Small movement despite the winds

Drew WeberGeneral News and Info, Migration Update, PredictionsLeave a Comment

Regional Overview

Unfortunately the radar site is down where I download the individual images to animate so we will have to rely on the national composite.

The composite images however do show an interesting pattern. There was a moderate movement last night despite the light south winds. In addition, there were spots of precipitation moving north along the East Coast. These factors combined could produce a higher number of migrants concentrated in urban parks and other hotspots where rain passed through overnight.

I don’t always have time to comment on the radar in each state. To interpret it yourself, read the quick tutorial at the bottom of the page.

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Quick guide to interpreting the radar

On the top row (reflectivity radar), the images show the magnitude of migration. When birds are migrating, it looks like a donut shape around the center of the radar station.

The bottom row is the velocity radar. This shows the direction that the objects detected by the radar station are moving. Blues are moving towards the radar station, yellows and reds are moving away from the station. So for southbound migration, blue should be on the top half of the donut, yellow on the bottom half.

Watch for precipitation moving through during the night hours, this can cause birds to stop migrating in a concentrated area, creating the fabled ‘fallout’, particularly on nights with strong migration.

For more in depth info, watch this video.
For migration updates or other regions check-

Pac NW – Birds Over Portland by Greg Haworth

I need your help! These reports will only be as good as the feedback I get on these updates. Please leave comments on interesting patterns of migration you are seeing in the field so I can incorporate some ground truthing to my forecasts and predictions. Thanks!