I think Derecho, by Laura Aylor, is a wonderful design. I have stared and stared at it, trying to figure out its road map. Here is my crocheted tribute to Laura's lovely knitted design-- Meg's Wrap.
Meg's Wrap is made entirely of US single crochet. It is 68 inches in length (172.7cm) and 29 and 1/4 inches (74.2cm) at the widest point after blocking.
Like Derecho, Meg's Wrap is made with three colors of yarn--a light color, a medium color, and a dark color. My hanks of Isager Spinni contain 330 yds per hank. So, I had to purchase 2 of each color to complete the wrap. Based on the yarn I had remaining, here are my estimates of yarn needed: Dark-400-430 yds, Light-400-430 yds, and Medium 530-570 yds (Medium is the gold color in my wrap).
The top edge, the longest edge of the triangle, will need a little straightening when you block it.