Date: 9/9/17 7:19 am
From: Paul Sullivan <paultsullivan...>
Subject: [obol] Re: Barn Swallow fly-out from Grand Island
For those new to OBOL, or who forgot how this works from last year:



Huge numbers of BARN SWALLOWS gather each evening in September each year to
roost in cornfields on or near Grand Island, which is in SE Yamhill County
along the Willamette River.

If conditions are not rainy, the morning fly-out of these birds can be seen
on weather radar. If you call up Portland weather radar on
www.wunderground.com <http://www.wunderground.com> look for the scale on
the left side of the image. If it is set to sensitive settings -28dBZ to
+28dBZ (like this morning) then conditions are favorable.



There are arrows at the top of the image that will let you scroll back and
forth in time, or you can click on a "play" arrow to play a loop.

Look for a green burst in the SE corner of Yamhill County. You need to be
looking at dawn, because the website only plays the most recent half hour or
so.

At 6:20 AM - nothing

At 6:30 AM - a green dot

At 6:40 AM - a donut over Grand Island

At 6:49 AM - a large ring over the N end of Marion county

At 6:59 AM - dispersed to Clackamas county



Enjoy,



Paul Sullivan



From: Paul Sullivan [mailto:<paultsullivan...>]
Sent: Saturday, September 09, 2017 6:54 AM
To: <obol...>; <YamhillBirders...>;
<birding...>
Cc: <pmartins...>
Subject: Barn Swallow fly-out from Grand Island



The fly-out of BARN SWALLOWS from their Grand Island roost can be seen on
radar this morning!



Call up the Portland weather radar and look in the southeast corner of
Yamhill County.



https://www.wunderground.com/radar/radblast.asp?zoommode=pan
<https://www.wunderground.com/radar/radblast.asp?zoommode=pan&prevzoom=zoom&
num=6&frame=0&delay=15&scale=1.000&noclutter=0&ID=RTX&type=N0R&showstorms=0&
lat=45.20659256&lon=-123.21671295&label=McMinnville,%20OR&map.x=400&map.y=24
0&scale=1.000&centerx=400&centery=240&showlabels=1&rainsnow=0&lightning=0&le
rror=20&num_stns_min=2&num_stns_max=9999&avg_off=9999&smooth=0>
&prevzoom=zoom&num=6&frame=0&delay=15&scale=1.000&noclutter=0&ID=RTX&type=N0
R&showstorms=0&lat=45.20659256&lon=-123.21671295&label=McMinnville,%20OR&map
.x=400&map.y=240&scale=1.000&centerx=400&centery=240&showlabels=1&rainsnow=0
&lightning=0&lerror=20&num_stns_min=2&num_stns_max=9999&avg_off=9999&smooth=
0





The first burst of bright green appears at 6:30 AM, then grows to a small
donut at 6:40 (now). It will continue to grow and disperse until it
dissolves.



I plan to head out there before sunset, 7:30 PM, and try to find which
cornfield they are using.



Paul Sullivan

McMinnville


 
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