AMWG Variability Diagnostics

Dave Williamson's Draft of the WGNE Standard Diagnostics of Variability.

3-Hourly Data plots

  • Diurnal cycle of precipitation plots
  • Amplitude and phase of 1st harmonic of the diurnal cycle of precipitation

    6-Hourly Data plots

  • Wavenumber-frequency power spectra plots
  • Equatorial Hovmöller plots of U200, U850, OLR, and anomalies

    Daily Data plots

  • Hovmöller plots of 200 mb velocity potential
  • Madden-Julian Oscillation index plots
  • Precipitation rate histograms
  • EOF analysis
  • lag-cross-correlations
  • wavenumber-frequency spectra
  • composite life cycles

    Monthly/Seasonal Data plots

  • Equatorial Pacific Hovmöller plots of anomalies
  • Timeseries of surface temperature anomalies
  • Timeseries of Niño 1&2, Niño 3, Niño 4 anomalies
  • Timeseries of precipitation anomalies
  • Timeseries of total cloud amount anomalies
  • Timeseries of sea-level pressure anomalies
  • EOFs of N Pacific and Atlantic winter 500 mb geopotential height
  • Amplitude and phase of annual cycle of precip and 2-meter temp

    Developers: Mark Stevens, Rich Neale, Julie Caron, Dani Coleman, Jadwiga Richter, and Jack Chen
    send questions and comments to
    Jack Chen (