05 Mar 2015 – Migration Update

Migration density picked up a bit last night.  There is even some moderate (green returns) movement in the east counties.  Up through Clackamas and straight towards Mt. Hood.  Mount Hood is that bright green stationary dot on the border of Clackamas and Hood River Counties.

Click on image below to bring up a full screen view.

04 March 2015 — Migration Update

Birds are on the move!  Very low level, but enough to detect on the radar.  These are probably water fowl moving around and not any vanguard neo-tropicals.  The listserve chatter remains the same — early Rufous Hummers and Turkey Vultures.

February 2015 (first report)

I’ve been checking in on the radar every now and then.  The only thing i am seeing is low density movement.  It’s a bit heavier at times and i suspect this is ducks and geese moving up the valley between the refuges and wildlife management areas.

First reports for vanguard individuals for species of: Turkey Vulture, Tree and Violet-green Swallows and Rufus Hummingbirds.

That’s all for now.

Migration Update 13 October 2014

The migrants are still trickling through, again mainly along the east side.

The bulk of the Greater White-fronted Geese appear to have moved on.  I didn’t see any this weekend.  No signs of the Snow Geese or Swans yet, but a few more ducks have turned up – Ring-necked and Lesser Scaup.  All of the winter sparrows are firmly in place.

As a FYI: it’s a hunt day on Sauvie Island today.

Migration Update 10 October 2014

It may be getting a bit late in the season but it’s not over yet!  The past few nights since the last update were pretty much repeats.  Moderate to heavy migration with an east side bias.  If you can make it up to a high Cascade Lake before dawn it’s a good time to catch the haunting calls of loons as the sun comes up.

One interesting artifact in this and the last loop are the cloud capped peaks of the Cascades.  Rainier, Adams and Hood and just a hint of Helens stand out in the sea of green.

Migration Update 07 Oct 2014

Take a look at the radar last night.  Notice that the bulk of the migration is over on the east side, up over the Cascades.  These are probably the divers moving south.  Now is the peak time for finding loons, and grebes on the high Cascade lakes.

Migration Update for 03 October 2014

The wind has shifted a bit and has more of a NE than last night’s NW component.  But, still out of the North and the birds took flight again in moderate to locally heavy numbers.

And the Swallows are still taking off in the morning from their roost along the Willamette River.  Watch closely — it goes by fast.

Remember to check in at Paul’s archived radar site for a look at migration on a national level.  Birds were jamming down the Central Flyway last night.

20141003_BV-RTX

Migration Update for 02 October 2014

Another fine night of nocturnal flight.

Weather conditions were ideal with a bit of a tail wind out of the NW, clear skies, and an urge to push south.  Birds are on the move.

Watch the tail end of the radar loop below closely (Click on the gallery to bring up a screen size image).  As the migrants thin out, but not quite put down, a small bright green flash appears along the Willamette River between Yamhill and Marion counties — Swallows.

Migration Update 01 Oct 2014

It’s been a busy month for the migrants.  A huge push of Greater White-fronted Geese last week. Cacklers are back in force and duck numbers are building, some even showing basic plumage. Shorebirds have probably peeked but are still on the move.  Winter sparrows are in as are the Kinglets.  Migrant summer resident breeders have moved out for the most part.  Fall

Last night the high pressure system spinning up off shore drove northerly wind on a relatively clear night and the birds took advantage.

Migration Update 16 Sept 2014

A fairly decent night of migration in the face of light crosswinds out of the east and upper level southerly flow.  The bloom sticks mainly to the east side of the I5 corridor.

The .gif file below shows the dBZ reaching the 25 – 30 range indicating heavy, if not widespread, migration last night.

RTX Base Velocity 16 Sept 2014

RTX Base Velocity 16 Sept 2014

On the Barn Swallow front; examining the past static images, and the one enclosed today, it appears there is actually three roosts taking off just after dawn. In today’s image i have highlighted the clusters just as they begin to rise and prior to dispersal.

Barn Swallow Morning Fly-out.

Barn Swallow Morning Fly-out.