NOAA's 10 cm Doppler Weather Radar was a 10 cm wavelength S-band Doppler Weather Radar, commonly referred to as "NSSL Doppler" and was used to track severe weather and related meteorological phenomena. The radar became operational soon after its donation, collecting its first data in May 1971. Data was collected on magnetic tapes and processed on a NASA computer post event due to the lack of real-time capability at the time.