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Fog over Northern Europe

24 Feb 2004; a winter case, fog over cold snow surface. 29 May 2004; fog over sea drifting ... Fog top warmer than surrounding snow surface => in IR channels fog ...

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Fog over Northern Europe

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    Slide 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 Finnish Meteorological Institute (See alsowww.knmi.nl/satrep Satrep Manual) 1/30.6.2004

    Slide 2: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 AVHRR 3.7µm SEVIRI 10.8 µm Fog SEVIRI 3.9µm Fog 7/30.6.2004

    Slide 7: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 combination 29 May 2004 1345UTC SEVIRI 1.6, 0.8, 0.6 µm combination 29 May 2004 1400UTC SEVIRI 1.6, 0.8, 0.6 µm combination 29 May 2004 1430UTC SEVIRI 1.6, 0.8, 0.6 µm combination 29 May 2004 1500UTC SEVIRI 1.6, 0.8, 0.6 µm combination 29 May 2004 1515UTC SEVIRI 1.6, 0.8, 0.6 µm combination 29 May 2004 1530UTC SEVIRI 1.6, 0.8, 0.6 µm combination 29 May 2004 1545UTC SEVIRI 1.6, 0.8, 0.6 µm combination 29 May 2004 1600UTC
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