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Detection and nowcasting of fog
An operational nowcasting modul Ch09: 10.8 Ch04: 3.9 difference channel: Differences for difference channel between to points of time: measure for development and dissipation of fog Contact person: Veronika Zwatz-Meise Version July 2004
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ch09
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Ch04; not inverted, clouds are dark
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Difference green: high probability for fog
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Difference UTC blue: automatic diagnosis of areas colder than -7o green: areas with „fog development“ during the last hour red: areas with „fog disspation“ during the last hour
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Difference 02 UTC
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Difference 04 - 09 03 UTC Fog develops and/or becomes denser
Fog dissipates
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Computation of differences between two points of time
Two possible interpretations: Fog fields without moving upper level clouds: Fog development and/or dissipation Fog fields with moving/crossing upper level cloud: New detection and/or hiding of fog through crossing upper level cloud fields this is especially true for the boundary areas between fog and high cloud
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