Step 2: Repeat the triangle fold for each mountain fold (page) of the structure.
Step 3: Here is where my model diverges from Hedi Kyle's. Unfold all of the triangle folds made above and reverse fold the first one on the mountain fold as shown above.
Step 4: Unfold the next mountain fold, making it a valley fold and fold the triangles toward you. Your model should look like the picture above.
Step 5: Keep the next mountain fold and fold the triangles to the back of the structure. Repeat this process, first folding the triangles towards you then unfolding the next mountain fold and folding the triangles to the back until you reach the end of the paper.
Step 6: Your model should look like the picture above. The one below gives a different angle showing the triangle folds going back and forth.
Step 7: Close up the model along the valley folds and mountain folds. Notice that the structure is now twice as wide. That is because we opened up every other mountain fold in the previous steps.
Step 8: Now we return to the Blizzard Fold and starting with the first page fold the triangle sections into the middle of the pages.
Step 9: The next set of triangles is on the back side of the model. Fold them in as shown above.
Step 10: Continue folding in the triangles at the back and front of the accordion folds, tucking in and folding along existing lines. Use the pictures to help you get your model working.
This picture shows the triangle flaps being folded in on the second page.
Here is the model with the first and second pages and their triangles folded in. Note how the rest of the model looks at this stage.
The third set of triangles are now folded up.
Here is the other side of the model at this stage.
The forth set of triangles are now folded up and the folding is complete.
This is the model from the other side. At this point you can use the model as a linear structure. It has these 4 niches on one side and 3 on the other. Or you can proceed and get the pinwheel pictured below.
Step 11: If you want to turn the model into a self closing pinwheel structure make sure the model has the side with 4 niches facing you. Grab the first and last page and pull them towards each other, but away from you and the niches will open out to form the structure you see above and below.
Step 12: To get the model to stay in this open position, take the triangle tabs from the last page and fold them over the triangle tabs on the first page (shown in the picture above on the left).
Here I have turned the model into an artist's book using paper threads to represent waves.