First, for the Wind Filter to work properly, you need to flatten and invert your document. From the PhotoShop menu, select Layer>Flatten Image, and then select Image>Adjust>Invert. You can also invert the image by using the shortcut key (Ctrl - I for Windows) or (Command - I for MAC).
Once you invert your image, rotate the document 90º clockwise by choosing Image>Rotate Canvas>90º CW from the PhotoShop menu.
Now run the Wind Filter twice. Choose Filter>Stylize>Wind (Method: Wind; Direction: From The Left) and click OK. The Wind Filter Dialog and settings are shown at the top right. Run Wind again by using the shortcut key (Ctrl/Command - F) or by choosing Filter>Wind from the PhotoShop menu. Your image should look like the image shown bottom right.
Now rotate your document back upright by selecting Image>Rotate Canvas>90° CCW.