What does becoming mean in a TAF?

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Tags

1. #frame
2. #permanent
3. #becmg
4. #certain
5. #which
6. #conditions
7. #guess
8. #quick
9. #during
10. #stands
11. #different
12. #weather
13. #becoming
14. #change
15. #minutes
16. #place
17. #prevailing
18. #denotes