This is the extensive irruption Seattle's Capitol Hill owl was part of.

The irruption was documented statewide in an interesting article by Kelly Cassidy (Washington Birds 6: 68-82, 1997), now available on the WOS website thanks to the efforts of Jennifer Kauffman and Jane Hadley :

https://wos.org/documents/Publications/WA%20Birds/1997/WaBirds-Journal-Vol-6-1997.pdf

Good reading!

Hal Opperman
Seattle, WA