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
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.