Just as an observation from someone who has been birding New Castle County 
Delaware and Cecil County MD heavily since 1980, I have chased many kettles 
of Broad winged Hawks thru the area on there peak migration days. Days when 
the cold fronts have passed thru with them riding before the front and days 
after the front. Your assessment of this theory to me is a fact. I have followed 
Kettles with Thousands from Wilmington DE straight into Newark Delaware and 
continued following them on back roads all the way into Elkton and thru North 
East between the Route 40 and I 95 Corridor. I grew up in Fair Hill, just North 
of Elkton, which has the first ridge of Piedmont right before the Coastal Plain 
and I believe that this is what the majority follow. Wilmington and Newark are 
also geographically based in the same location. 
I in fact am surprised at the numbers of Broad-winged Hawks we do get at 
Turkey Point, but It is no where near the number of what the Piedmont areas 
do. Turkey Point is a transfer funnel. Birds that are going with or with out a 
choice to the coastal plain. 
The Majority of Broad-winged Hawks from my observations at Turkey Point 
have be First Year birds, I rarely see Adults. A guestamate ratio for me would 
be 25 to 1 Sub adult to Adults. 
Good Luck and more importantly, have fun.
To me a better observation area in Havre de Grace would be the Bulle Rock 
area. It is the First Big ridge above the Coastal Plain and has an unrestricted 
View in Many locations with proper elevation.
Happy Birding.
Sean McCandless
Cecil Bird Club President.
Elkton, MD