earth”, and it lets you look at winds, temperature, humidity, pollutants, ocean waves, and more – and you can see them anywhere in the world. It's all driven by satellite data, and much of the data is updated in near realtime (within a few hours). The least fresh data I could find was at most five days old. You can even look at the data with a variety of map projections. Amazing to have this at your fingertips!
I took the screenshot at right this morning, showing the winds over the U.S. At first I thought that winds were all it could show, but then I clicked on the “earth” menu at the lower left corner, and a whole 'nother world opened up. Take a gander!