The September 2018 earthquake, tsunami, and liquefaction in Central Sulawesi-the deadliest natural disaster to hit Indonesia since the 2004 Aceh tsunami-exposed challenges in accessing real-time data on what assistance, how much assistance, and where immediate assistance is needed for emergency relief, and the subsequent recovery and reconstruction phases. In response, the World Bank developed a Welfare Tracking in the Aftermath of Crisis (WelTrAC) tool, which employs a mixture of panel household survey data and remote-sensed satellite imagery data to integrate micro and macro levels of disaster impact and recovery assessments, and presents the updated findings regularly on an interactive web-based monitoring dashboard. WelTrAC aims to fill the information gaps on the dynamics of welfare and living conditions of disaster-affected victims during the period following a disaster. Such information is crucial in strengthening the Government's ability to implement effective disaster response strategies for rapid and sustainable recovery.