World Weather Research Programme (WWRP)
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Year of Tropical Convection (YOTC)

A joint project of








Research targeted to reduce common barriers to predictions for both weather and climate has the potential to have significant payoffs to society, the economy and the environment. The treatment of tropical convection and its two-way interaction with the planetary circulation within numerical models has been identified as one such common barrier to prediction by the World Climate Research Programme (WCRP) and the THORPEX programme of the WMO's World Weather Research Programme - THORPEX. Improvements in this area would advance predictive skill over a broad range of time scales ranging from high-impact weather (e.g, flooding, tropical cyclones) through the intermediate time scales of monsoons, El Nino and seasonal trends to projections of regional climate and climate change.

The Year of Tropical Convection (YOTC) is a coordinated effort by the climate and weather research communities to advance knowledge and improve the prediction of tropical convection and its two-way interaction with the planetary circulation. YOTC exploits the vast amounts of operational analyses and forecasts, existing and emerging observations, including the revolution in satellite remote sensing, and the expanding computational resources that foster the development of new, high resolution modeling frameworks.



On 1 August 2008, the YOTC program began its coordinated observing, modeling and forecasting effort including the collection of the high resolution deterministic analyses and predictions. The inaugural activities include, for each day of the year, archiving of the ECMWF T799 (~25 km resolution) prediction products including i) global anaysis at 6 hr intervals, ii) one 10-day forecast, iii) extra diabatic fields every 6 h for the first five days of the forecast.

The YOTC Science Plan is now available and comments are encouraged.


For more information see the YOTC Home page on the WMO Research Department


YOTC Science Planning Group Critical components

Mitch Moncreiff, affliation

Duane Wailser, affiliation


  • A-TRAIN - The A-Train Satellite formation consists of six satellites flying in close proximity in a near future



  • ECMWF forecasts and analysis


  • NOAA-NCEP-EMC Global forecast model


  • Global Ocean Observing System


  • Asian Monsoon Years


  • T-PARC


  • The planned GPM - Global Precipitation Measurement
Meetings Research Focii
  • YOTC planning meeting (Washington DC, USA, 13-14 November 2007)

  • International Workshop on the Organization and Maintenance of Tropical Convection and the Madden Juilan Oscillation (Trieste, Italy, March 2006)
  • Diurnal cycle of convection


  • Madden-Julian Oscillation (MJO) Convectively Coupled Waves (CCEW)

  • Easterly Waves and Tropical Cyclones


  • Monsoons
Relevant scientific publications  
YOTC Science Plan  






































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