| a map or chart showing weather conditions over a wide area at a particular time, compiled from simultaneous observations at different places. |
| weather map n. A map or chart depicting the meteorological conditions over a specific geographic area at a specific time. |
weather map
any map or chart that shows the meteorological elements at a given time over an extended area. The earliest weather charts were made well before 1835 by collecting synchronous weather reports by mail. The first telegraphic collection of synoptic meteorological reports and their mapping for forecasting was accomplished by Urbain-J.-J. Le Verrier during the mid-1800s.
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