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| IR images show warmer temperatures as dark and cooler as white. The image is composed of the tops of wherever the IR bounced back. So to the west in the image is a cold air mass. The Great Lakes are discernable and still quite cool compared to the land around them. This tells us these temps are from the surface. In fact, there may still be ice on the Great Lakes but probably not. A check of a visible image could verify that. The waters off the Bay are interesting - cold inland but a fair amount of warm water offshore, some of which is collecting in eddies. Another neat thing in this image is the phenomenon known as 'heat islands.' It had been quite warm for several days so concrete had had time to begin to retain heat. If you look for Baltimore and Washington DC and other major cities they show up as collections of dark pixels showing that concrete holds heat better than land not yet affected by urbanization. | |||