outflow boundary mesoscale outflow boundary (a.k.a. gust front Outflow boundary outflow boundary outflow boundary outflow boundary http://en.wikipedia.org/wiki/Outflow_boundary outflow gust front sudden temperature drops http://en.wikipedia.org/wiki/Outflow_boundary gust fronts Outflow boundary outflow outflow boundary gust front gust front Learning about gust fronts English English outflow gust front gust front English outflow English outflow outflow boundary outflow boundary outflow http://en.wikipedia.org/wiki/Outflow_boundary English outflow boundary outflow boundary Outflow boundary Wikipedia English outflow