How do ATC controllers obtain QNH reading ? Does QNH reading being affected during bad weather?

Shared by Cari:
We know that the ATC provides QNH to pilots, but how exactly the ATC recieves QNH information in the first place? ( through a system? a device?)
We know that the ATC provides QNH to pilots, but how exactly the ATC recieves QNH information in the first place? ( through a system? a device?)
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