This is Snowflake #53 in the book of 100 Snowflakes. Instructions are on Page 74. It is pictured on page 30 in the showcase.

“This swirling pattern is named for a cold north wind in Tyrol, Austria.”

Finished diameter: 2 3/4 in (70 mm)
Thread required: 6 yd (5.5 m)

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