Re: [boo] Re: Radar images of Barn Swallow fly-out across NW Oregon
Mary Garrard
On Sep 21, 2023, at 8:18 AM, Stephen T Bird <isseki....@gmail.com> wrote:For those rising late or already out birding and arriving at your email too late in the morning to have missed it, this is too cool to miss so I made a quick gif on my phone. Many thanks to David and Paul for this thing of wonder.A question to those that might be better in the know, looking at the several “bursting bubbles” near Buena Vista Ferry (south of Salem), it looks like the largest bubble radiates outward from about 10oclock to 4oclock. Then the other two to the East only radiate outward pointed away from that bigger flock. The bubble north of Salem also radiates outward pointed away from these flocks. It “makes sense” but we’d still ask the question, is it known to ornithology if these birds optimize the territory they cover so as to not compete with other flocks for food/territory?-Stephen<AC046D09-7CB9-4BC9-B34E-26F401CE9EF2.gif>On Thu, Sep 21, 2023 at 7:28 AM David Bailey <davidcbai...@gmail.com> wrote:Thanks to Paul for providing the link of to the radar image live site. I just jumped on and grabbed this SCREEN SHOT (below) of the moment at the end of the current video loop at 7am. There are several bird flock circles and/or polygons that are consistent with BARN SWALLOW flocks leaving their communal roost sites en mass. The one near Astoria from Svensen Island shows as a blob. That is the flock I watched in person on Tuesday night 19 September 2023. There looks to be a flock at North Portland around Smith Lake, and another flock near Fernhill Wetlands near Forest Grove. There are a few flocks around Grand Island in Yamhill County and three flock images near Albany.Cool. There must be a way to get the morning radar images as an archive one would think, but for now this link Paul provided is good for checking at dawn and just after to see the bird flocks on the weather radar on otherwise mornings mostly clear of precipitation.---------- Forwarded message ---------
From: Paul T. Sullivan <paults...@onlinenw.com>
Date: Wed, Sep 20, 2023, 08:55
Subject: RE: [obol] Re: Radar images of Barn Swallow fly-out, Yamhill county
To: David Bailey <davidcbai...@gmail.com>https://atmos.uw.edu/current-weather/northwest-radar/
You need to jump on the site near dawn. It displays about an hour’s worth of images. I don’t know if you can go backward.
Paul
From: David Bailey [mailto:davidcbai...@gmail.com]
Sent: Wednesday, September 20, 2023 8:15 AM
To: Paul Sullivan <paults...@onlinenw.com>
Cc: OBOL <ob...@freelists.org>; Yamhillbirds <yamhil...@freelists.org>; Bruce Cousens & Charlene Lee (PuMa Coord.) <pmar...@island.net>
Subject: Re: [obol] Re: Radar images of Barn Swallow fly-out, Yamhill county
Would you provide a link to a website where I can find these radar images to look up for Svensen Island from this morning?
On Wed, Sep 20, 2023, 08:04 Paul T. Sullivan <paults...@onlinenw.com> wrote:
Here is a series of screen captures of the weather radar from 6:40 – 7:02 AM this morning, showing the signature of the fly-out of the Barn Swallows that roosted SE of McMinnville last night. It begins as a small blob, grows to a ring and radiates outward. Note the position of McMinnville in the upper left of each frame.
Another ring radiating from near Buena Vista ferry appears in the last image. Since that location is over the horizon from the radar tower, the early blob was not detected. It only appeared when the ring of birds got high enough in the sky.
Paul Sullivan
McMinnville.