Demonstration of the benefit of increased temporal resolution provided by each Earth-based receiver in a network. (a) Time series cross section of equivalent potential temperature for 1200 UTC 23 May to 0000 UTC 24 May 1993 at Norman, OK (OUN) from radiosonde measurements. (b) Time series cross section of equivalent potential temperature with addition of GPS data constraints from Purcell, OK (PURC). Cloud outline indicates time of thunderstorm activity. Small triangles along the bottom of the figure indicate times that GPS data are available. Labels along ordinate indicate date/UTC time (adapted from Chiswell et al. 1996).