ANASYG/PRESYG Météo-France's new graphical summary of the synoptic situation

Année de publication

2002

Météo-France is preparing the implementation of a revised graphical <br>summary of the synoptic situation. This graphical product has been <br>developed since 1993 as, as far as possible, an extension of the <br>existing framework published by WMO. Graphics remain the best way to <br>convey rapidly a lot of information. However, the existing graphical <br>language for meteorology has seldom changed over the years, while our <br>dynamical understanding has improved. Its current use is in fact poorer <br>than the one allowed by the WMO reference definition. In an attempt to <br>overcome these drawbacks, a richer graphical language is proposed. Its <br>goal is to show and, often, to explain areas of synoptic weather <br>activity in the initial spirit of the Norwegian method, since it has <br>been so successful in shaping modern operational meteorology. However, <br>it takes into account the present understanding of cyclogenesis and <br>large-scale dynamics: the actual and potential baroclinic interactions <br>replace the polar front concept. Dynamical meteorology also provides <br>rather precise guidance for structuring and preparing the summary. The <br>proposed code is described and explained. Examples are shown, with most <br>cases taken from the recent FASTEX (Fronts and Atlantic Storm-Track <br>Experiment) project. <br>Copyright © 2002 Royal Meteorological Society</div>

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