Clarifications
Infrared satellite images can be viewed 24 hours per day, since it is the temperature that is being measured. Clouds appear white in the image. The brightness of the cloud depends on the temperature of the cloud. Higher clouds, which are colder, appear bright white. Lower clouds, which are warmer, appear gray. Very low clouds, such as stratus and fog are sometimes difficult to see in IR imagery, as the temperature is very close to the nearby land temperature. Land and oceans appear gray or black in the image. The warmer the temperature of the land or water, the darker the feature looks on the image. Land temperature varies between night and day, and this can be seen in IR satellite images taken at night versus during the day. Lightning strikes include cloud to ground strikes as well as strikes within and between clouds for the previous 30 minutes. Selected airport locations are depicted using the 4 letter ICAO identifier at the location.
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