Meteo Maps
NEXRAD
The Next Generation Weather Radar (NEXRAD) system currently comprises 160 sites throughout the United States and select overseas locations. The NCEI archive includes the base data, called Level-II, and the derived products, called Level-III. Level-II data include the original three meteorological base data quantities: reflectivity, mean radial velocity, and spectrum width, as well as the dual-polarization base data of differential reflectivity, correlation coefficient, and differential phase.
From the Level-II data, computer processing generates numerous meteorological analysis products known as Level-III data. All the National Weather Service (NWS) and several select continental U.S. Department of Defense NEXRAD sites record Level-II data. The majority of the sites record Level-III products. When NCEI receives the data, it is archived and disseminated.