Friday, September 11, 2009
Hawk Migration forecast
Sunday, clearing in afternoon, high 70, winds NW 5-10 mph
Monday, mostly sunny, high 74, low 54, winds 5-10 mph gusts of 20 mph
Tuesday, partly cloudy, high 70, winds nw 10-15 mph, gusts to 25 mph
So we think hawks will move from Sunday through Tuesday. There could be a big push Sunday into Monday. The majority of the hawks that pass inland are Broad-winged Hawks who use rising thermals of warm air, gliding up on them, then tucking their wings and riding to the next thermal. It's an energy efficient (because they do not have to flap as much), way to make their long migration out of North America and into Central and South America. Broadwings migrate in the biggest flocks, most other hawks migrate in smaller flocks, or singly. Broadwings wait for favorable conditions, including northerly winds and thermals. So the conditions look good although the gusty winds on Monday and Tuesday could blow apart the thermals, not a good thing from a Broadwings point of view. But we will see.
Even if you don't make it up to Pack Monadnock, or any of the other hawkwatching sites in New England, look up in the sky during the next few days, you may see some Broad-winged Hawks.