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 6.31-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99 2012-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99 2013-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99 2014-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99 2015-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99 2016-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99 2017-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99 2018-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99 2019-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99 2020-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99-999.99 50 mb zonal wind index - CDAS ANOMALY YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1979 6.55 8.19 5.27 3.71 2.74 0.79 -3.28 -5.44 -7.84 -10.15 -11.11 -10.80 1980 -9.47 -9.49 -8.75 -8.80 -7.44 -2.76 3.00 5.80 7.63 7.90 8.15 8.19 1981 4.74 3.62 4.26 5.12 4.79 3.61 4.19 3.29 2.16 0.50 -0.65 -2.48 1982 -3.69 -6.14 -6.08 -7.18 -9.28 -12.09 -11.86 -8.73 -5.34 -1.89 2.51 5.52 1983 4.85 4.50 3.95 5.16 7.54 8.09 7.97 6.62 5.52 3.65 1.93 -0.07 1984 -1.75 -2.22 -2.45 -2.19 -4.61 -7.26 -10.14 -11.31 -11.95 -12.83 -12.64 -10.20 1985 -8.83 -7.19 -5.49 -1.47 2.11 5.07 7.33 9.02 9.32 9.31 8.00 6.36 1986 4.95 5.49 7.57 6.72 6.55 7.48 5.52 3.76 3.15 3.77 1.70 -0.32 1987 -0.83 -1.19 -2.71 -5.83 -9.96 -11.18 -12.46 -10.09 -5.24 -0.06 3.64 3.25 1988 2.97 3.40 2.71 3.39 4.42 6.48 7.09 6.73 6.77 5.65 4.74 3.05 1989 2.76 1.49 1.67 3.48 1.71 -0.32 -1.47 -2.42 -4.58 -6.89 -8.05 -8.66 1990 -8.48 -7.98 -8.01 -8.01 -3.56 2.30 7.02 9.20 8.49 8.76 9.01 8.74 1991 6.07 5.13 5.65 4.99 4.91 3.63 1.95 -0.19 0.14 0.15 -1.01 -2.16 1992 -2.88 -2.47 -3.90 -5.82 -7.53 -9.85 -11.09 -10.86 -8.74 -6.87 -5.55 -1.55 1993 2.79 3.81 3.88 5.43 8.04 8.92 8.66 7.33 7.41 5.73 3.72 2.64 1994 1.01 -0.03 0.42 -1.98 -5.88 -11.23 -13.25 -13.59 -15.17 -13.67 -9.13 -4.01 1995 -0.81 1.04 2.01 3.33 5.52 8.32 10.86 10.87 8.20 6.95 4.71 2.48 1996 1.69 2.04 1.13 0.90 -3.48 -6.51 -8.40 -9.66 -10.22 -11.77 -11.91 -9.49 1997 -9.34 -7.05 -7.14 -3.51 1.18 6.71 10.95 11.20 11.60 9.68 8.61 7.29 1998 4.30 3.42 3.09 2.53 -2.86 -8.70 -10.31 -10.43 -11.54 -13.27 -10.68 -7.54 1999 -4.87 -3.90 -1.40 0.70 4.30 8.08 10.59 10.47 10.11 9.26 7.63 7.75 2000 6.70 6.31 7.36 8.98 9.70 6.38 4.09 3.39 2.66 1.82 -0.53 -0.94 2001 -2.71 -2.95 -3.07 -2.54 -4.02 -6.82 -8.41 -12.20 -12.39 -11.92 -11.42 -8.80 2002 -6.07 -3.57 -0.24 3.90 6.62 8.76 9.25 10.93 10.86 9.52 8.00 5.76 2003 3.96 4.67 4.35 1.66 -1.73 -2.92 -3.63 -4.55 -6.06 -7.55 -9.81 -9.33 2004 -7.83 -5.54 -4.45 -0.81 3.14 7.01 10.10 11.32 8.94 9.23 8.08 7.66 2005 5.40 5.50 6.71 4.36 0.24 -3.07 -5.88 -6.86 -8.67 -11.16 -12.21 -12.64 2006 -14.05 -12.78 -10.94 -10.28 -6.19 1.71 7.37 8.45 11.46 11.14 10.72 9.21 2007 6.40 6.57 7.67 6.12 2.78 -2.55 -6.50 -8.23 -8.85 -10.40 -12.55 -14.18 2008 -15.77 -13.30 -10.60 -8.82 -4.53 3.81 9.75 10.57 9.37 8.43 6.88 7.51 2009 7.52 7.54 6.31 7.59 8.60 8.49 6.26 6.18 6.41 5.62 3.48 1.22 2010 0.91 0.13 -1.10 -8.72 -15.42 -18.23 -16.06 -9.17 -1.58 5.20 8.55 8.29 2011 5.17 5.37 5.55-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 2012-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 2013-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 2014-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 2015-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 2016-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 2017-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 2018-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 2019-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 2020-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 50 mb zonal wind index - CDAS STANDARDIZED DATA YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1979 0.99 1.24 0.80 0.56 0.41 0.12 -0.50 -0.82 -1.19 -1.54 -1.68 -1.63 1980 -1.43 -1.43 -1.32 -1.33 -1.13 -0.42 0.45 0.88 1.15 1.19 1.23 1.24 1981 0.72 0.55 0.64 0.77 0.72 0.55 0.63 0.50 0.33 0.08 -0.10 -0.37 1982 -0.56 -0.93 -0.92 -1.09 -1.40 -1.83 -1.79 -1.32 -0.81 -0.29 0.38 0.83 1983 0.73 0.68 0.60 0.78 1.14 1.22 1.20 1.00 0.84 0.55 0.29 -0.01 1984 -0.26 -0.34 -0.37 -0.33 -0.70 -1.10 -1.53 -1.71 -1.81 -1.94 -1.91 -1.54 1985 -1.33 -1.09 -0.83 -0.22 0.32 0.77 1.11 1.36 1.41 1.41 1.21 0.96 1986 0.75 0.83 1.14 1.02 0.99 1.13 0.83 0.57 0.48 0.57 0.26 -0.05 1987 -0.13 -0.18 -0.41 -0.88 -1.51 -1.69 -1.88 -1.53 -0.79 -0.01 0.55 0.49 1988 0.45 0.51 0.41 0.51 0.67 0.98 1.07 1.02 1.02 0.85 0.72 0.46 1989 0.42 0.23 0.25 0.53 0.26 -0.05 -0.22 -0.37 -0.69 -1.04 -1.22 -1.31 1990 -1.28 -1.21 -1.21 -1.21 -0.54 0.35 1.06 1.39 1.28 1.32 1.36 1.32 1991 0.92 0.78 0.85 0.75 0.74 0.55 0.29 -0.03 0.02 0.02 -0.15 -0.33 1992 -0.44 -0.37 -0.59 -0.88 -1.14 -1.49 -1.68 -1.64 -1.32 -1.04 -0.84 -0.23 1993 0.42 0.58 0.59 0.82 1.22 1.35 1.31 1.11 1.12 0.87 0.56 0.40 1994 0.15 0.00 0.06 -0.30 -0.89 -1.70 -2.00 -2.06 -2.29 -2.07 -1.38 -0.61 1995 -0.12 0.16 0.30 0.50 0.83 1.26 1.64 1.64 1.24 1.05 0.71 0.38 1996 0.26 0.31 0.17 0.14 -0.53 -0.98 -1.27 -1.46 -1.54 -1.78 -1.80 -1.44 1997 -1.41 -1.07 -1.08 -0.53 0.18 1.01 1.66 1.69 1.75 1.46 1.30 1.10 1998 0.65 0.52 0.47 0.38 -0.43 -1.32 -1.56 -1.58 -1.74 -2.01 -1.61 -1.14 1999 -0.74 -0.59 -0.21 0.11 0.65 1.22 1.60 1.58 1.53 1.40 1.15 1.17 2000 1.01 0.95 1.11 1.36 1.47 0.96 0.62 0.51 0.40 0.28 -0.08 -0.14 2001 -0.41 -0.45 -0.46 -0.38 -0.61 -1.03 -1.27 -1.84 -1.87 -1.80 -1.73 -1.33 2002 -0.92 -0.54 -0.04 0.59 1.00 1.32 1.40 1.65 1.64 1.44 1.21 0.87 2003 0.60 0.71 0.66 0.25 -0.26 -0.44 -0.55 -0.69 -0.92 -1.14 -1.48 -1.41 2004 -1.18 -0.84 -0.67 -0.12 0.47 1.06 1.53 1.71 1.35 1.40 1.22 1.16 2005 0.82 0.83 1.01 0.66 0.04 -0.46 -0.89 -1.04 -1.31 -1.69 -1.85 -1.91 2006 -2.12 -1.93 -1.65 -1.56 -0.94 0.26 1.11 1.28 1.73 1.68 1.62 1.39 2007 0.97 0.99 1.16 0.93 0.42 -0.39 -0.98 -1.24 -1.34 -1.57 -1.90 -2.14 2008 -2.38 -2.01 -1.60 -1.33 -0.69 0.58 1.47 1.60 1.42 1.27 1.04 1.14 2009 1.14 1.14 0.95 1.15 1.30 1.28 0.95 0.93 0.97 0.85 0.53 0.18 2010 0.14 0.02 -0.17 -1.32 -2.33 -2.76 -2.43 -1.39 -0.24 0.79 1.29 1.25 2011 0.78 0.81 0.84-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 2012-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 2013-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 2014-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 2015-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 2016-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 2017-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 2018-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 2019-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90 2020-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90-999.90