1. Daily Average TPW Western U.S. May 1 – Dec 31, 2012 Daily Average TPW Eastern U.S. May 1 – Dec 31, 2012

2. Jun 0.76 0.79 -0.02 Jul 0.94 0.87 -0.51 Aug 1.09 0.91 -0.94 Sep - -0.82 Oct 0.54 0.56 -0.60 Nov 0.45 0.46 -0.58 Dec 0.46 0.42 -0.43 Jun 2.15 2.06 0.88 Jul 1.65 1.74 0.56 Aug 1.33 1.38 0.27 Sep - -0.02 Oct 1.26 1.14 0.37 Nov 1.06 0.95 0.33 Dec 0.84 0.81 0.25 Bias Collocated Comparisons (Retrievals-GPS wrt GFS-GPS) May 1.69 1.66 0.30 May 0.52 0.56 -0.34

3. 1 st Guess Comparisons (Guess’s-GPS wrt GFS-GPS) May 0.88 0.79 0.30 May 0.48 0.35 -0.34 Jun 0.70 0.55 -0.02 Jul 0.88 0.69 -0.51 Aug 0.71 0.62 -0.94 Sep - -0.82 Oct 0.40 0.34 -0.60 Nov 0.32 0.30 -0.58 Dec 0.45 0.37 -0.43 Jun 1.34 1.25 0.88 Jul 1.15 1.07 0.56 Aug 1.05 1.00 0.27 Sep - -0.02 Oct 0.88 0.89 0.37 Nov 0.76 0.75 0.33 Dec 0.65 0.60 0.25 Bias

4. Jun 0.76 0.96 -0.02 Jul 0.95 1.22 -0.51 Aug 1.09 1.01 -0.94 Sep - 0.87 -0.82 Oct 0.58 0.61 -0.60 Nov 0.44 -0.58 Dec 0.45 0.40 -0.43 Jun 2.15 2.60 0.88 Jul 1.64 2.47 0.56 Aug 1.33 2.48 0.27 Sep - 2.09 -0.02 Oct 1.26 1.37 0.37 Nov 1.05 1.08 0.33 Dec 0.83 0.89 0.25 Bias All Comparisons (Retrievals-GPS wrt GFS-GPS) May 1.69 1.99 0.30 May 0.52 0.72 -0.34

5. 1 st Guess Comparisons (Guess’s-GPS wrt GFS-GPS) May 0.33 0.53 0.30 May 0.22 0.05 -0.34 Jun 0.64 0.25 -0.02 Jul 0.78 0.39 -0.51 Aug 0.25 -0.50 -0.94 Sep - -0.45 -0.82 Oct 0.03 -0.25 -0.60 Nov -0.23 -0.37 -0.58 Dec 0.14 -0.04 -0.43 Jun 0.94 1.11 0.88 Jul 1.07 0.78 0.56 Aug 0.78 0.47 0.27 Sep - 0.39 -0.02 Oct 0.82 0.79 0.37 Nov 0.69 0.64 0.33 Dec 0.55 0.44 0.25 Bias

6. Std Dev Collocated Comparisons (Retrievals-GPS wrt GFS-GPS) Jun 2.26 2.66 3.10 Jul 3.18 3.55 3.73 Aug 3.04 3.69 3.95 Sep - 3.56 Oct 2.29 2.45 2.71 Nov 2.08 2.20 2.41 Dec 1.88 2.06 2.42 Jun 3.10 3.85 3.14 Jul 3.38 4.19 3.27 Aug 3.06 3.80 3.14 Sep - 2.71 Oct 1.98 2.41 2.18 Nov 1.73 2.09 1.73 Dec 1.70 2.05 1.95 May 2.56 3.27 2.93 May 1.98 2.16 2.52

7. 1 st Guess Comparisons (Guess’s-GPS wrt GFS-GPS) Jun 2.53 2.48 3.10 Jul 3.46 3.54 3.73 Aug 3.12 3.19 3.95 Sep - 3.56 Oct 2.41 2.46 2.71 Nov 2.02 2.01 2.41 Dec 1.84 1.95 2.42 Jun 2.92 2.88 3.14 Jul 3.10 3.05 3.27 Aug 2.93 2.89 3.14 Sep - 2.71 Oct 1.71 1.70 2.18 Nov 1.56 1.73 Dec 1.43 1.40 1.95 May 2.42 2.93 May 2.21 2.18 2.52 Std Dev

8. All Comparisons (Retrievals-GPS wrt GFS-GPS) Std Dev Jun 3.10 4.48 3.14 Jul 3.39 5.00 3.27 Aug 3.06 4.76 3.14 Sep - 4.18 2.71 Oct 1.98 2.82 2.18 Nov 1.73 2.37 1.73 Dec 1.70 2.50 1.95 May 2.56 3.85 2.93 Jun 2.25 2.88 3.10 Jul 3.18 3.90 3.73 Aug 3.02 4.03 3.95 Sep - 3.21 3.56 Oct 2.29 2.60 2.71 Nov 2.08 2.31 2.41 Dec 1.88 2.10 2.42 May 1.98 2.32 2.52

9. 1 st Guess Comparisons (Guess’s-GPS wrt GFS-GPS) May 2.17 2.16 2.52 Jun 2.41 2.58 3.10 Jul 3.50 3.64 3.73 Aug 3.15 3.78 3.95 Sep - 3.10 3.56 Oct 2.51 2.54 2.71 Nov 2.21 2.26 2.41 Dec 1.90 1.96 2.42 Std Dev Jun 2.82 2.95 3.14 Jul 3.11 3.18 3.27 Aug 2.96 3.08 3.14 Sep - 2.56 2.71 Oct 1.73 1.84 2.18 Nov 1.58 1.60 1.73 Dec 1.44 1.48 1.95 May 2.48 2.60 2.93

10. RMS Collocated Comparisons (Retrievals-GPS wrt GFS-GPS) Jun 2.40 2.77 3.12 Jul 3.32 3.64 3.79 Aug 3.27 3.78 4.10 Sep - 3.67 Oct 2.36 2.52 2.79 Nov 2.12 2.24 2.50 Dec 1.94 2.09 2.47 Jun 3.82 4.46 3.29 Jul 3.83 4.61 3.34 Aug 3.37 4.07 3.19 Sep - 2.74 Oct 2.37 2.68 2.24 Nov 2.05 2.31 1.80 Dec 1.93 2.23 2.03 May 3.12 3.73 2.99 May 2.06 2.23 2.55

11. 1 st Guess Comparisons (Guess’s-GPS wrt GFS-GPS) RMS Jun 2.64 2.53 3.12 Jul 3.57 3.58 3.79 Aug 3.24 3.63 4.10 Sep - 3.67 Oct 2.43 2.46 2.79 Nov 2.03 2.02 2.50 Dec 1.89 1.98 2.47 Jun 3.25 3.16 3.29 Jul 3.35 3.27 3.34 Aug 3.15 3.09 3.19 Sep - 2.74 Oct 1.94 2.24 Nov 1.76 1.75 1.80 Dec 1.59 1.54 2.03 May 2.62 2.58 2.99 May 2.27 2.19 2.55

12. RMS All Comparisons (Retrievals-GPS wrt GFS-GPS) Jun 2.40 3.05 3.12 Jul 3.32 4.11 3.79 Aug 3.25 4.17 4.10 Sep - 3.34 3.67 Oct 2.37 2.68 2.79 Nov 2.13 2.35 2.50 Dec 1.93 2.14 2.47 Jun 3.82 5.23 3.29 Jul 3.83 5.65 3.34 Aug 3.37 5.40 3.19 Sep - 4.71 2.74 Oct 2.36 3.17 2.24 Nov 2.05 2.63 1.80 Dec 1.92 2.68 2.03 May 3.13 4.41 2.99 May 2.06 2.44 2.55

13. 1 st Guess Comparisons (Guess’s-GPS wrt GFS-GPS) May 2.22 2.17 2.55 Jun 2.61 2.60 3.12 Jul 3.58 3.68 3.79 Aug 3.29 3.84 4.10 Sep - 3.16 3.67 Oct 2.54 2.58 2.79 Nov 2.26 2.32 2.50 Dec 1.94 1.98 2.47 Jun 3.12 3.18 3.29 Jul 3.34 3.31 3.34 Aug 3.14 3.15 3.19 Sep - 2.60 2.74 Oct 1.94 2.03 2.24 Nov 1.76 1.75 1.80 Dec 1.58 1.59 2.03 May 2.67 2.70 2.99 RMS

14. Num Collocated Comparisons (Retrievals-GPS wrt GFS-GPS) Jun 48 47 123 Jul 37 129 Aug 41 140 Sep - 144 Oct 52 54 154 Nov 44 46 150 Dec 36 37 157 Jun 79 159 Jul 78 168 Aug 62 63 169 Sep - 164 Oct 62 61 171 Nov 93 167 Dec 68 168 May 78 76 166 May 49 51 113

15. 1 st Guess Comparisons (Guess’s-GPS wrt GFS-GPS) Num Jun 47 48 123 Jul 35 34 129 Aug 35 30 140 Sep - 144 Oct 52 54 154 Nov 44 47 150 Dec 37 157 Jun 83 82 159 Jul 79 168 Aug 62 169 Sep - 164 Oct 61 171 Nov 94 167 Dec 67 68 168 May 83 84 166 May 51 52 113

16. Num All Comparisons (Retrievals-GPS wrt GFS-GPS) Jun 49 69 123 Jul 38 67 129 Aug 41 71 140 Sep - 71 144 Oct 53 72 154 Nov 46 61 150 Dec 38 53 157 May 50 71 113 Jun 79 127 159 Jul 78 135 168 Aug 62 132 169 Sep - 128 164 Oct 62 126 171 Nov 94 123 167 Dec 70 101 168 May 78 129 166

17. 1 st Guess Comparisons (Guess’s-GPS wrt GFS-GPS) Jun 49 69 123 Jul 38 67 129 Aug 41 71 140 Sep - 71 144 Oct 53 72 154 Nov 46 61 150 Dec 38 53 157 May 50 71 113 Jun 79 127 159 Jul 78 135 168 Aug 62 132 169 Sep - 128 164 Oct 62 126 171 Nov 94 123 167 Dec 70 101 168 May 78 129 166