NASA's Hurricane and Severe Storm Sentinel (HS3) field campaign to study mechanisms leading to tropical cyclone formation and intensity changes is employing a dual-frequency (Ka- and Ku-band), dual beam conically scanning Doppler radar - the High-altitude Imaging Wind and Rain Airborne Profiler (HIWRAP) (Heymsfield et al. 2008) - mounted on a Northrop Grumman Teledyne RG-4A Global Hawk UAS. A preliminary study using an observation system simulation experiment (OSSE) has demonstrated the potential use of this remote observation system for tropical cyclone prediction (Sippel et al. 2013, in press).
Using the Pennsylvania State University (PSU) WRF-EnKF assimilation system and an adapted version for the Navy's Coupled Ocean-Atmosphere Mesoscale Prediction System for tropical cyclones (COAMPS-TC), the forecasts of Hurricane Karl (2010) are examined for ensemble simulations assimilating P-3 and Global Hawk HIWRAP airborne Doppler radar velocity super observations (SOs). The SO generation methodologies for both P-3 and HIWRAP Doppler radial velocities are discussed.
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