50 mb zonal wind index - CDAS
ORIGINAL DATA
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
1979 7.38 8.84 6.03 5.86 5.48 1.43 -5.54 -8.78 -10.56 -11.28 -11.08 -10.58
1980 -8.64 -8.84 -7.99 -6.65 -4.70 -2.12 0.74 2.46 4.91 6.77 8.18 8.41
1981 5.57 4.27 5.02 7.27 7.53 4.25 1.93 -0.05 -0.56 -0.63 -0.62 -2.26
1982 -2.86 -5.49 -5.32 -5.03 -6.54 -11.45 -14.12 -12.07 -8.06 -3.02 2.54 5.74
1983 5.68 5.15 4.71 7.31 10.28 8.73 5.71 3.28 2.80 2.52 1.96 0.15
1984 -0.92 -1.57 -1.69 -0.04 -1.87 -6.62 -12.40 -14.65 -14.67 -13.96 -12.61 -9.98
1985 -8.00 -6.54 -4.73 0.68 4.85 5.71 5.07 5.68 6.60 8.18 8.03 6.58
1986 5.78 6.14 8.33 8.87 9.29 8.12 3.26 0.42 0.43 2.64 1.73 -0.10
1987 0.00 -0.54 -1.95 -3.68 -7.22 -10.54 -14.72 -13.43 -7.96 -1.19 3.67 3.47
1988 3.80 4.05 3.47 5.54 7.16 7.12 4.83 3.39 4.05 4.52 4.77 3.27
1989 3.59 2.14 2.43 5.63 4.45 0.32 -3.73 -5.76 -7.30 -8.02 -8.02 -8.44
1990 -7.65 -7.33 -7.25 -5.86 -0.82 2.94 4.76 5.86 5.77 7.63 9.04 8.96
1991 6.90 5.78 6.41 7.14 7.65 4.27 -0.31 -3.53 -2.58 -0.98 -0.98 -1.94
1992 -2.05 -1.82 -3.14 -3.67 -4.79 -9.21 -13.35 -14.20 -11.46 -8.00 -5.52 -1.33
1993 3.62 4.46 4.64 7.58 10.78 9.56 6.40 3.99 4.69 4.60 3.75 2.86
1994 1.84 0.62 1.18 0.17 -3.14 -10.59 -15.51 -16.93 -17.89 -14.80 -9.10 -3.79
1995 0.02 1.69 2.77 5.48 8.26 8.96 8.60 7.53 5.48 5.82 4.74 2.70
1996 2.52 2.69 1.89 3.05 -0.74 -5.87 -10.66 -13.00 -12.94 -12.90 -11.88 -9.27
1997 -8.51 -6.40 -6.38 -1.36 3.92 7.35 8.69 7.86 8.88 8.55 8.64 7.51
1998 5.13 4.07 3.85 4.68 -0.12 -8.06 -12.57 -13.77 -14.26 -14.40 -10.65 -7.32
1999 -4.04 -3.25 -0.64 2.85 7.04 8.72 8.33 7.13 7.39 8.13 7.66 7.97
2000 7.53 6.96 8.12 11.13 12.44 7.02 1.83 0.05 -0.06 0.69 -0.50 -0.72
2001 -1.88 -2.30 -2.31 -0.39 -1.28 -6.18 -10.67 -15.54 -15.11 -13.05 -11.39 -8.58
2002 -5.24 -2.92 0.52 6.05 9.36 9.40 6.99 7.59 8.14 8.39 8.03 5.98
2003 4.79 5.32 5.11 3.81 1.01 -2.28 -5.89 -7.89 -8.78 -8.68 -9.78 -9.11
2004 -7.00 -4.89 -3.69 1.34 5.88 7.65 7.84 7.98 6.22 8.10 8.11 7.88
2005 6.23 6.15 7.47 6.51 2.98 -2.43 -8.14 -10.20 -11.39 -12.29 -12.18 -12.42
2006 -13.22 -12.13 -10.18 -8.13 -3.45 2.35 5.11 5.11 8.74 10.01 10.75 9.43
2007 7.23 7.22 8.43 8.27 5.52 -1.91 -8.76 -11.57 -11.57 -11.53 -12.52 -13.96
2008 -14.94 -12.65 -9.84 -6.67 -1.79 4.45 7.49 7.23 6.65 7.30 6.91 7.73
2009 8.35 8.19 7.07 9.74 11.34 9.13 4.00 2.84 3.69 4.49 3.51 1.44
2010 1.74 0.78 -0.34 -6.57 -12.68 -17.59 -18.32 -12.51 -4.30 4.07 8.58 8.51
2011 6.00 6.02 6.31 6.25 8.24 9.30 9.35 9.06 10.00 11.46 8.50 2.40
2012 0.27 -0.56 -0.83 -0.32 -1.04 -4.25 -8.11 -9.76 -11.42 -10.51 -10.65 -11.70
2013 -9.65 -8.66 -8.32 -5.71 -3.60 1.99 5.77 7.02 7.64 8.70 9.74 9.95
2014 9.71 10.00 9.20 9.72 10.09 4.96 0.50 -0.15 -1.03 -2.32 -5.24 -8.61
2015 -9.95 -10.60 -11.21 -13.27 -16.25 -12.43 -6.13 0.58 5.83 9.14 9.32 7.61
2016 5.76 3.92 2.40 -1.83 -5.10 -7.64 -7.83 -3.60 0.21 4.53 7.11 8.70
2017 9.66 9.90 9.80 10.72 11.68 8.77 5.08 2.58 1.89 1.72 1.26 0.29
2018 -0.30 -1.10 -0.17 -1.17 -6.23 -11.97 -16.32 -18.07 -18.67 -14.35 -9.67 -5.32
2019 -3.28 -2.07 2.44 6.28 10.04 10.32 7.28 6.44 4.54 5.00 4.19 4.72
2020 1.89 -0.96 -2.16 -5.54 -9.06 -9.71 -8.12 -4.07 2.28 6.94 8.09 8.36
2021 7.25 6.25 7.53 8.26 9.41 6.40 2.82 0.71 1.22 0.59 -0.63 -3.23
2022 -6.07 -6.60 -5.18 -7.23 -12.39 -13.36 -12.16 -6.87 -0.52 5.13 7.86 8.12
2023 8.05 7.00 7.70 11.10 12.48 11.39 5.96 2.67 1.12 1.60 -0.38 -6.82
2024 -9.10 -11.01 -11.07 -14.35 -13.15 -11.32 -7.02 -1.35 4.93 9.54 12.17-999.90
2025-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90
2026-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90
2027-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90
2028-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90
50 mb zonal wind index - CDAS
ANOMALY
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
1979 7.25 8.58 5.23 3.47 2.64 0.65 -3.60 -5.81 -8.25 -10.35 -10.97 -10.61
1980 -8.77 -9.10 -8.79 -9.04 -7.54 -2.90 2.68 5.43 7.22 7.70 8.29 8.38
1981 5.44 4.01 4.22 4.88 4.69 3.47 3.87 2.92 1.75 0.30 -0.51 -2.29
1982 -2.99 -5.75 -6.12 -7.42 -9.38 -12.23 -12.18 -9.10 -5.75 -2.09 2.65 5.71
1983 5.55 4.89 3.91 4.92 7.44 7.95 7.65 6.25 5.11 3.45 2.07 0.12
1984 -1.05 -1.83 -2.49 -2.43 -4.71 -7.40 -10.46 -11.68 -12.36 -13.03 -12.50 -10.01
1985 -8.13 -6.80 -5.53 -1.71 2.01 4.93 7.01 8.65 8.91 9.11 8.14 6.55
1986 5.65 5.88 7.53 6.48 6.45 7.34 5.20 3.39 2.74 3.57 1.84 -0.13
1987 -0.13 -0.80 -2.75 -6.07 -10.06 -11.32 -12.78 -10.46 -5.65 -0.26 3.78 3.44
1988 3.67 3.79 2.67 3.15 4.32 6.34 6.77 6.36 6.36 5.45 4.88 3.24
1989 3.46 1.88 1.63 3.24 1.61 -0.46 -1.79 -2.79 -4.99 -7.09 -7.91 -8.47
1990 -7.78 -7.59 -8.05 -8.25 -3.66 2.16 6.70 8.83 8.08 8.56 9.15 8.93
1991 6.77 5.52 5.61 4.75 4.81 3.49 1.63 -0.56 -0.27 -0.05 -0.87 -1.97
1992 -2.18 -2.08 -3.94 -6.06 -7.63 -9.99 -11.41 -11.23 -9.15 -7.07 -5.41 -1.36
1993 3.49 4.20 3.84 5.19 7.94 8.78 8.34 6.96 7.00 5.53 3.86 2.83
1994 1.71 0.36 0.38 -2.22 -5.98 -11.37 -13.57 -13.96 -15.58 -13.87 -8.99 -3.82
1995 -0.11 1.43 1.97 3.09 5.42 8.18 10.54 10.50 7.79 6.75 4.85 2.67
1996 2.39 2.43 1.09 0.66 -3.58 -6.65 -8.72 -10.03 -10.63 -11.97 -11.77 -9.30
1997 -8.64 -6.66 -7.18 -3.75 1.08 6.57 10.63 10.83 11.19 9.48 8.75 7.48
1998 5.00 3.81 3.05 2.29 -2.96 -8.84 -10.63 -10.80 -11.95 -13.47 -10.54 -7.35
1999 -4.17 -3.51 -1.44 0.46 4.20 7.94 10.27 10.10 9.70 9.06 7.77 7.94
2000 7.40 6.70 7.32 8.74 9.60 6.24 3.77 3.02 2.25 1.62 -0.39 -0.75
2001 -2.01 -2.56 -3.11 -2.78 -4.12 -6.96 -8.73 -12.57 -12.80 -12.12 -11.28 -8.61
2002 -5.37 -3.18 -0.28 3.66 6.52 8.62 8.93 10.56 10.45 9.32 8.14 5.95
2003 4.66 5.06 4.31 1.42 -1.83 -3.06 -3.95 -4.92 -6.47 -7.75 -9.67 -9.14
2004 -7.13 -5.15 -4.49 -1.05 3.04 6.87 9.78 10.95 8.53 9.03 8.22 7.85
2005 6.10 5.89 6.67 4.12 0.14 -3.21 -6.20 -7.23 -9.08 -11.36 -12.07 -12.45
2006 -13.35 -12.39 -10.98 -10.52 -6.29 1.57 7.05 8.08 11.05 10.94 10.86 9.40
2007 7.10 6.96 7.63 5.88 2.68 -2.69 -6.82 -8.60 -9.26 -10.60 -12.41 -13.99
2008 -15.07 -12.91 -10.64 -9.06 -4.63 3.67 9.43 10.20 8.96 8.23 7.02 7.70
2009 8.22 7.93 6.27 7.35 8.50 8.35 5.94 5.81 6.00 5.42 3.62 1.41
2010 1.61 0.52 -1.14 -8.96 -15.52 -18.37 -16.38 -9.54 -1.99 5.00 8.69 8.48
2011 5.87 5.76 5.51 3.86 5.40 8.52 11.29 12.03 12.31 12.39 8.61 2.37
2012 0.14 -0.82 -1.63 -2.71 -3.88 -5.03 -6.17 -6.79 -9.11 -9.58 -10.54 -11.73
2013 -9.78 -8.92 -9.12 -8.10 -6.44 1.21 7.71 9.99 9.95 9.63 9.85 9.92
2014 9.58 9.74 8.40 7.33 7.25 4.18 2.44 2.82 1.28 -1.39 -5.13 -8.64
2015 -10.08 -10.86 -12.01 -15.66 -19.09 -13.21 -4.19 3.55 8.14 10.07 9.43 7.58
2016 5.63 3.66 1.60 -4.22 -7.94 -8.42 -5.89 -0.63 2.52 5.46 7.22 8.67
2017 9.53 9.64 9.00 8.33 8.84 7.99 7.02 5.55 4.20 2.65 1.37 0.26
2018 -0.43 -1.36 -0.97 -3.56 -9.07 -12.75 -14.38 -15.10 -16.36 -13.42 -9.56 -5.35
2019 -3.41 -2.33 1.64 3.89 7.20 9.54 9.22 9.41 6.85 5.93 4.30 4.69
2020 1.76 -1.22 -2.96 -7.93 -11.90 -10.49 -6.18 -1.10 4.59 7.87 8.20 8.33
2021 7.12 5.99 6.73 5.87 6.57 5.62 4.76 3.68 3.53 1.52 -0.52 -3.26
2022 -6.20 -6.86 -5.98 -9.62 -15.23 -14.14 -10.22 -3.90 1.79 6.06 7.97 8.09
2023 7.92 6.74 6.90 8.71 9.64 10.61 7.90 5.64 3.43 2.53 -0.27 -6.85
2024 -9.23 -11.27 -11.87 -16.74 -15.99 -12.10 -5.08 1.62 7.24 10.47 12.28-999.90
2025-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90
2026-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90
2027-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90
2028-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90
50 mb zonal wind index - CDAS
STANDARDIZED DATA
YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
1979 0.99 1.18 0.72 0.48 0.36 0.09 -0.49 -0.80 -1.13 -1.42 -1.50 -1.45
1980 -1.20 -1.25 -1.20 -1.24 -1.03 -0.40 0.37 0.74 0.99 1.05 1.14 1.15
1981 0.74 0.55 0.58 0.67 0.64 0.48 0.53 0.40 0.24 0.04 -0.07 -0.31
1982 -0.41 -0.79 -0.84 -1.02 -1.29 -1.68 -1.67 -1.25 -0.79 -0.29 0.36 0.78
1983 0.76 0.67 0.54 0.67 1.02 1.09 1.05 0.86 0.70 0.47 0.28 0.02
1984 -0.14 -0.25 -0.34 -0.33 -0.65 -1.01 -1.43 -1.60 -1.69 -1.79 -1.71 -1.37
1985 -1.11 -0.93 -0.76 -0.23 0.27 0.68 0.96 1.19 1.22 1.25 1.12 0.90
1986 0.77 0.81 1.03 0.89 0.88 1.01 0.71 0.46 0.38 0.49 0.25 -0.02
1987 -0.02 -0.11 -0.38 -0.83 -1.38 -1.55 -1.75 -1.43 -0.77 -0.04 0.52 0.47
1988 0.50 0.52 0.37 0.43 0.59 0.87 0.93 0.87 0.87 0.75 0.67 0.44
1989 0.47 0.26 0.22 0.44 0.22 -0.06 -0.24 -0.38 -0.68 -0.97 -1.08 -1.16
1990 -1.07 -1.04 -1.10 -1.13 -0.50 0.30 0.92 1.21 1.11 1.17 1.25 1.22
1991 0.93 0.76 0.77 0.65 0.66 0.48 0.22 -0.08 -0.04 -0.01 -0.12 -0.27
1992 -0.30 -0.29 -0.54 -0.83 -1.05 -1.37 -1.56 -1.54 -1.25 -0.97 -0.74 -0.19
1993 0.48 0.58 0.53 0.71 1.09 1.20 1.14 0.95 0.96 0.76 0.53 0.39
1994 0.23 0.05 0.05 -0.30 -0.82 -1.56 -1.86 -1.91 -2.13 -1.90 -1.23 -0.52
1995 -0.02 0.20 0.27 0.42 0.74 1.12 1.44 1.44 1.07 0.92 0.66 0.37
1996 0.33 0.33 0.15 0.09 -0.49 -0.91 -1.19 -1.37 -1.46 -1.64 -1.61 -1.27
1997 -1.18 -0.91 -0.98 -0.51 0.15 0.90 1.46 1.48 1.53 1.30 1.20 1.02
1998 0.68 0.52 0.42 0.31 -0.41 -1.21 -1.46 -1.48 -1.64 -1.85 -1.44 -1.01
1999 -0.57 -0.48 -0.20 0.06 0.58 1.09 1.41 1.38 1.33 1.24 1.06 1.09
2000 1.01 0.92 1.00 1.20 1.31 0.86 0.52 0.41 0.31 0.22 -0.05 -0.10
2001 -0.28 -0.35 -0.43 -0.38 -0.56 -0.95 -1.20 -1.72 -1.75 -1.66 -1.55 -1.18
2002 -0.74 -0.44 -0.04 0.50 0.89 1.18 1.22 1.45 1.43 1.28 1.12 0.81
2003 0.64 0.69 0.59 0.19 -0.25 -0.42 -0.54 -0.67 -0.89 -1.06 -1.32 -1.25
2004 -0.98 -0.71 -0.62 -0.14 0.42 0.94 1.34 1.50 1.17 1.24 1.13 1.08
2005 0.84 0.81 0.91 0.56 0.02 -0.44 -0.85 -0.99 -1.24 -1.56 -1.65 -1.71
2006 -1.83 -1.70 -1.50 -1.44 -0.86 0.22 0.97 1.11 1.51 1.50 1.49 1.29
2007 0.97 0.95 1.05 0.81 0.37 -0.37 -0.93 -1.18 -1.27 -1.45 -1.70 -1.92
2008 -2.07 -1.77 -1.46 -1.24 -0.63 0.50 1.29 1.40 1.23 1.13 0.96 1.05
2009 1.13 1.09 0.86 1.01 1.16 1.14 0.81 0.80 0.82 0.74 0.50 0.19
2010 0.22 0.07 -0.16 -1.23 -2.13 -2.52 -2.24 -1.31 -0.27 0.68 1.19 1.16
2011 0.80 0.79 0.76 0.53 0.74 1.17 1.55 1.65 1.69 1.70 1.18 0.32
2012 0.02 -0.11 -0.22 -0.37 -0.53 -0.69 -0.84 -0.93 -1.25 -1.31 -1.44 -1.61
2013 -1.34 -1.22 -1.25 -1.11 -0.88 0.17 1.06 1.37 1.36 1.32 1.35 1.36
2014 1.31 1.33 1.15 1.00 0.99 0.57 0.33 0.39 0.18 -0.19 -0.70 -1.18
2015 -1.38 -1.49 -1.65 -2.15 -2.62 -1.81 -0.57 0.49 1.12 1.38 1.29 1.04
2016 0.77 0.50 0.22 -0.58 -1.09 -1.15 -0.81 -0.09 0.35 0.75 0.99 1.19
2017 1.31 1.32 1.23 1.14 1.21 1.10 0.96 0.76 0.58 0.36 0.19 0.04
2018 -0.06 -0.19 -0.13 -0.49 -1.24 -1.75 -1.97 -2.07 -2.24 -1.84 -1.31 -0.73
2019 -0.47 -0.32 0.22 0.53 0.99 1.31 1.26 1.29 0.94 0.81 0.59 0.64
2020 0.24 -0.17 -0.41 -1.09 -1.63 -1.44 -0.85 -0.15 0.63 1.08 1.12 1.14
2021 0.98 0.82 0.92 0.80 0.90 0.77 0.65 0.50 0.48 0.21 -0.07 -0.45
2022 -0.85 -0.94 -0.82 -1.32 -2.09 -1.94 -1.40 -0.53 0.25 0.83 1.09 1.11
2023 1.08 0.92 0.95 1.19 1.32 1.45 1.08 0.77 0.47 0.35 -0.04 -0.94
2024 -1.27 -1.54 -1.63 -2.29 -2.19 -1.66 -0.70 0.22 0.99 1.43 1.68-999.90
2025-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90
2026-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90
2027-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90
2028-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90
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