Looks a lot like the ones I'm doing right now as well. I start with my land shape, expand the selection, new layer, fill with a pattern of stripes (1 black and 4 white), invert the selection and fill the rest with black, invert selection again and small ripple, invert again and feather the selection, invert the colors and then stylize - wind on the tips (to keep the ripple on the inner part and fade out the tips and wind works best on white for some reason), invert colors again, delete the whites, and lastly a small blur. I'll post mine up in my Tabletia thread right now if you want to see 'em.