Measuring the strength of ENSO events: How does 1997/98 rank?

for the Niiiol+2,3 and 4 regions back to 1970), ‘olr’ (equatorial Pacific OLR back to 1974), ‘soi.his’ (the SO1 from 1882 to 1950) and many more. With ENSO now recognised as having a global impact, it is also useful to keep up to date with ter. The Climate Diagnostics Center also provides a variety of weekly, monthly and seasonal data on-line via its ‘map room’ site (N), while weekly weather highlights (of interest even without an El Niiio) give an indication of weather extremes and conditions around the world (0). global developments using monthly, on-line, Correspondence to: Dr R. Brugge, Centre for Global Atmospheric Modelling, Department of Meteorology, University of Reading, PO Box 243, 2 Earley Gate, Reading, Berkshire RG6 6BB. summaries* Perhaps the known Of these is the Climate Diagnostics Bulletin (M) from the Climate Prediction Cen-