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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
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
AVHRR 10.8µm
Fog
Fog
AVHRR 3.7µm
SEVIRI 10.8 µm
Fog
SEVIRI 3.9µm
Fog
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
SEVIRI 1.6, 0.8, 0.6 µm combination29 May 2004 1345UTC
SEVIRI 1.6, 0.8, 0.6 µm combination29 May 2004 1400UTC
SEVIRI 1.6, 0.8, 0.6 µm combination29 May 2004 1430UTC
SEVIRI 1.6, 0.8, 0.6 µm combination29 May 2004 1500UTC
SEVIRI 1.6, 0.8, 0.6 µm combination29 May 2004 1515UTC
SEVIRI 1.6, 0.8, 0.6 µm combination29 May 2004 1530UTC
SEVIRI 1.6, 0.8, 0.6 µm combination29 May 2004 1545UTC
SEVIRI 1.6, 0.8, 0.6 µm combination29 May 2004 1600UTC