Date: 7/10/19 8:09 am From: Bob Archer <rabican1...> Subject: [obol] Re: shorebird question
No real knowledge to provide except I suspect it is a correlation that has no causation. The north winds are caused by the spring time movement north of the eastern pacific high combined with the warming of the SW United States causing a pressure gradient. Added to this is the cold coastal water brought to the surface causing an additional temperature gradient. So the wind blows harder in afternoon than morning. If you want to experience north winds, try to sail north past Point Piedras Blancas in the spring.
So maybe the warming weather chases the birds north but causes the winds as well.
Bob Archer PDX
On Wed, Jul 10, 2019 at 7:37 AM <t4c1x...> wrote:
> > Does anybody know why the heaviest movement of migrating shorebirds in > spring seems to coincide with a strong headwind from the north? > Darrel >