Masas de aire
A widespread body of air, the properties of which can be identified as: (a) having been established while that air was situated over a particular region of the Earth's surface (airmass source region) and (b) undergoing specific modifications while in transit away from the source region. An air mass is often defined as a widespread body of air that is approximately homogeneous in its horizontal extent, particularly with reference to temperature and moisture distribution; in addition, the vertical temperature and moisture variations are approximately the same over its horizontal extent.
El pronóstico del tiempo explicó que las masas de aire frío y seco de Canadá se estaban moviendo hacia el sur, causando una caída de la temperatura y cielos despejados para el fin de semana.
