Water Vapor is a great tool to see areas of moisture. Note: This product only shows upper level moisture, not low level, such as marine moisture producing our typical low cloudiness. The green colors represent the highest elevation moisture in the atmosphere, which often indicates the deepest moisture columns. Dry spots are shown with no imagery, meaning the brown color of the basemap. Looping the imagery will show rotation of upper level disturbances, often not seen by looking at IR satellite photos.