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About This Map
Temperature is the temperature at a given level of the atmosphere at a given moment. Temperature change is the change in temperature over a given time period. Temperature anomaly is the departure of the temperature from average. On our weather maps, temperature is given in degrees Celsius or degrees Fahrenheit. Geopotential height is the altitude at which the air is at a given pressure at a given moment. When meteorologists mention "upper-level low pressure systems", they are referring to low geopotential heights, usually at the 500mb level. Low geopotential heights are often associated with storm systems and cold air. Geopotential height anomaly is the departure of the geopotential height from average at a given level. On our weather maps, geopotential height and geopotential height anomaly are given in decameters. Wind is the sustained wind speed and direction at a given level of the atmosphere at a given moment. Wind gust is the speed of wind gusts at a given moment. On our weather maps, wind speed and wind gust are given in knots or miles per hour.
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