A linearized model is used to examine the dynamical effects of a mesoscale temperature perturbation in the lower troposphere. The perturbation is a result of nonuniform cooling of the environment by melting snow. An organized mesoscale thermal circulation develops, with strong vertical motions in the interior, outflow at low levels, and a return flow at upper levels. This circulation is similar to a sea breeze circulation but is forced by an elevated horizontal temperature gradient. A possible application to the problem of observed enhanced precipitation regions near a rain/snow boundary is considered.