Air mass - what does it mean?
We often talk about air mass but what does it mean? The origin of air masses plays a key part in determining what type of weather we get.
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Unseasonably wet for parts of India
4th December 2017 Last updated at 12:54
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It's the dry season but parts of Mumbai could see up to 150mm of rain from Cyclone Ockhi, whilst in the Bay of Bengal another cyclone could form this week. Stav Danaos takes a look.
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