When you make your predictions you should keep these things in mind. However, although much has been written about this, I'm not sure how much is speculative. Clear, sunny days seem to really set up ideal conditiond or maximum thermal updrafts, which eagles really prefer for their movements. In the case of our eagles, the Hudson River, Lake Champlain and the St. Lawrence River may be significant. The ability to soar high and far is absolutely dependent on the weather, particularly on the wind and the sun.
Wind is very important to migrating eagles.
If there is no wind at all, eagles can't soar and are likely to stay put or travel only very locally. Eagles in spring won't move much on overcast days. Rain or snow or low clouds can cause eagles to stop moving until conditions clear. According to our telemetry studies, migrating eagles can fly as many as 225 miles in a day. The average distance per day of one of our eagles was 98 miles.