1. 1 Phased Array Weather Radar Program History SPY-1 vs. NEXRAD 1994 1995 1996 1997 1998 1999 2000 1991 1992 1993 2001 2002 1996-1997 1993 -1995 DTASS 1989-1993 TASS IR&D MOTR Wx Experiments 1995-1996 1998-2000 TEP At-Sea Demo Nat’l Wx Testbed 2000-2002 SPY-1 Weather Experiment 2000-2002 DUS&T

2. 2Goal Validate Basic Spectral Moments from SPY-1 with NEXRAD Result SPY-1 Matches NEXRAD Reflectivity, Velocity, Spectrum Spread SPY-1 Demonstrates Better Temporal Resolution NOTE: Threshold Applied to SPY-1 Reflectivity Map Above Noise Floor SPY-1 (Phased Array Radar): 1 minute scan NEXRAD: 6 minute scan SPY-1 vs. NEXRAD Composite Reflectivity Hurricane Fran Remnants Phased Array Radar Accurate Reflectivity Measurements 1996

3. 3 /