Alexander D. Schenkman

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The Advanced Regional Prediction System (ARPS) model is employed to perform high-resolution numerical simulations of a mesoscale convective system and associated cyclonic line-end vortex (LEV) that spawned several tornadoes in central Oklahoma on 8–9 May 2007. The simulation uses a 1000 km 3 1000 km domain with 2-km horizontal grid spacing. The ARPS(More)
The impact of radar and Oklahoma Mesonet data assimilation on the prediction of mesovortices in a tor-nadic mesoscale convective system (MCS) is examined. The radar data come from the operational Weather Surveillance Radar-1988 Doppler (WSR-88D) and the Engineering Research Center for Collaborative Adaptive Sensing of the Atmosphere's (CASA) IP-1 radar(More)
The Advanced Regional Prediction System (ARPS) is used to simulate a tornadic mesovortex with the aim of understanding the associated tornadogenesis processes. The mesovortex was one of two tornadic meso-vortices spawned by a mesoscale convective system (MCS) that traversed southwestern and central Okla-homa on 8–9 May 2007. The simulation used 100-m(More)
A 50-m-grid-spacing Advanced Regional Prediction System (ARPS) simulation of the 8 May 2003 Oklahoma City tornadic supercell is examined. A 40-min forecast run on the 50-m grid produces two F3-intensity tornadoes that track within 10 km of the location of the observed long-track F4-intensity tornado. The development of both simulated tornadoes is analyzed(More)
a r t i c l e i n f o a b s t r a c t The current status and challenges associated with two aspects of Warn-on-Forecast—a National Oceanic and Atmospheric Administration research project exploring the use of a convective-scale ensemble analysis and forecast system to support hazardous weather warning operations—are outlined. These two project aspects are(More)
The 8 May 2003 Oklahoma City tornadic supercell is predicted with the ARPS model using four nested grids with 9-km, 1-km, 100-m, and 50-m grid spacings. The Oklahoma City WSR-88D radar radial velocity and reflectivity data are assimilated through the ARPS 3DVAR and cloud analysis on the 1-km grid to generate an initial condition that includes a(More)
The Advanced Regional Prediction System (ARPS) prediction model is employed to perform high resolution numerical simulations of a mesoscale convective system and associated cyclonic line-end vortex (LEV) that spawned several tornadoes in central Oklahoma on 8-9 May 2007. The simulation uses a 1000 km x 1000 km domain with 2 km horizontal grid spacing. The(More)
In this two-part paper, the impact of assimilating data from the WSR-88D and the Engineering Research Center for Collaborative Adaptive Sensing of the Atmosphere's (CASA) IP-1 radar network on the prediction of a tornadic mesoscale convective system is examined. The Advanced Regional Prediction System (ARPS) prediction model is employed to perform(More)