I haven’t been posting daily updates recently because migration had really slowed down by last night migrants were showing up on the radar across the Northeast and most places will be getting a big push of late migrants, just in time for the Big Sit weekend.
The reflectivity radar across NY, PA, NJ and down into MD and DE were showing the highest concentrations of migrants that I remember seeing all season. A trip to any migrant trap should be productive today with a lot of sparrows, kinglets, sapsuckers and other typical later migrants.
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.
Pennsylvania & New Jersey
Maryland and Delaware
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!