Franco Molteni, staff scientist with the ICTP Physics of Weather and Climate Group, has received the Buchan Prize of the Royal Meteorological Society (RMS) for 2002. Molteni will share the prize with Roberto Buizza, researcher with the European Centre for Medium-Range Weather Forecasting, Reading, UK. The prize is awarded to RMS fellows who, in the past 5 years, have published articles in the Quarterly Journal and The International Journal of Climatology or Atmospheric Science Letters deemed to be the most important and original contributions to the field. Molteni and Buizza's most noteworthy contributions have centered on the so-called ensemble prediction, a methodology that aims to quantify uncertainties in forecasts that are inherent in numerical simulations.