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Avian migration and high pressures – September 28, 2014

Posted on Sep 28, 2014

Did you enjoy the summer-like weather across the Northeast this weekend? At this time of year if it feels that gorgeous and benefits warm weather lovers it denies the birds a cooperative migratory flight. This radar grab from a few minutes ago shows very light migration across much of New England and the upper Mid-Atlantic thanks to a few weak areas of high pressure giving us this warmth and mostly calm or light southerly winds. One high is centered over Lake Michigan, another between Iowa and Missouri and a third in Virginia, with all three causing the only decent avian movement to be found on their eastern halves where light west/north winds are present thanks to the clockwise rotation of air around high pressure centers.

Avian migration 09-28-14