Frames are every 1/2 hour for reflectivity and velocity, and every hour for the regional composite. Click on the thumbnail to view the full-sized animation.
As you can see on each velocity plot, all activity is moving from N–>S and at speeds consistent with the prevailing winds last. Based on this, we can rule out any nocturnal bird migration. Interestingly, we saw similar patterns on yesterday’s radar…but Don Freiday reported a decent flight of a few species including American Robin, Eastern Meadowlark and Yellow-rumped Warbler…which begs the question as to whether these were birds that had already been local and decided to move in the early morning, or if they simply “came through under the radar” and were actually migrating undetected on Sunday night. It’s interesting, and just goes to show that the radar is a course tool that must be ground-truthed, so thanks again to those of you who regularly post your observations.
P.S. Come check out my migration forecast for the Mid-Atlantic on Birdcapemay.org
Membership in the Woodcreeper/Badbirdz flock is growing! So far most new members hail from my homestate of Florida, but a few Jerseybirders have joined the club. Remember, membership has its privileges, so read the Become a Member post to find out more and become a member today!
One response to “Southerly winds keeping the birds down”
Quick report on Mon. 10-22-07 Rutgers Cook College co-op garden and grassland area : 20+ Palm Warblers , 4 Fielid Sparrows, 1 Eastern Pheobe, Coopers Hawk , 20+ Song Sparrows