Entering winter pattern, lower jet stream

[tb_neg]

We are starting to enter the fall/winter pattern, the jet stream is lower, and there is a greater chance for light to moderate at altitude.

http://squall.sfsu.edu/gif/jetstream_loop.gif



As we transition into a summer weather pattern, flights will be a lot smoother for the next few months until the winter pattern returns again.

[Anonymous]

great news!! Love the site thank youfor making all of us feel safe in the sky...when about does the winter pattern start?

[tb_neg]

It turns out that March was a bit premature to post that the summer pattern is here, but it's here now, as the jet stream is up in Canada most of the time. As for a time frame, I'd say May through October for the summer pattern.

Some links:

http://www.geography.hunter.cuny.edu/~tbw/wc.notes/7.circ.atm/westerly.components/seasonal_jet_changes.htm
http://www.classzone.com/books/earth_science/terc/content/investigations/es1906/es1906page02.cfm