Foehn wind there is no precipitation, implies there must be other mechanisms. 2) Isentropic draw-down (the draw-down of warmer, drier air from aloft): When the approaching winds are insufficiently strong to propel the low-level air up and over the mountain barrier, the airflow is said to be 'blocked' by the mountain and only air higher up near mountain-top level is able to pass over and down the lee slopes as foehn winds. These higher source regions provide foehn air that becomes warmer and drier on the leeside after it is compressed with descent due to the increase in pressure towards the surface.
The Weather Network introduced new local weather products including an hourly forecast for the next 12 hours in 2006, long term precipitation forecasts in 2008 and improved satellite and radar maps in 2009. In 2009, The Weather Network was granted 9(1)("h") must-carry status by the CRTC, under the condition that Pelmorex develop a "national aggregator and distributor" of localized emergency alert messages. In early 2013, The Weather Network launched regional feeds, currently for Alberta and the Maritime provinces. Each feed features its own regional forecasts, weather stories, and where available, traffic information was provided by Beat the Traffic. On December 8, 2014, The