Sorry - not currently a free pattern.
http://www.accuquilt.com/go-storm-at...t-pattern.html
You can see which dies you would need, and probably figure the pattern out easily enough. Fabric requirements would be a guess, though.
Do you have an Accuquilt account? No cost, you don't have to buy anything from them, but they will send you e-mails of specials, discounts, free patterns, etc.