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Higher-level water clouds can also yield the same signature as fog and stratus at night. There are a number of other tools available to assist in the positive identification of fog. They include knowledge of local terrain and the anticipated fog formation mechanisms, climatology, and confirming surface observations. In addition, animated satellite imagery can delineate rapidly moving water clouds and fog. Furthermore, the 10.7 micron channel brightness temperatures are useful since fog will be at the same temperature or warmer than the ground, while upper-level clouds will be colder than the ground.
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