Foehn wind 3) Mechanical mixing: When river water passes over rocks, turbulence is generated in the form of rapids, and white water reveals the turbulent mixing of the water with the air above. Similarly, as air passes over mountains, turbulence occurs and the atmosphere is mixed in the vertical. This mixing generally leads to a downward warming and upward moistening of the cross-mountain airflow, and consequently to warmer, drier foehn winds in the valleys downwind. 4) Radiative warming: Dry foehn conditions are responsible for the occurrence of rain shadows in the lee of mountains, where clear, sunny conditions prevail. This often leads
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