The frequentist and classical models of probability provide students with different lenses through which they can view probability. Prior research showed that students may bridge these two lenses through instructional designs that begin with a clear connection between the two, such as coin tossing. Considering that this connection is not always clear in our life experiences, we aimed to examine how an instructional design that begins with a scientific scenario that does not naturally connect to theoretical probability, such as the weather, may support students' bridging of these two models. In this paper, we present data from a design experiment in a sixth-grade classroom to discuss how students' shifts of reasoning as they engaged with such a design supported their construction of bridges between the two probability models. [For the complete proceedings, see ED630210.]