If you want different set of images for day and different for night:
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create another set of bitmap fonts (you can name them Nightfonts or anything else)
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upload night-weather images (the same way we did in the guide)
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after you’ve created another set of weather fonts
click on opacity Tags
set opacity / enter formula:
for night weather images / night set of fonts:
0 + [WTHR_IS_DAY]==1?0:100
for day weather images / day set of fonts:
0 + [WTHR_IS_DAY]==1?100:0