The National Center for Atmospheric Research supplies four types of real-time weather data: satellite, radar, surface, and upper-air. In the satellite link, users have the choice to view images in either one of five wavelengths or one of the three multi-spectral assemblages. The images can also be viewed by the latest image, small loop, or a large loop. The WSR-88D radars provide images with various products, backgrounds, end date and time, and loop durations. Visitors can view interactive surface data (METARs) as well as Skew-T/Log-P diagrams of winds and temperatures at various pressures. The site also offers maps of surface and aloft forecasts.