weather map

n.
A map or chart depicting the meteorological conditions over a specific geographic area at a specific time.

A map or a series of maps that is used to depict the evolution and life cycle of atmospheric phenomena at selected times at the surface and in the free atmosphere. Weather maps are used for the analysis and display of in-place observational measurements and computer-generated analysis and forecast fields derived from weather and climate prediction models by research and operational meteorologists, government research laboratories, and commercial firms. Similar analyses derived from sophisticated computer forecast models are displayed in map form for forecast periods of 10–14 days in advance to provide guidance for human weather forecasters. See also Meteorological instrumentation; Weather observations.

Rapid advances in computer technology and visualization techniques, as well as the continued explosive growth of the Internet distribution of global weather observations, satellite and radar imagery, and model analysis and forecast fields, have revolutionized how weather, climate, and forecast data and information can be conveyed to both the general public and sophisticated users in the public and commercial sectors. People and organizations with access to the Internet can access weather and climate information in a variety of digital or map forms in support of a wind range of professional and personal activities. See also Climatology; Meteorological satellites; Meteorology; Radar meteorology; Weather forecasting and prediction.

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A map showing the weather patterns throughout a given region.

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The noun has one meaning:

Meaning #1: a map showing the principal meteorological elements at a given time and over an extended region
  Synonym: weather chart

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