woodcreeper

I rarely disagree with David’s radar interpretations, but for this night I would have concluded NMD - no migration detected. It is true that the radial velocities are faster than the surface winds — all New Jersey NWS stations that I checked indicated calm to light winds (<10 kts) from variable directions. However, upper air data at typical migrant altitudes show a high pressure center west of NJ. This would have produced winds in a north to northeast direction, very similar to the trends shown in the radial velocity images.

I got a mention of the woodcreeper site!!!
I did get some birds 40+ only 2 GCth but it was a good warm morning.
Bill

Noel and Bill, thanks for the comments.
Noel, I think we’ll have to agree to disagree (or maybe we disagree that we actually agree…or something), since I think that some of the signal could be due to whatever is ‘blowing in the wind’, although I also think that some of it is due to migration. If you check the NCAR data (which seems to have its resolution set a little finer, ie. the signal is better divided into more colors) it looks like there’s a proportion of the total signal that’s moving at a significantly higher velocity than the prevailing wind ( Such as in this image from 3am ). Unfortunately when Rutgers set up their display they seem to have lumped the 0-25kts display a little more than they should have for discerning bird migration (although they really don’t care about it unless it’s precipitation anyway).

Cheers!

David

hehe…a Scottsman calling himself a HillBilly…that just tickles me to no end.