This report is a joint product of the International Research Institute for Climate and Society (IRI) at Columbia University and NASA (as the COMPAS project), and the United Nations Development Programme Disaster Risk Management Programme in Cox’s Bazar, Bangladesh. The report presents lessons learnt on the use of climate and weather-related risk information in decision-making, and draws on the experiences of regular humanitarian staff directly involved in coordinating response to the heavy monsoon rains during the first two weeks of July 2019.