SEATTLE — Washington's night sky will be filled with millions of migrating birds in the coming nights.

According to BirdCast data , on the night of September 18-19, over 6.4 million birds crossed Washington state, and around 1.3 million birds in King County alone.

During the spring and fall months, billions of birds migrate across the United States, mainly at night. In Washington state, the fall migration season typically peaks around late September to early October.

In the spring, peak migration is estimated to occur in early to mid-May. Researchers at BirdCast and Purdue University's AeroEco Lab use radar, atmospheric data and modeling, historical records, and many other tools to study bird migration.

It helps researchers understand flight patterns and how artificial light and popu

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