File:2007-07-21 500-Millibar Height Contour Map NOAA.png
![File:2007-07-21 500-Millibar Height Contour Map NOAA.png](https://upload.wikimedia.org/wikipedia/commons/thumb/2/28/2007-07-21_500-Millibar_Height_Contour_Map_NOAA.png/800px-2007-07-21_500-Millibar_Height_Contour_Map_NOAA.png?20130809101322)
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