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Channel 13: The 'Clean' Infrared band - 10.3 µm (micrometers).
This channel is considered 'clean' because it is less sensitive than other infrared window channels to water vapor. Because of this, when compared to channel 11, it can see through some clouds to view ice. This helps to improve corrections to atmospheric moisture and is useful for the estimation of cloud particle sizes. Channel 13 will be used in many composite and band differences views.
GOES-West Channel Description courtesy of National Oceanic Atmospheric Administration (NOAA)