A new project called Wind Map, created by two Google employees, visualizes wind patterns across the United States using hourly data from the National Weather Service. Along with the "live" wind animation, there's also an archive of previous days' patterns.
The map's creators, Fernanda Viégas and Martin Wattenberg, are the co-leaders of Google's "Big Picture" research group, responsible for visualizing Google's search data.
Wind Map doesn't appear to be an official Google project, and Google Maps is run by a separate team, but its conceivable we could see wind patterns as a Maps layer one day.
For right now, though, Viégas and Wattenberg are just looking to expand it outside the U.S., as soon as they can find a reliable source of global wind data.