[CT Birds] Bluff Point expectations for Monday Tuesday
mantlik at sbcglobal.net
Sun Sep 9 10:53:10 EDT 2012
Thanks for sharing your years of morning-flight experience with the rest of us. Now if we could only learn to ID all the warblers in flight! And to photograph them in flight as half as well as Tom Johnson does at Cape May.
Sent from my iPhone
On Sep 9, 2012, at 10:40 AM, "David Provencher" <davidprovencher at sbcglobal.net> wrote:
> I still expect Monday and Tuesday to be good days at Bluff Point in Groton.
> I expect Tuesday to offer better views of the birds undergoing morning
> flight however. Briefly here is why:
> I have learned from years of experience that breezy mornings cause the birds
> to leave the trees of the reserve earlier, which often results in many birds
> flying very high over the area birders use to observe the event.
> Additionally, the trees are moving in the breeze which makes finding those
> birds moving through the vegetation more difficult to find and see well.
> These can be frustrating days, when thousands of birds pass overhead with
> just a small number being seen decently (or at all). My theory for why birds
> head higher sooner on breezy days is that birds prefer to fly in stable air
> (flight efficiency, energy usage, etc.), and the most unstable air on a
> breezy day is going to be at the interface of the forest canopy with the
> moving air, where the breeze tumbles and swirls as it interacts with the
> trees and other obstacles (like waves breaking on a beach). So I believe the
> birds rise up quickly on these breezy mornings to get out of this turbulent
> air into the steadier flow above.
> Monday's forecast is for a breezier day than Tuesday, and it is most
> definitely my experience that the second clear night after a strong Fall
> cold front is far more stable than the first night (has to do with high and
> low atmospheric differential pressure, blah blah blah). So I have often
> experienced a better morning of birding at Bluff on the second morning after
> the front, even though more birds often move on the first night. So my
> expectations is for a good push of migrants tonight and a good (but smaller)
> push tomorrow night. My bottom line guess is this; more birds Monday
> morning, better views Tuesday morning. Fingers crossed.
> Dave Provencher
> Naturally New England
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