September 5, 1999 13:45 UTC South of the North Sea. On the visible image, a clouds strip (1) appears along England. The sky is clear elsewhere over the sea, except a small crescent of clouds (2). On the infrared image, the clouds strip (3) along England is only slightly clearer than the sea. The temperature of the top of these clouds is not much colder than the temperature of the sea. That means that they are low clouds, probably stratus or fog. On the other hand, the small crescent of clouds (4) appears definitely whiter than the sea, they are thus higher clouds. |
