Hourly Max Updraft Helicity (2-5 km AGL) 23-hr Forecasts Valid 23z 20 May 2013 NAM 4 km CONUS Nest 4 km WRF-NMM NSSL 4 km WRF-ARW NSSL Radar Low-Level Rotation Tracks 22-23z Max 125 m2/s2 Max 175 m2/s2 Max 200 m2/s2
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