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Save the icon, visualise it and drop the data with their visdefs in again. Go through the animation steps and look at the Frames tab in the Display Window to see what has happened. Now the fields will be overlaid only if their valid date and time match.
Metview's overlay rules
To summarise, Metview's overlay rules can be described like this:
| Info | ||
|---|---|---|
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| Multiple data contained in a single icon or file (data unit) are never overlaid. |
In practice, this means that a GRIB file with 5 fields is visualised as 5 separate plots which you can scroll through.
If you wish to overlay data, then you must provide separate data icons for each 'layer'. Then we are subject to Rule 2:
| Info | ||
|---|---|---|
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| Multiple data provided in several data icons are overlaid according to the overlay setting in the current view. |