HIGHLIGHT:  The seasonal mean NINO3.4 anomaly was substantially positive at 0.37 C for AMJ2014,  but not yet +0.5 or better. 

The CA method, acting on global AMJ2014 seasonal means as latest input, but using a string of global SST going back one year, has all of its members staying positive but in the neutral zone for Nino34 thru MJJ2014.  By JJA 2014 six out of twelve members pass the +0.5C threshold, and all members grow >+0.5 soon thereafter, and eleven members to +1.0K or more by late 2014, max=1.38K.

Weights have changed from last month, indicative of a situation with larger than normal uncertainty. The last 10 years no longer have positive weights only and some older years have unusually high weights (1959 +0.17). There are 9 (6) large +ve (-ve) weights in excess of abs(0.10).

1988 (thru December 2012 that particular past situation was labeled 1986, and thru last month it was labelled 1987) carries on at -0.14. A remarkable case of determinism, lasting 2 years and ongoing still. 

Table 1. Inner products (IP; scaled such that the sum of absolute values is 100; not shown) and weights (Wgt multiplied by 100.) of each of the years to construct an analogue to the sequence of 12 consecutive overlapping 3-month periods defined as the base (currently the 12 overlapping seasons string MJJ2013 thru AMJ2014). Years in the table are labeled by the year of the middle month of the most recent predictor season. Weights for 1956 and 2013 are less (by 50%) because only half the members use these years ("early" members use 1956, "late" members 2013). Data currently thru Jun 2014.

Year

IP

Wgt

Year

IP

Wgt

Year

IP

Wgt

Year

IP

Wgt

Year

IP

Wgt

Year

IP

Weigt

1956

xx

-6

1966

xx

-6

1976

Xx

-2

1986

xx

6

1996

xx

2

2006

xx

-7

1957

xx

12

1967

xx

-6

1977

Xx

0

1987

xx

-4

1997

xx

12

2007

xx

-4

1958

xx

-2

1968

xx

3

1978

Xx

6

1988

xx

-14

1998

xx

-2

2008

xx

-2

1959

xx

17

1969

xx

-10

1979

Xx

5

1989

xx

-1

1999

xx

-10

2009

xx

12

1960

xx

-5

1970

xx

1

1980

Xx

-5

1990

xx

8

2000

xx

-15

2010

xx

11

1961

xx

-8

1971

xx

-7

1981

Xx

-4

1991

xx

9

2001

xx

6

2011

xx

13

1962

xx

5

1972

xx

-1

1982

Xx

-7

1992

xx

3

2002

xx

10

2012

xx

4

1963

xx

4

1973

xx

5

1983

xx

-8

1993

xx

-3

2003

xx

12

2013

xx

9

1964

xx

-11

1974

xx

11

1984

Xx

-7

1994

xx

-4

2004

xx

-3

xx

Xx

1965

xx

-11

1975

xx

0

1985

Xx

3

1995

xx

-4

2005

xx

5

xx

Xx

 

Weights are high +ve (>+0.10) for 2011, 2010, 2009, 2003, 2002,1997,1974,1959,1957

Weights are high -ve (< - 0.10) for 2000, 1999, 1988,1969,1965,1964

 

Ens ave Nino34 anomaly forecasts, for leads -3, -2, -1, 0 etc: in plain numbers (ensemble mean):

0.37

0.4

0.51

0.56

0.63

0.81

1.05

1.15

1.1

0.96

0.74

0.59

0.39

0.21

0.11

0.1

0.1

0.12

0.16

0.16

0.11

MJJ

JAS14

SON

NDJ

JFM15

MAM

MJJ

JAS

SON15

NDJ

One month ago:

0.13

0.16

0.3

0.5

0.48

0.51

0.64

0.82

0.89

0.83

0.7

0.55

0.46

0.25

0.13

0.04

0.1

0.08

0.04

0

-0.02

MAM

MJJ

JAS

SON

NDJ

JFM

MAM2015

MJJ

JAS

SON

NDJ

Two months ago:

-0.45

-0.4

-0.27

0.02

0.25

0.42

0.41

0.41

0.51

0.68

0.72

0.62

0.49

0.4

0.31

0.19

0.11

0.07

0.1

0.11

0.11

JFM14

MAM

MJJ

JAS

SON14

NDJ

JFM15

MAM

MJJ

JAS

SON

Three month ago:

-0.37

-0.37

-0.34

-0.25

-0.1

0.07

0.19

0.14

0.12

0.2

0.37

0.4

0.34

0.32

0.29

0.3

0.3

0.28

0.3

0.32

0.34

JFM14

MAM

MJJ

JAS

SON14

NDJ

JFM15

MAM

MJJ

JAS

Four months ago:

-0.13

-0.17

-0.21

-0.24

-0.16

0.01

0.17

0.32

0.29

0.34

0.43

0.6

0.61

0.54

0.43

0.39

0.35

0.3

0.25

0.26

0.28

NDJ

JFM14

MAM

MJJ

JAS

SON

NDJ

JFM15

MAM

MJJ

JAS

 

Anomalies relative to 1981-2010 climo.