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Detection and nowcasting of fog

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1 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

2 ch09

3 Ch04; not inverted, clouds are dark

4 Difference green: high probability for fog

5 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

6 Difference 02 UTC

7 Difference 04 - 09 03 UTC Fog develops and/or becomes denser
Fog dissipates

8 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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