This is Snowflake #17 in the book of 100 Snowflakes. Instructions are on Page 52. Pictured on Page 25 in the Showcase.

“Chains and loops decorate this lacy snowflake, which is named for a cold, squally wind that blows from the Danube region.”

Finished diameter: 2-5/8 in. (67 mm)
Thread required: 5 yd (4.6 m)

All pattern samples in this book are made with size 10 thread and a size 5 (1.9 mm) crochet hook.