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This shows the past 3 hours of images of the United States, one image per hour from a NOAA satellite. These images are taken using a wavelength sensitive to the content of water vapor in the atmosphere. Bright and colored areas indicate high water vapor (moisture) content (colored and white areas indicate the presence of both high moisture content and/or ice crystals). Black and brown areas indicate little or no moisture present. WV imagery is useful for both determining locations of moisture and atmospheric circulations.
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