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 wrong type of snow The "wrong kind of/type of" part of the phrase has itself been shown to exemplify semantic change, having undergone a process of grammaticalization to move from an impartial description of weather conditions to become a politically loaded signifier of failure. The wrong type of snow "The wrong type of snow" or "the wrong kind of snow" is a phrase coined by the British media in 1991 after severe weather caused disruption to many of British Rail's services. A British Rail press release implied that management and its engineering staff were unaware of different types of snow. Henceforth in the United