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HOME > Monitoring and Data > Monitoring Weather & Climate > Indices and Forecasts > Daily MJO Indices > Pentad MJO Indices
 
 

Extended Empirical Orthogonal Function (EEOF) analysis is applied to pentad 200-hPa velocity potential (CHI200) anomalies equatorward of 30°N during ENSO-neutral and weak ENSO winters (November-April) in 1979-2000. See CPC ENSO classification .

Ten MJO indices are the minus projection of the pentad CHI200 anomalies onto the ten time-lagged patterns of the first EEOF of pentad CHI200 anomalies.

Anomalies are based on the 1979-1995 period, and each index is normalized by its standard deviation during ENSO-neutral and weak ENSO winters (November-April) in 1979-2000.

Pentad MJO indices since 1978:

  • Graphical format (click each year in the following table)

Note that the blueish (reddish) color represents the enhanced (suppressed ) convection, and the x-axis labels the centers (20°E, 70°E, 80°E, 100°E, 120°E, 140°E, 160°E, 120°W, 40°W and 10°W) of enhanced convection for the ten indices, which are determined from the ten time-lagged patterns of the first EEOF of CHI200.

1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014  
 
Ascii format for downloading

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