When closing the channel for LN - how to calculate the fee for the blockchain transaction?

When closing the channel for LN - how to calculate the fee for the blockchain transaction?

To be clear: Following is not about fees in Lightning Network. Following is about fees on blockchain for transaction which closes the channel in LN.

Channel closing transaction can be created months before broadcasting to blockchain network. How the fee for the blockchain transaction is calculated without knowing the (far) future situation in mempool?

Is replace-by-fee possible for LN's closing transaction? There are different types of closing transaction — maybe answer is different for each type of closing transaction.

Is the fee calculation related to current situation in mempool? I found some calculations here, but I didn't found any relation to dynamically changing situation in mempool.

http://ift.tt/2C1ozID

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