RaXPol

Ever since meteorological observations on radar were first made widespread, the need for high-temporal resolution and comprehensive volumetric imagery of all three dimensions of weather phenomena has been a very high priority, due in large part to the fact that hazardous weather often happens in the span of seconds, and often in the lowest 1 kilometer of the atmosphere.[4] In pursuit of better resolution in time, the NEXRAD network deploys several time-saving measures to accelerate data rates in these three dimensions, such as M.R.L.E. and MESO-SAILS, which can be bringing scan time down from 5–7 minutes to 2–3 minutes. In 2010, the University of Oklahoma's Advanced Radar Research Center began development of RaXPol, with a focus on rapid deployment and analysis of the atmosphere.[1] By early 2011, RaXPol was being deployed in field campaigns across Tornado Alley, and has taken part in numerous NSF funded research projects and organizations, such as PECAN,[5] TORUS,[6] and IMPACTS.[7]

RaXPol has documented numerous hazardous weather events throughout its deployment history, among them being several dozen particularly intense tornadoes. On May 24, 2011, RaXPol observed an extremely violent EF-5 tornado near El Reno, Oklahoma at very high temporal resolution, measuring doppler velocities in excess of 250 mph.[8] Two years later, RaXPol observed the widest tornado in recorded history (2.6 miles wide), also near the town of El Reno, retrieving among the highest doppler velocities ever recorded at 295 mph. Based on this data, the tornado was initially rated EF-5, but was later downgraded to an EF-3 due to the lack of supporting damage on the ground.[9] Data gathered from RaXPol also indicates that the formation of tornadoes may not be a top-down process as was once thought.[10]