This 2 to 2.5 hour self-paced course makes use of text, interactive graphics, case-studies and activities to introduce the basic concepts of impact-based forecast warning systems. After completing this course students will be better equipped to help their organization advance an impact-based approach in hydro-meteorological services, disaster risk reduction and related areas. (Please note, in order to complete the modules in this course, you must allow pop-up windows from this site in your browser.)