Changing formats isn't easy - there are often massive collections of data and complex tools (like numerical forecasting models) that need to be updated or reworked to handle new formats. Not everyone can do that (e.g. for financial reasons, or organisational expertise reasons, or some programmatic reason like there is already another upgrade going on) at the same time.
So you can expect to need to handle lots of formats for a long time to come.
If you have options and need to exchange data, I'd start with NetCDF, mainly because it has a lot of pretty good tools.
Depending on how broadly you define "Meteorlogical Data", but you could also consider that IOOS and CIOOS use a mix of OGC SOS and OPeNDAP.