Analysis SLP RMS Error – Case #1 : Verified versus GFS Analysis Date Control LTNG2 # of ltng obs. LTNG4 6hr LTNG4 1hr LTNG4 1hr 5mm # of ltng obs 12/16/2002 – 00 1.83 1.55 12 1.50 5 1.48 1.52 10 12/16/2002 – 06 1.86 2.03 21 1.85 11 23 12/16/2002 – 12 1.94 1.98 66 24 1.91 1.97 58 12/16/2002 – 18 1.65 1.59 35 1.57 1.60 40 12/17/2002 – 00 1.42 1.47 76 1.27 31 1.29 12/17/2002 – 06 1.30 1.43 94 1.41 47 1.37 113 12/17/2002 – 12 1.62 1.18 42 1.38 1.33 102 12/17/2002 – 18 1.39 1.35 27 54 12/18/2002 – 00 1.75 1.76 16 1.45 1.49 52 12/18/2002 – 06 1.93 79 2.05 44 1.44 114 12/18/2002 – 12 1.23 1.36 129 1.24 61 193 12/18/2002 – 18 2.09 145 74 2.00 1.96 173 12/19/2002 – 00 1.79 175 1.82 81 1.63 1.53 202 12/19/2002 – 06 195 104 227 12/19/2002 – 12 1.58 185 1.54 121 1.74 213 12/19/2002 – 18 1.51 117 51 125 12/20/2002 – 00 2.04 1.69 46 28 59 12/20/2002 – 06 15 1.84 48 12/20/2002 – 12 1.46 55 12/20/2002 – 18 1.28 8 1.26 1.32

Analysis H500 RMS Error – Case #1 : Verified versus GFS Analysis Date Control LTNG2 # of ltng obs. LTNG4 6hr LTNG4 1hr LTNG4 1hr 5mm # of ltng obs 12/16/2002 – 00 12.1 13.6 12 11.8 5 11.7 11.5 10 12/16/2002 – 06 21.0 20.8 21 17.9 11 17.6 23 12/16/2002 – 12 20.2 16.0 66 15.8 24 14.9 15.3 58 12/16/2002 – 18 21.4 20.6 35 19.1 40 12/17/2002 – 00 21.3 21.5 76 20.0 31 18.7 12/17/2002 – 06 22.0 94 19.9 47 20.1 113 12/17/2002 – 12 22.6 22.5 19.5 42 20.4 19.8 102 12/17/2002 – 18 26.4 26.3 22.3 27 24.0 23.2 54 12/18/2002 – 00 21.2 21.9 16.9 16 17.7 52 12/18/2002 – 06 26.1 24.5 79 22.1 44 22.4 114 12/18/2002 – 12 129 18.2 61 18.1 16.5 193 12/18/2002 – 18 20.9 145 74 173 12/19/2002 – 00 19.6 175 15.7 81 18.3 202 12/19/2002 – 06 195 104 18.4 227 12/19/2002 – 12 16.4 185 14.5 121 15.4 13.7 213 12/19/2002 – 18 117 16.3 51 17.3 16.8 125 12/20/2002 – 00 16.1 46 13.4 28 14.1 13.0 59 12/20/2002 – 06 17.1 15 19.3 48 12/20/2002 – 12 11.2 10.6 10.5 55 12/20/2002 – 18 8 13.2 13.8