Weather Lab is an online interactive tool, or app, that helps students visualize how North America’s weather is formed in the Spring. The app models the interactions between various air masses and ocean currents and describes probable weather outcomes. Students choose an ocean current and two air masses and the lab describes the characteristics of each. Students then predict the resulting weather conditions from a list of possibilities. When they choose the correct answer, the lab explains the interactions and possible weather. Usually links are provided that display a video clip or a satellite image of actual air masses in motion.