[CT Birds] Radar this morning

Scott Kruitbosch kbosch at gmail.com
Sun Aug 29 08:19:36 EDT 2010

Since we obviously cannot see attachments on the list I have no idea, but I
would check which mode the radar was in, as the different modes can make it
look heavier or lighter (clear weather or stormy etc.) And you may very well
be seeing some birds readjusting or early movers taking off. I should have
posted this yesterday but since we are still on the eastern side of this
massive ridge we are going to continue to have downslope N/NW winds. That is
why decent nocturnal migration occurred again. They will probably tonight,
and tomorrow night. It won't be as good as the first two nights (Fri/Sat),
but it'll be decent. The high will move by us eventually and shift
everything to the S flow. For now, during the day, it will be a battle
(especially right here in CT) of sea breeze and mixing warm temperatures
aloft with that N/NW boundary layer flow. So this means we may start off
some diurnal migration pretty well, but the raptors and others may stop
moving in the middle of the day, or not find it conducive enough. Hopefully
it will be enough of a wind battle to keep the White-tailed Kite, too. Gate
will be open shortly and again this evening as usual.


On Sun, Aug 29, 2010 at 7:52 AM, David Provencher <
davidprovencher at sbcglobal.net> wrote:

> Roy,
> I'm sending this reply to everyone because I have been asked about morning
> flight and Bluff Point a lot in the last few days and I'm going to put a
> basic primer about that on CTBirds later today (getting ready to go
> kayaking
> at the moment). This reply may be of some interest to everyone as well.
> Well the weather forecast on winds that I used yesterday proved incorrect
> and winds were good for a flight last night. My take on the radar images
> you
> ask about is it's morning flight. As you know, morning flight is a brief
> diurnal continuation of movement in the direction of the intended migration
> by nocturnal migrants. This daylight movement apparently doesn't happen as
> a
> seamless continuation of migration. There is a period when the nocturnal
> flyers put down and briefly rest. The first radar image from 05:47 matches
> with the pre-morning flight movement timing we see at Bluff Point, but only
> just. The morning flight there would be starting in mere minutes after
> that.
> The second image would be the height of the movement timing. So my guess is
> the radar images are indeed partly birds, if not mostly birds. I need to do
> some research (one more thing with no free time now!) on the echo
> reflection
> versus migrant numbers to better understand the image intensities, those
> intensities seem a bit strong for the likely amount of movement last night.
> More later...
> Dave Provencher
> Naturally New England
> http://naturallynewengland.blogspot.com/
> -----Original Message-----
> From: Roy Harvey [mailto:rmharvey at snet.net]
> Sent: Sunday, August 29, 2010 7:05 AM
> To: Nick Bonomo; Greg Hanisek; Greg Hanisek; David Provencher; David
> Provencher; Glenn Williams; Mark Szantyr; Mark Szantyr
> Subject: Radar this morning
> I just saw something I do not understand on the radar from this morning.
> Two images are attached, about an hour apart.  The first shows essentially
> nothing and was from around 5:47 EDT.  The second from around 6:40 shows
> very heavy activity.  A lot of it is along the coast (eastern CT in
> particular, so I included Glenn and Dave) and off the coast (south shore
> LI), but there are other areas.  I can't see how it could be anything but
> birds, but I can't figure out what birds?  Shorebirds is one obvious idea,
> but that seems like an amazing number of shorebirds.  Terns/gulls might
> merit consideration too.  Or a combination?  An explanation probably needs
> to include what is happening over upstate and southern NY and in NJ too.
> Good birding!
> Roy
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Scott Kruitbosch
Stratford, CT
Connecticut Audubon Society

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