The plan is to maximize use of observing systems currently operated by the SMN and to augment
these with research systems currently maintained by U.S. agencies. There are five SMN sounding
sites in Tier 1 – Guaymas, Mazatlan, Torreon, Chihuahua, and La Paz. There are four 5-cm
Doppler radars in Tier 1 – Obregon, Gusave, Cabo San Lucas, and Palmito.
The sounding sites are presumed to be fully functional, so experimental design constraints mainly
concern the frequency and scheduling of soundings and the provision of expendables as may be
required. All of the radars are operational, however, none currently meet standards for systematic
recording of calibrated 3-D reflectivity and velocity data required to address the scientific
objectives.
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