/4948/2 "2010-11-25T07:53:29Z")

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Surface 1060MB high over Greenland Nov 25th 00Z

![](http://oceanweatherservices.com/blog/wp-content/uploads/2010/11/1060High.jpg)