# Winter Great Circle Routes

**URL:** <https://forum.gcaptain.com/t/winter-great-circle-routes/2940>\
**Category:** Marine Weather\
**Created:** [December 11, 2009, 5:45am UTC](https://forum.gcaptain.com/t/winter-great-circle-routes/2940 "2009-12-11T05:45:30Z")\
**Posts on this page:** 3\
**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:** [December 11, 2009, 5:45am UTC](https://forum.gcaptain.com/t/winter-great-circle-routes/2940/1 "2009-12-11T05:45:30Z")

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Winter Great Circle Routes  
Westbound great circle routes sometimes present themselves during the midwinter. One example of this is developing over the North Atlantic during the next several days allowing shipping to minimize transit times. This opportunity is being caused by the prevailing jet stream deflecting stormtracks and the heaviest westerly winds and seas farther south than normal.

[Forecast 500mb](http://www.opc.ncep.noaa.gov/shtml/A_96hr500bw.gif)

[Forecast Winds/Seas](http://www.opc.ncep.noaa.gov/shtml/A_96hrwind_wave.gif)

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<div class="post-metadata">

**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:** [December 13, 2009, 10:07pm UTC](https://forum.gcaptain.com/t/winter-great-circle-routes/2940/2 "2009-12-13T22:07:32Z")

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Great Circle routes appear to in also across the North Pacific as the upper level jet stream has dropped there as well.

[500 Mb Forecast](http://www.opc.ncep.noaa.gov/shtml/P_48hr500bw.gif)

[Surface Forecast](http://www.opc.ncep.noaa.gov/shtml/P_48hrbw.gif)

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<div class="post-metadata">

**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:** [December 21, 2009, 2:22am UTC](https://forum.gcaptain.com/t/winter-great-circle-routes/2940/3 "2009-12-21T02:22:03Z")

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The upper level jet stream that has been displaced southward over the North Atlantic during the past 2 weeks and driven stormtracks farther southward than normal appears will start to break-up towards the end of this week.

[Upper Level Jet](http://www.nco.ncep.noaa.gov/pmb/nwprod/analysis/carib/gfs/00/index_250_su_loop.shtml)