example of fog over northern europe 24 feb 2004; a winter case, fog over cold snow surface 29 may...
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![Page 1: Example of Fog over Northern Europe 24 Feb 2004; a winter case, fog over cold snow surface 29 May 2004; fog over sea drifting ashore Pirkko Pylkkö](https://reader035.vdocuments.us/reader035/viewer/2022062809/56649e995503460f94b9bcbd/html5/thumbnails/1.jpg)
Example of Fog over Northern Europe
24 Feb 2004; a winter case, fog over cold 24 Feb 2004; a winter case, fog over cold snow surfacesnow surface
29 May 2004; fog over sea drifting ashore29 May 2004; fog over sea drifting ashore
Pirkko PylkköFinnish Meteorological Institute
(See alsowww.knmi.nl/satrep Satrep Manual)
1/30.6.2004
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Winter case; 24 Feb 2004
Fog over snow surface:•Fog top warmer than surrounding snow surface => in IR channels fog darker than surface•In the winter mostly nighttime or twilight conditions•10.8 and 12µm channels better than 3.9µm for fog above cold snow at night•Next pages: First AVHRR 10.8 and 3.8µm images and then same channels from SEVIRI (date 24 Feb 2004 0130UTC)
2/30.6.2004
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AVHRR 10.8µm
Fog
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Fog
AVHRR 3.7µm
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SEVIRI 10.8 µm
Fog
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SEVIRI 3.9µm
Fog
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7/30.6.2004
Fog over sea; 29 May 2004•Daytime fog can be seen also in visible channels very well•SEVIRI HRV can be of assistance also in the north•Animating SEVIRI images makes fog more easy to recognize•Following pages: SEVIRI 1.6, 0.8 and 0.6 µm
AVHRR channels 0.6, 0.8, 10.8µm
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SEVIRI 1.6, 0.8, 0.6 µm combination29 May 2004 1345UTC
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SEVIRI 1.6, 0.8, 0.6 µm combination29 May 2004 1400UTC
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SEVIRI 1.6, 0.8, 0.6 µm combination29 May 2004 1430UTC
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SEVIRI 1.6, 0.8, 0.6 µm combination29 May 2004 1500UTC
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SEVIRI 1.6, 0.8, 0.6 µm combination29 May 2004 1515UTC
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SEVIRI 1.6, 0.8, 0.6 µm combination29 May 2004 1530UTC
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SEVIRI 1.6, 0.8, 0.6 µm combination29 May 2004 1545UTC
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SEVIRI 1.6, 0.8, 0.6 µm combination29 May 2004 1600UTC