Weather map motion. Two-dimensional streamlines based on wind speeds at various levels show areas of convergence and divergence in the wind field, which are helpful in determining the location of features within the wind pattern. A popular type of surface weather map is the surface weather analysis, which plots isobars to depict areas of high pressure and low pressure. Cloud codes are translated into symbols and plotted on these maps along with other meteorological data that are included in synoptic reports sent by professionally trained observers. The use of weather charts in a modern sense began in the middle portion of the
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