Weather plays a significant role in migration. I found this Weather Map Primer resource from Journey North. Since it touches upon some of my favorite explorer topics- birds, maps, weather-I was excited to see it. I really like how the weather map reading is applied to birding.
I am facilitating a monthly online professional development opportunity and March's topic is migrations. This resource will make it into the lesson.
Also on that Weather Map Primer page I found a link to current global wind conditions which is not only interesting but visually stunning as well.